Home

Warning

1. AGIDO STRENG AGENT HAZARDS BOLYTMERTIZATIUN WILL HT TUO AWGOID DUNTAMINATIUCN DOE ETHIO amp HEALY THEESHOLG LIMIT VALHE ERIT ESTABLISHED PRIMARY GE EEJ UNLIKELY DEAL IMEJTE TES JETN INHALATILHI TNLIEELYT THIS EBZHWHIUT IN SOLID TABLET FORM HUNLTEELY TO EEEHENT A HAZARD IN TO THE HEIN OF EYES HOWEVER IF TABLETS AND IMST CREATED THE MAY HE IRRITATING TO THE EYE AND IERTTATINU THE HEIN IE Id EROLUNIGED WAL INGESITICH MAY BE HAEMFIHT EMERILENUT AND AID EYES ABD JELE IF TAHLEI DUST GETS IH EYES ON ELUH WITH OF WATER IE IERITATIUHE PERSISTS GET MEDICAL ATTENTIUCHE IBGE SAT Ito IF TAHLETS ARF HHINE PROMPTLY HIANTITYT WATER AWVOID ALCOHOL GET MEDICAL ATTENTICH IMMEDIATELY EGTE PHYSICIAN FREMARLE DAMAGE MAY IHE TSE OF GASTRIC LAVAGE MEASURED RESPIRATORY DEEEEHSIUN AND CHULILLA MAY HE NEEDED FEHEFHERE GAME AJ AFTIE DEAL IN HIE I
2. 201 Prism 2 User Manual ARE AGHTIHNG MEASURES POHT CPC TOF LOWER 15 05 inp ar FLMMAELITC 3 REACTWITY 1 er En dur ee be Haie PAA ARE Gees ir Roms re RATEN ern Mekka re I er we en er ACODENTA RELEASE MEASURES en ee er Re Fear D a een uma und mon ud rnc pon EEL m men nd d 83 ERE COR perd hom dr wi ind D pd md rm pode hune Sf T DEZ mm AND STORAGE HORE Deren ad dy place Fam nri me md Boe Do m tba h ding ad 01 mh d cima 2 npud Mh uh ven or ch ng hdd oe pese ced aerate el re La La Em Ee gba n bel ee addis k oF uim oem deae bland odd cm d fe led wale cnni EXPOSURE CONTROLSIPERSONAL PROTECTION ccm a aioe aper
3. 9 i Fig 87 Version 1 0 Prism 2 User Manual Example Dive This is an example of the displays that might be seen on a dive This example shows a com plicated dive with multiple Closed Circuit CC gases and multiple Open Circuit bail out gases normal single gas CC or OC dive wouldn t have any button pushes at all so there isn t much to show The first step is to calibrate Fig 88 Since we are on the surface and not diving MENU will bring up Turn Off then Calibrate Once the loop is flushed with oxygen SELECT will bring up the confirmation display Fig 89 and another SELECT will calibrate Fig 90 Fig 88 Fig 89 Fig 90 Next we check the closed circuit gases that we have programmed Entering the gas selection function by pressing SELECT with the Select Gas menu item showing Fig 91 will display the first CC gas that is available Fig 92 MENU will increment to the next gas available Another MENU takes us back to the Select Gas menu item Those are the only two gases configured We SELECT gas number 2 Trimix 10 50 Fig 93 The system will use both of these gases for our dive when calculating the TTS It assumes a diluent switch at a PPO of 1 0 That means that it will assume that you have switched to an air diluent at 124 feet This is only for TTS The computer will always use the currently select ed gas for tissue loading calculations Then we switch to open circu
4. a sensor be contaminated by carbon dioxide C0 gas reducing the sensor life Exposure of the sensor with its base electrolyte to carbon dioxide CO gas or acid gases will produce crystal like deposits on the cathode which reduces the surface area of the cathode and the corresponding signal outputs This effect is cumulative cannot be reversed and can dramatically reduce the expected sensor life This means that attempting to Push the scrubber beyond its factory stated duration or breathing into a loop without active scrubber material installed will shorten the life of your O sensor Can the oxygen sensor be damaged if dropped or if the rebreather is dropped Absolutely Sensors are fragile and can be damaged in a number of ways Dropping a sensor by itself or while mounted in the rebreather can result in a broken wires b broken electrical connections c dislodging the anode and either breaking a connection or creating an internal short as the loose anode comes in contact with the cathode connection If the motion stop force is applied onto the sensor face the liquid electrolyte can be forced onto the Teflon membrane stretching the material and destroying the sensor Testing has shown that dropping a sensor one time from 3ft 1m onto a carpeted concrete slab can result in an immediate 25 100 reduction in signal output Types of forces known to cause sensor damage while housed in a rebreather include but are not lim
5. pr cr per x 10 27 28 Calibrate oxygen sensors Assembly disassembly cleaning examining Proper scrubber packing Evaluating systems operations In water bubble check Controlled descent DSV BOV shut down Mask clearing Remove amp replace DSV BOV Emergency bailout On board gas Manual addition of diluent Manual addition of oxygen Minimum loop volume OPV operation Manually maintain setpoint Stationary Manually maintain setpoint Descent Neutral buoyancy Manually maintain setpoint Swimming Manually maintain setpoint Ascent Clear water from hose Diving with off board bailout Off board bailout assist of another diver Valve shutoff drills Disconnecting quick disconnects Changing computer setpoints underwater Bailing out the computer to OC underwater Working with Prism2 Checklists e Optional Skills Deploying an SMB Using a drysuit with your rebreather STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT STUDENT INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INS
6. Doed wil alin ven 202 p Gages MOECEENE Homid May of n a od n onm nn Mh in of poly i prii gon ch ndi inia m ng a bonum dno parom dm Puis kioke d pate ad mel as mar panel Beer od ovn denial aper dedi oF mmn FURTHER PCR Hom dim d um rer Piel Reh Bastler u Er bars od om many bad b TION Daly Plau Fam of gallon Ho wil in camo rm plur s d dan malin nian Ta hipan o mando Una gi mier haly mhm Vul or pegado of 18 OTHER EMMROHMEHTML DAXA br RS CL SOY VO BGE 29 Cor RR AB Da Ca Oe De Bo indie rl en ED SAS Py Rame Poe qr 12200 Thaha Court Prey CA GAR US RA TEL PA Emi CSS E ww oaig oom Version 1 0 Prism 2 User Manual ini EROUAUIVAL Safety Data Sheet Crane House Molly Lane Wokingham Berkshire Fics41 2FLZ _ _ 44 0 11
7. NN Battery rR rR Bucket sealing O Rings rR I en OR T BucketLacnes I DO owens s S Diuent enge IgG III wm s rk ozmen ooo ozGesesros s DwemiPHoes amp Qo Rn DuemHPHose _ SR o ozPresuegage I s Diuent Pressure gauge I m 5 OggenSoenid SR s Solenoid Chamber Pressure Reliervane OOOO OO 2 10 0 01 01 0 170 Version 1 0 Prism 2 User Manual Battery Compartment Housing The wiring harness in the battery compartment is attached to a male Molex connector at the base of the battery compartment stack To remove the harness gently pull on the wiring harness until the Molex connector comes out The Molex connector at the base of the battery stack is potted in place and is not a user replaceable part If this part is damaged due to compartment flooding or mishandling you will need to bring the head in to your local Hollis dealer for replacement N If the battery compartment ever floods the batteries inside the compartment will leach acids and gasses into the compartment which can cause the Pressure Relief Valve to vent the gasses and liquids so you must take precautions against being exposed to these toxic substances There is also a height
8. Pour the absorbent slowly from about 12 above the basket allowing the wind to carry off any dust The absorbent should be granular and not produce much dust while pouring Fig 249 If the material looks crushed or is exceptionally dusty don t use it as that can be an indication that the absorbent has been mishandled and may not scrub CO properly during a dive Continue pouring until the absorbent reaches the first horizontal brace on the basket Fig 250 Unless you were exceedingly careful some material will have fallen onto the paper around the basket Lift the basket off the paper and pour the granules from the paper into the basket If the material on the paper is mostly dust dispose of it carefully rather than pouring it into the basket With the basket on the towel covered ground gently begin tapping the basket where the vertical and horizontal braces meet Fig 251 This will begin to settle the granules in the basket The trick is to tap hard enough on the cross braces that the vibrations cause the material to settle but not so hard that the granules jump around Make sure you do not tap the mesh as that will only displace the material from the sides While tapping the cross braces rotate the basket so you tap all sides of the basket Spend at least a minute tapping the basket sides You may notice that the absorbent level drops as the granules settle 86 Version 1 0 Prism 2 User Manual Repeat the fill
9. ede Enie B Eni E ric WR e Be Ice el ec pt Ce ere Terre Prodi rn br pcm pda Donkin pelo pd n car rod Tio habh uen u mui Appl a died iml enia doin bcd oai Ir For er cd era pr Doi T e vall u nimius und applica on az nalla enira cun h mre 65 or Galen d Prod Er pod on dd prha ine wv ua br MS amp khai Er genre prm esis Cond pim m e dr nee bel umma u he ard mind mr opa dien cum of qiia kan wank well lew ima bakes sb Uma ms bina m reed uicem ud vim ml uris Eum d Da 41 AN or pr poo mn VL EINEN BEST d p Version 1 0 Fresse PE Eds mecs men Gee Air en m cui 15 nd prn malui bee Faccom bh wie i N apum md dean dag upy a arid d Peed br
10. the Secondary go to the Dive Log menu and select Upload Log Fig 173 174 Fig 173 Fig 174 Version 1 0 65 Prism 2 User Manual The Secondary Display screen will switch from Initializing Fig 175 to Wait PC Fig 176 which will have a countdown Fig 175 Fig 176 Now go back to the Shearwater Desktop Fig 177 Click start from the open Update Firm ware Box Fig 178 or Download Log Fig 179 The PC will then connect to the Second ary and send the new firmware Predator ViS aes Fig 177 Fig 178 Fig 179 The Secondary Display screen will give percentile updates of receiving the firmware Fig 180 then the PC will read Firmware successfully sent to the computer Fig 181 Fig 180 Fig 181 66 Version 1 0 Prism 2 User Manual The Secondary Display will now Decrypt Fig 182 which will take approximately 4 minutes Warning Do not remove the battery during this time After decryption the Secondary will process which will take an additional 4 minutes Fig 183 Fig 182 Fig 183 The screen upon completion of processing will read Tissues Cleared which must be con firmed The screen will then read Upgrade Reset which also must be confirmed The Secondary Display now has the most up to date firmware Version 1 0 67 Prism 2 User Manual 68 System Setup Fig 184 System Setup contains configuration settings that are only set be tween dive
11. Fig 16 BOV Bail Out Valve The bail out valve Fig 17 is a unique 3 position neutrally buoyant loop shutdown valve with an in line second stage for single action bail out to open circuit When the lever is in the top position the valve is fully closed to avoid free flows of air from the diluent supply The second position is closed circuit and the third position is open circuit See exploded diagram Fig 19 on facing page Fig 17 Exhalation Hose and hardware The Exhalation hose is a 15 X 172 fixed length rubber breathing hose The mounting hardware on each end are held in place by 2 Oeteker clamps There is no mushroom valve in the exhalation hose 8 Version 1 0 Prism 2 User Manual Fig 18 Fig 19 Version 1 0 9 Prism 2 User Manual Battery Compartment cover The battery compartment cover Fig 20 is made of glass reinforced ABS The cap utilizes two O rings for redundant water tightness a radial seal on the lip of the cap and a compression seal on the top of the battery compartment housing There is a pressure relief valve built into the top of the cover to vent excess pressure should the battery compartment flood If the pressure release valve red were ever to actuate you would need to replace it prior to immersing the unit see maintenance section Fig 20 Battery compartment The battery compartment Fig 21 holds two sets of batteries two 9V alkaline batteries wired in parallel which
12. MaxGF 0 85 a et li You can ascend to 90ft when your tissue compartments let off enough pressure at your 100ft stop so that when you reach 90ft your tissue compartments does not exceed 0 40 calculated as MaxGF 0 85 0 85 0 30 90 110 The GF method allows you to ascend by walking that line all the way to the surface Summary If you understood the above explanation then you see why divers say that setting your GF parameters to 10 90 or 10 80 etc helps generate deep stops The low GF of 10 means a stop must be generated when your tissue compartments are only 10 of the way between ambient pressure and B hlmann s M value rather than 30 if you were to set the low GF to 30 Simply the GF line just starts deeper The gradient factor method is a natural extension of B hlmann s tissue compartment model Divers using computers implementing the gradient factor method should understand how modifying their GF parameters would alter the decompression profiles You must consider altering your GF parameters based on dive characteristics your physical condition and your general attitude toward the risk of decompression illness The gradient factor method provides the diver substantial flexibility in controlling their decompression profiles Your responsibility is to choose the factors appropriate for you For more information on gradient factors and M values please refer to Erik Baker s excellent articles Clearing up the confusion ab
13. aed surdi a ER m LZ PERBOMAL PROTEC TNE Fe Paes Felle rare ee cuui agr ar dr Hur gan gage lc nid damig m Um mcd dr od HAB PROTERETIORE War eek uf mand dos i pad CHER Mom mquimd br condam d PRL HAP ran adig onm dm rl PHYSICAL AND CHEMICAL PROPERTIES FOE ma Ul CLO Padi DNE od B5 MELTIME POE BCLS POME RT WPORFRESRNE 12 6 IPC Ai DO ee 1 STABILITY AND REACTIMITY MER REIFEN PERE Dees H canens und ee mm 10 Lu Do ny n iod n3 HAE Hanh el men A dl rud ee veer Does in o sailors egi Cm oor ipi om lo oye Fe er ae TE re en Wi NERA nag 11 INFORMATION PONES CF EE BAM COWTACT or dem of cho u und cam ain Fon p we
14. Getting to know your Prism Schematics amp Design The Gas Path The Prism 2 incorporates an over the shoulder split counterlung design The gas flows through the loop from left to right shoulder as has become a standard in the recreational rebreather market Fig 1 Flle a 27 Version 1 0 3 Prism 2 User Manual Oxygen and the exhalation side of the loop Pure oxygen injection into the system whether manually or electronically is injected into the exhalation side of the breathing loop Fig 2 This design insures that a diver can never inadvertently get a high PO dose of oxygen while diving and that oxygen has plenty of time to properly mix with the loop gas and thereby avoid potentially dangerous O spikes Fig 2 The Over Pressure Valve OPV Fig 3 The OPV acts automatically to protect the user from lung injuries caused by excessive pressure in the breathing loop Being placed on the exhalation counterlung along with the manual oxygen addition valve also insures that should the manual oxygen addition valve Fig 4 ever experience a free flow the free flowing oxygen will exit the system through the OPV before traveling through the loop and significantly raising loop PO This gives the diver time to take corrective action Exhaled gas and any solenoid injected oxygen enter the head at the exhaust plenum just prior to the scrubber basket See O2 addition valve Fig 6 exploded diagram on the foll
15. Matthew Addison The Mentor Prism 2 User Manual Prism 2 Design Team Bob Hollis Chauncey Chapman Art Ferguson Robert Landreth Matthew Addison Peter Readey Prism 2 Manual written by Matthew Addison Bruce Partridge Edited by Jeffrey Bozanic Chauncey Chapman John Conway Gerard Newman Contributors Jeffrey Bozanic Gerard Newman Dr Richard Pyle Sharon Readey Kevin Watts Hollis Prism 2 eCCR User Manual Version 1 0 Document Control number 12 4072 Publish date 03 15 2012 2012 Hollis You may not reproduce this manual in whole or in part without the express written permission of Hollis Version 1 0 Prism 2 User Manual General Safety Statements and WARNINGS No person should breathe from or attempt to use in any way a Hollis Prism 2 rebreather or any component part thereof without first completing an appropriate Hollis Certified user training course Further no Prism 2 diver should use a Hollis Prism 2 without direct Hollis instructor supervision unless they have mastered the proper set up and operation of the Hollis Prism 2 This includes new Prism 2 divers as well as Prism 2 certified divers who have been away from diving for 6 months and would benefit from an instructor led refresher course to regain skills mastery of the Hollis Prism 2 Failure to do so can lead to serious injury or death The Prism 2 rebreather can as with any closed breathing loop circulate breathing gas that may not contain
16. Once you are in the water and ready to go while holding onto a down line slowly deflate your buoyancy device until you submerge the unit a few feet below the surface Your buddy will check for the telltale sign of leaking into the breathing loop a stream of small bubbles Also your buddy will check inside the clear scrubber bucket for any signs of water intrusion While your buddy is doing a full check you should check the mouthpiece hoses and counterlungs 148 Version 1 0 Prism 2 User Manual Initially there may be a small amount of air trapped in the buoyancy device material but they should dissipate quickly Ifthere are a lot of bubbles coming from everywhere give the fabric a few moments to shed the trapped air Sometimes tapping the rebreather on one of its hard bits or shaking the unit will help shed superficial bubbles quickly Warning The one place where a leak could occur and you would not notice initially is the battery compartment If you have a leak in the battery compartment the primary display will stop functioning as will the solenoid It is therefore important that you keep an eye on the primary display before you begin your descent and for the first few minutes of the dive If the display is not lit bail out to open circuit and discontinue the dive immediately Skill 2 Controlled Descent Prior to your initial descent you must verify that the oxygen content in your breathing loop is at your low set point w
17. by the secondary display is considered by the electronics as acceptable for use with the solenoid however beginning dive with a battery voltage of at least 7V is strongly recommended Fig 293 EXT V INT V 8 8 3 4 Fig 294 The computer measures the dynamic voltage of the solenoid batteries which means the voltage is being measured while the solenoid is firing and the batteries are under load This is the most accurate way to verify the actual working capacity of the batteries Using a voltmeter that does not put a load on the battery can give you a higher voltage reading but the measurement will not be nearly as accurate a gauge of actual battery capacity This is why we do not recommend relying on a voltmeter to test the solenoid batteries Field Notes Solenoid Battery For the computer to measure the dynamic load of the solenoid battery the Prism 2 must have a valid calibration stored in memory to allow the solenoid fo fire If when you turn on the secondary display all three sensors display fail the solenoid will not fire and the voltage display for the solenoid battery will show You will not be able to verify the dynamic voltage of the solenoid batteries until the system has been calibrated which will then allow the solenoid to fire 108 Version 1 0 Prism 2 User Manual b LED Primary display battery The LED Primary Display battery is located the battery compartment It is a SAFT 3
18. ed and the display will return to the Low SP menu item Fig 127 If the highest allowable value 1 5 has been passed the value will return to 0 4 Fig 127 High Setpoint Fig 128 The high setpoint function works exactly like the low setpoint func tion Fig 128 54 Version 1 0 Prism 2 User Manual Define Gas Fig 129 The function allows you to set up 5 gases in Closed Circuit and 5 gases in Open Circuit You must be in Open Circuit to edit open circuit gases and you must be in Closed Circuit to edit closed circuit diluents For each gas you can select the percentage of oxygen and helium in the gas Fig 129 Pushing SELECT when Define Gas is displayed presents the function to define gas number 1 Fig 130 Fig 130 Pushing the MENU button will display the next gas Fig 131 Fig 131 Pushing SELECT will allow you to edit the current gas The gas con tents are edited one digit at a time The underline will show you the digit being edited Fig 132 Fig 132 Each push of the MENU button will increment the digit being edited When the digit reaches 9 it will roll over to O Fig 133 Fig 133 Pushing SELECT will lock in the current digit and move on to the next digit Fig 134 Fig 134 Pushing SELECT on the last digit will finish editing that gas and bring you back to the gas number Fig 135 Any gases that have both oxygen and helium set to 00 will not be dis
19. using 6 12 40F 4 4C 1 35slpm CO 40lpm RMV 60fsw 28msw O Fill O amp Diluent cylinders analyze contents label cylinders with name date contents psi bar Dil Contents Pressure psi bar MOD LH Install regulators and hoses H plate system on right head facing up Run all lines under bottom tank strap Install head assembly onto H plate 2 steps 4 button head Allen screws amp SS washers O solenoid line between right side head mount flange amp H plate Tighten hose to solenoid O Install BCD yoke and backplate onto H plate 4 steps 1 long screw on top short screw on bottom Secure with nylon keepers install BCD on plate inflator facing H Plate 1 install yoke harness fastex clips facing BCD 1 install backplate and harness place on washers and tighten butterfly nuts Attach counterlungs to yoke 3 steps insure inhale counterlung is on right side with bladder amp yoke face up 1 fastex buckles in place lineup Velcro parts and compress Install counterlung breathing hoses to head 2 steps clean and lubricate o rings o ring groves and mating surfaces 1 install hose nuts only finger tight Do not over tighten 1 Attach gas supply lines to diluent and oxygen addition valves on counterlungs amp BCD inflator 2 steps 1 longer diluent hose feeds BCD inflator O attach all 3 QD fittings Pull on hoses to make sure they are secure Assemble DSV BOV and
20. 99 and the most conservative is 70 The default is 90 Version 1 0 43 Prism 2 User Manual 44 Pressure Fig 79 The pressure in millibars Two values are shown the surface surf pressure and the current now pressure The current pressure is only shown on the surface i e when not diving The surface pressure is set when the Secondary Display is turned on If the Altitude setting is set to SeaLvl then surface pressure is always 1013 millibars Temperature Fig 80 The current temperature in degrees Fahrenheit when depth in feet or degrees Celsius when depth in meters External Voltage Fig 81 The external voltage of the solenoid battery Internal Voltage Fig 82 The Secondary Display s internal battery voltage Displays in Yellow when the battery is low and needs replacement Displays in Flashing Red when the battery is critically low and must be replaced as soon as possible Millivolts Fig 83 The raw millivolt readings from the O sensors Date and Time Fig 84 In the format mm dd yy 24 hour clock time Serial Number Fig 85 Unique serial number identifier for every Secondary Display Version Fig 86 The version number indicates the features available on the Secondary Display The last two numbers are the firmware version Surface Interval Fig 87 The time in days hours and minutes since the last dive ended Reset when the battery is removed Fig 79 Fig 83
21. _ Pressure Dil Contents Pressure psi bar MOD Record contents and pressures for both gas supplies and the maximum operating depth MOD for the diluent MOD fsw 33 gt MOD msw 10 4 fO 15 Install regulators and hoses on H Plate Install the oxygen regulator and hoses on the right side head facing up by running all the hoses under the tank band straps on the inside of the tank bracket side facing the bucket with the DIN valve facing outward toward where the tank will be installed Install the diluent regulator and hoses on the left side head facing up by running all the hoses under the bottom 118 Version 1 0 Prism 2 User Manual tank band strap on the inside of the tank bracket with the DIN valve facing outward Run the ADV supply hose and pressure gauge under the top tank band but leave the solenoid supply hose loose as you will be running it separately when you install the head assembly in the next step 16 Install head assembly onto H Plate 2 steps a 4 button head Allen screws and SS washers Bolt the head onto the H Plate using the 4 stainless steel button head Allen key button head bolts Make sure to place a nylon washer between the stainless steel bolt and the aluminum H Plate b Run O2 solenoid hose between right side head mount flange amp H plate Tighten hose to solenoid Run the solenoid supply hose in the channel created between the right side head mount fl
22. attention to make sure the wiring is secured so you cannot snag it while moving the unit during cleaning and tear down Drain counterlungs of fluid Your exhale counterlung will have fluid in it which contains both water from your dive environment fresh or salt and saliva and other bio fluids Open the counterlung drain by loosening unscrewing the stainless steel locking collar and push the tip in toward the body of the drain A viscous fluid either clear or slightly milky white will drain from the exhale lung The Inhale lung should have no fluid in it If it does that would indicate a leak somewhere on the inhale side of the loop Do not dive the unit until you have found and repaired the leak Version 1 0 Prism 2 User Manual Remove CL weights Remove any weights you had in the counterlung weight pockets Not having the additional weight in the counterlungs will make them easier to handle Remove weight pockets weights rinse and hang to dry Remove weight pockets if supplied or any other removable weights from the unit Soak the pockets in fresh water then hang to dry 1 Soak complete sealed unit in fresh water for 20 minutes if possible or hose off with fresh water Submerge the rebreather in a fresh water rinse tank if one is available Put the unit in the water and drain all the air from the counterlungs by holding the mouthpiece above water and opening it to let the gas escape from the loop Also d
23. controlled CCR and then onto the multi mode digital PRISM Topaz As a result he has worked with some of the brightest and best in the industry from Stuart Clough at Carmellan Research lain Middlebrook HSM Engineering Dr Bill Hamilton Hamilton Research Rob Palmer Dragerwerks Fullerton Sherwood Carlton Technologies Billy Deans Key West Diver Wings Stocks Ocean Odyssey Hal Watts Barb Lander Dick Long DUI John amp Jean Lamb Vandergraph DDRC All Michael Menduno AquaCorps Steven Stuart Mid Atlantic Research and many others Entwined through all that time was the work right at the start with Bob Hollis and Oceanic Pete in PRISM SCR June 19994 at Diving Diseases Research Center Ft Bovisands UK Getting ready for manned testing scrub ber durations WOB tests and chamber runs to 300ft with independent test subjects The teaming of Pete and Oceanic started in 1992 when he s WOrked as a sub contractor to Carmellan on 5 early Phibian CCS system through it s initial chamber tests 1993 alongside the PRISM SCR subsequent Phibian dealer training and DEMA Tek Shows More recently between 2008 and 2011 Peter and Bob worked together on Oceanic s US Navy project the ATUBA Advanced Tactical Underwater Breathing Apparatus It is somewhat ironic that nearly 20 years after they first worked together these two innovative principles Bob Hollis and Peter should work together again on re
24. even on a seemingly clean surface The Tribolube will pick up an amazing amount of surrounding debris that your eyes didn t see Put a small dab of lubricant on your forefinger and lightly coat each O ring with a sheen of lubricant by running the O ring between your forefinger and thumb While you are doing this feel for any leftover debris and if found re clean the O ring and reapply fresh lubricant Immediately replace all cleaned and lubricant treated O ring back on the head after you lube them in the opposite order in which you took them off 112 Version 1 0 Prism 2 User Manual To re install the O rings start by putting the first O ring in the bottom groove 2 on the head This will make putting the subsequent O ring in place easier by not having to work the O ring past an empty groove See step 11B and accompanying field note above Once the head to bucket sealing surface has been cleaned and the treated O rings are in place on the flange it is recommended that you temporarily replace the bucket on the head This will keep debris off the cleaned surfaces until you are ready to mount the absorbent filled basket assembly on the head in preparation for diving Warning All screws that secure the bucket latch seat onto the head must be in place and in good condition Never dive the unit if any retaining screws are missing or damaged Never replace the screws with non approved hardware Doing so could cause the latch seat to
25. must re pack the scrubber Fig 332 25 Check scrubber bucket 4 steps a clean bucket sealing surface Before mounting the bucket to the head give the bucket flange O rings one last look for hair lint dirt or anything that might have fallen onto the silicone grease Clean the sealing surface of the bucket with a clean lint free cloth Check that there is no debris or hairs left on the sealing surface that could cause a slow leak into the bucket b basket compression spring installed and functional Press down on the basket compression spring making sure that the spring is functioning correctly and is firmly held in place by the retaining nut c install bucket moisture pads Place the supplied moisture pad at the bottom of the bucket d make sure the pad is not resting on or interfering with the basket compression spring Make sure the absorbing pad is laying flat and it is not hung up on the spring or basket retainer Fig 333 Fig 333 26 Place CO basket in bucket confirm center tube opening up mount and seal bucket to head Gently place the basket in the bucket Fig 334 making sure the center breathing tube is facing up Fig 335 Version 1 0 125 Prism 2 User Manual Push down on the basket top and make sure it springs back If it does not move you have either placed the basket in the bucket up side down or the spring assembly is not working correctly Open up the nylon bucket strap and slide the bucket
26. played in the Select Gas function Fig 135 Version 1 0 55 Prism 2 User Manual Pushing MENU will continue to increment the gas number Fig 136 Fig 136 Note The A denotes the active gas You cannot delete the active gas If you try it will generate an error You can edit it but cannot set both the O and He to 00 Fig 137 The computer will display all 5 gas entries available to allow you to Fig 137 enter new gases Pressing MENU one more time when the fifth gas is displayed will return you to the Define Gas menu item Fig 138 Fig 138 Only enter the gases you are actually carrying on the dive With radio station gases the computer has a full picture of the and CC gases you are carrying and can make informed predictions about decompression times There is no need to turn gases off and on when you switch from CC to because the computer already knows what the gas sets are You can still add or remove a gas during the dive if needed 56 Version 1 0 Prism 2 User Manual Dive Plannert Fig 139 INTRODUCTION Calculates decompression profiles for simple dives e In closed circuit CC mode also calculates open circuit OC bail out BO SETUP Uses the current gases programmed into the Secondary Display as well as the current GF low high settings Deco profile is computed for the current circuit mode CC or OC ON THE SURFACE Enter the dive bottom depth botto
27. the tips of your fingers if you swing your arms back with your elbows next to your ears On most people this will position the backplate at the top of the scapulas Straps should be loose enough to allow full range of movement of your arms across the chest and allow you to chicken wing into and out of the harness The crotch strap should be adjusted to keep the rig stable tight but not too tight If the crotch strap is pulling the waist strap down then it is too tight and needs to be lengthened Fig 55 A very helpful technique is to have someone shoot some video of you while hovering and while swimming Reviewing this video can help identify where your buoyancy or trim needs adjusting A good Intro to Tech instructor can also be very helpful 20 Version 1 0 Prism 2 User Manual Taking Care of your Oxygen Sensors The best way to care for an exotic animal is to first acquire some knowledge about it s likes and dislikes and environments that will help the animal thrive Likewise having a working knowledge of what is and is not good for the health of your oxygen sensors will help you take the best care possible of them and hopefully avoid unnecessary mid season damage replacement Here are some important questions and their answers What is a galvanic O sensor An oxygen sensor is a very small electrochemical generator Some people equate them to a battery but that comparison is largely incorrect since a battery does not produ
28. 23 Check filled CO scrubber basket 126 24 Install Bucket Moisture Pad 127 25 Place CO absorbent basket in bucket 127 Prism 2 Operational and Intra Dive Checks 129 26 Fill O and Diluent Cylinders 129 2 Install filled and content verified gas cylinders 130 Version 1 0 IX Prism 2 User Manual 28 Record O2 cell mV readings in air 130 29 Positive Pressure Test 130 30 Diluent System Leak Test 131 31 Negative Pressure Test ADV Test 131 32 Oxygen System Leak Test 133 33 Solenoid Test Flush loop with O 133 34 Calibrate Secondary Display Electronics 134 35 LED Primary Display on and battery check 135 36 Calibrate LED Primary Display 135 37 Solenoid Batteries check 135 38 Secondary Display Battery Check 135 39 Adjust User Selected Low High Setpoints 136 40 Record Oxygen Pressure after Loop Flush 136 41 Confirm Alternate Air Source Operation 136 42 Check Buoyancy Compensation Inflation Deflation 137 43 Record Diluent Pressure 137 Close O amp Dil Cylinders secure unit 137 44 Install weights 138 45 Verify LED Primary Display is Powered On 138 46 Don Unit Secure Fasteners Tighten Belts 139 47 Verify O amp Diluent Valves are On 139 48 Secure Secondary Display on Wrist 139 49 Verify Secondary Display is On 139 50 Verify Loop Contents are within User Set limits 139 51 Pre Breathe unit 140 Post Dive Operations 141 Post Dive Checklist 142 Post Dive Checklist Step by Step 143 Verify and Record Batteries 143
29. 6V AA battery c O rings 2 W There are two O rings sealing the battery compartment A compression seal O ring sits inside the O ring grove at the top of the electronics stack Fig 295 and its mating face is the underside edge of the battery cap Remove clean and prepare the O ring s O ring grove and mating surface for use or replace if worn or damaged The second Radial seal O ring resides in a grove on the inside edge of the battery cap Fig 296 and its mating edge is the inside surface of the electronics stack Remove clean and prepare the O ring s O ring grove and mating surface for use or replace if worn or damaged Fig 296 d cover cover latches amp keepers O W The aluminum battery cap is held in place by two Nelsen Sessions stainless steel locking latches Fig 297 Operate the latches and check that they are free of debris and the locking mechanism locks firmly into place Damaged latches must be replaced before immersing the Prism 2 in water Failure to keep the battery compartment latches in working order can result in flooding of the battery compartment The cap houses the Electronics Solenoid compartments over pressure valve This is a self closing valve and as such should not require any pre dive intervention beyond normal post dive cleaning The latch keepers are molded into the battery compartment cap Make sure there is no impact damage which could have cracked the aluminum
30. Diluent PPO 38 Gas PPO 38 Gradient Factor 38 Decompression and Gradient Factors 39 Article Gradient Factors Explained by Kevin Watts 40 VPM B GFS Explained 43 Pressure 44 Temperature 44 External Voltage 44 Internal Voltage 44 Millivolts 44 Date and Time 44 Serial Number 44 Version 44 Surface Interval 44 Example Dive 45 Menu Reference 48 Calibration Problems 49 External Battery Solenoid Battery Alerts 50 Switch Setpoint 51 Select Gas 52 Radio Station Gasses 52 Switch to OC CC 53 Dive Setup 53 Low Setpoint 53 High Setpoint 54 Version 1 0 Vil Prism 2 User Manual vill Define Gas Dive Planner NDL Display External PPO Monitoring Setpoint gt 19 Dive Log Menu Display Log Upload Log Edit Log Number Clear Log Firmware Upload and Dive Log Download Instructions System Setup Dive Setup OC Gasses CC Gasses O2 Setup Cal PPO Article When to use the Cal PPO function Diving your Prism 2 with O fills of less than 99 8 purity Solenoid Speed Set SC Identity Auto SP Switch Display Setup Units Brightness Range Altitude Flip Screen System Setup Date Time Load Upgrade Reset to Defaults Advanced Configuration Menus Salinity Title Color OC Show PPO End Dive Delay Advanced Configurations Pg 2 OC Min PPO OC Max PPO OC Deco PPO CC Min PPO CC Max PPO Error Displays Battery Change Storage Warning 55 57 60 62 63 64 64 64 64 64 65 68 68 68 68 68 69 70 72 72 72
31. Fuer IT en Gee dr eile apie m oed mn ud up Prati did und ped In Ead dai br gps nqudng mim or prang MEDS d PDP ROL For Un EDR iom Agno LYE Eg Ente 1 OF SUBSTAHCEIPREPARATION 11 CORNERS FFEBUCT LUE WO rw Era AL SL Paien 1 FELTHA 1 ren Alle PRAL ARTE Ar aod ea eee E DEGIE Compl EC Dadin 3 HAZARDS IDENTIFICATION Loot dio ee pe meee hh concessions of eor mer padece es eirin Pe h pee ey Ce ee Dii Pros Canin h d denis cum oF amia hii ku nka l ngh ma Halaha mah m panan ul dumka 41 by GHG Lunnis dal be b he m Fa hly cah uak d cami hil 4 FARSTAD MEASURES 41 HEHE op l Fon 42 EVE weile d ud and 15 43 Geek emi kira cele by nam mr ga F
32. H Plate The H Plate is made of anodized aluminum Because the hardware that connects the head to the plate is stainless steel make sure you put the nylon washers in place wherever the stainless steel hardware comes into contact with the aluminum otherwise electrolysis pitting will damage the aluminum H plate You can clean the H Plate with fresh water and allow it to dry The tank bands and bucket bands are made from nylon webbing with Velcro bands Soak the bands with fresh water and allow to dry Over time the Velcro will wear out and you will need to replace the bands with new parts 180 Version 1 0 Prism 2 User Manual Troubleshooting Primary Display Will not power on 1 Check change battery 2 Check change wiring harness in battery compartment Will not accept calibration Single cell Check mV readings in air and pure O are within operational range 1 Check mV of O cells on Secondary Display are within operational ranges 2 Check wiring harness clean connections 3 Swap cells see if failure follows cell 4 Replace cell All cells Re analyse Check for accidental calibration air Check for properly flushed loop Check mV readings in air and pure O are within operational range Check wiring harness clean connections O AeA ON Secondary Display Will not power on 1 Change battery Will not accept calibration Single cell 1 Check mV readings in air and pure O are within range 2 Check
33. Part 6 Addendum Prism 2 packing list Prism 2 packing order Part 7 Material Safety Data Sheets DeOxlt Gold Intersorb Steramine 176 176 176 176 177 177 177 178 178 179 180 181 181 182 182 184 186 194 196 198 200 201 203 208 Version 1 0 Prism 2 User Manual This page reserved for Hollis welcome message Version 1 0 xiii Prism 2 User Manual Foreword By Sharon Readey This foreword is my attempt to condense nearly 20 years of CCR development history into a few paragraphs whilst making sure everyone who deserves it gets the credit they re due I ll do best Peter Readey Photo Dan Burton When Peter Readey first got involved in diving back in the late 19805 he realized that cold European waters although teaming with life and wrecks were not conducive to fighting off narcosis and getting the best bottom times So he did what any qualified engineer would do and looked at ways to improve his hobby His helium habit quite expensive in the UK back then was disguised with his welding products but even then it was sizeable enough he realized there had to be a better way More research put him together with Stuart Clough of Carmellan Research He purchased a highly modified Rexnold 15 5 and discovered what most rebreather divers were facing back then a distinct lack of WG water proof ness delicate technology and dated performance Pete in Kraken Sept 27 Oct 1 1992 Proj
34. Secure Primary Display 143 Secure Secondary Display 143 Drain Counterlungs of Fluid 143 Remove Counterlung Weights 144 Remove Weight Pockets Weights 144 Soak complete Sealed Unit if Fresh Water 144 Turn off O Valves Drain lines 144 Turn off Diluent Valves Drain lines 144 Detach Bucket from Head Remove CO Basket Record 144 Disinfect Bucket 145 Inspect O Sensors Record Readings in air 145 Remove Counterlungs Disinfect 145 Drain and hang BCD backplate head assembly 146 Fill out Maintenance Repair log 146 Prism 2 eCCR Maintenance Repair Log Sheet 147 X Version 1 0 Part 4 In Water Skills The Pre Dive Equipment Check Buoyancy Device Weights Releases Gasses Electronics Pre Breathing your Scrubber In Water Skills and Drills Skill 1 The In water bubble check Skill 2 Controlled decent Skill 3 DSV BOV shut down drill Skill 4 Mask clearing Skill 5 Remove clear amp replace DSV BOV Skill 6 Emergency bailout onboard breathing gas Skill 7 Manual addition of diluent Skill 8 Manual addition of oxygen Skill 9 Minimum loop volume and the OPV Article Minimum maximum and optimal loop volumes and work of breathing by Dr Richard Pyle Skill 10 Manually maintain setpoint while stationary Skill 11 Manually maintain setpoint on descent Skill 12 Neutral buoyancy practice Skill 13 Manually maintain setpoint while swimming Skill 14 Manually maintain setpoint on ascent Skill 15 Clear partially flooded loop Skill 16 Diving
35. This alarm may return after being dismissed if the condition occurs again The alarm occurs when the diver has been above the minimum depth for a decompression stop for more than one minute This alarm will only appear once during a dive but it will also ap pear once on the surface after the dive This alarm will show every time the computer loses power All de compression information has been lost Fig 230 Fig 231 Fig 232 Version 1 0 Prism 2 User Manual This alarm happens when the computer does not complete all of its tasks in the time allotted It can happen occasionally from a transient problem like a battery bounce after an impact It can also be the result of a hardware problem Fig 233 This reset shows up after a software update This is the normal event that shows the computer has been rebooted after the software update Fig 234 This error usually occurs when the battery dies while the computer is asleep Ifthe battery gets too low to maintain system integrity the hardware will force the system into reset Fig 235 The following messages are reporting internal hardware failures The system will continue to retry and may recover but they would normally mean that something that should never happen has happened These messages should always be recorded and reported to the factory or your local service center Fig 236 This is not an exhaustive list There are other errors that could be r
36. any on the sensor s hydrostatic membrane See the list of approved cleaning agents in the appendix Version 1 0 113 Prism 2 User Manual b oxygen sensor wiring harness W The O sensor wiring harness has one locking Molex connector Fig 307 which connects into the head and three locking 3 pin 2 wire Molex connectors that go to each sensor The connectors are the high pressure 4 sided pin capture The wiring is silver coated copper stranded wire It really does not matter which 3 pin connector goes to which O sensor as they are mounted in the head but for diagnostic purposes the wiring color designation is as follows Color RED BLK WHT BLK BLU BLK c mV readings within 8 5mV to 14mV in air The Analytical Industries PSR 11 39 MD O sensor voltage output should be between 8 5 and 14mV in air and 40 to 67 mV at sea level in 100 oxygen the valid mV reading as far as the computer is concerned for 98 O calibration is 30 70 mV On the secondary switch the display to the sensor s mV readings and verify that the sensors are in range for the gas to which they are exposed From the main screen depress the select button until the cell readouts display their millivolt readings Fig 308 11 Bucket assembly 3 steps The scrubber bucket is made from high density high pressure injection molded clear urethane Fig 309 It is an extremely rugged durable and strong material that also helps t
37. better all around breathing characteristics have less hydrostatic imbalances in all diving positions less strain and fatigue on spinal musculature and better diver trim while diving The fitting process begins before you even set up the Prism 2 First you must assess your body type as that will give you a starting place for making close approximations to what will be the final best fit The standard counterlung yoke fits a wide range of body types and generally anyone between oft to 6ft tall with a standard torso will find a best fit using the standard counterlung yoke At the upper ranges of that measurement a person with a long torso or anyone taller than 6 will probably find that the Long yoke works best for them If you have any questions or need help finding which set up works best for you ask a Prism 2 Instructor or go into your local Hollis dealer They will be more than happy to help you get your rebreather properly fitted Once you have decided which yoke should work best you will begin testing out the different variables such as backplate position 2 available Wing position 2 available and three positions on the yoke which will dictate where the counterlungs sit on your chest First look at the backplate The harness webbing should be adjusted so the top of the backplate plate sits about 1 inch or so below your shoulders Next put the counterlungs on the yoke Take the assembly and put it on so the yoke hangs over the back
38. ceiling the raw ceiling will be displayed instead of the NDL This is the equivalent of the Man on a It will show your ceiling without it being rounded up to the next even 10 foot or 3 meter stop Please note that there is very limited information on the effects of following a continuous ceiling instead of stopping at stops and only moving up to the next stop when the stop has cleared Fig 147 It is the author s opinion that all stops should be honored It seems intuitive that if you have bubbles and you stop you give the bubbles an opportunity to be re absorbed If you continuously ascend the ambient pressure is continuously reduced which prevents bubbles from shrinking Because of this belief the computer will give one MISSED DECO STOP message during the dive and one after the dive and will flash the stop depth and time in red as long as you are above the stop depth It will use the increased gradient though and your calculated off gassing will be faster than staying at the stops The next option is to display the actual supersaturation gradient for a pure Buhlmann 99 99 profile Fig 148 The selection is GF99 With this setting as long as the NDL time is 0 you have a decompression ceiling the gradient will be displayed instead of the NDL The number shown is the percentage of supersaturation The number is calculated by reference to the Ambient Pressure Line and the M Value line It can be thought of as the cur
39. corresponds to one of the three O sensors mounted in the head and reports the oxygen reading by numbered and colored flashes of red green and orange LED number 1 L to R reports the readings from O sensor number 1 and so forth as reported on the secondary display Fig 35 LI LT Ln er Fig 35 The Primary Display light sequences for reporting loop PPO to the user is called Smithers Code and are the same for each LED Each LED reports only on the O sensor it represents so the user will see a different flash sequence of an LED if its corresponding sensor drifts out of range of the others While this may seem confusing at first having one of the three lights flash more or less often than the others is far more obvious than a single alarm The Smithers Code sequences are run in 5 second cycles throughout a dive Version 1 0 27 Prism 2 User Manual The PO light states encountered on the LED Primary Display shown in the table below and are as follows While in dive mode reporting loop PO 1 0 O is considered the mid line for the LED Primary Display When the PO is between 0 95 and 1 05 PPO you will see one orange flash every five seconds the orange color is created by both the red and green colors of the LED flashing simultaneously see field note pg 29 When the PO in the loop is below the mid line of 1 0 PO you will get one red flash for every 0 1 atm O below and one green flash for every 0 1 atm O above
40. disclosure only and should not be considered an endorsement for any product product family or manufacturer These MSDS s as printed herein may be outdated 200 Version 1 0 Prism 2 User Manual MSDS PDP5S ProGold DeoxIT amp PreserviT 5 Aerosol PRODIKT DESCRIPTIONS Predeld odpulonm ul ewes Dm b mim pope 1 dalim mig nemus mama peed Luis molar bods bana E OTHER FRODUET aem cacy ul unis po bein Bere nue Um peer heus mud nig zencba ud nih Pod br peice ped la Dci n gd pes Premi mah und perm eee po Eon ado canun For mon clum rim or rae pam Dod Pani T conum m deam edd br ami md campum or Ii cdam Deest or olor hans Prat monem mu ird For eirca d rain Maler d Revell eed FX rupe u rid b mdi ud Combest pubes magii apie band Farbe leg cia Ge eee me b wed paria Predehd Revell 1065 0 DOME und PEL ore ee
41. display on wrist The Secondary display has 2 elastic bands with plastic fastening clips The easiest way to mount the display on your wrist is to rest it upside down on your thigh place your wrist on top of the display and place the straps around your forearm clipping them together Tighten the straps down as required If you are diving with a dry suit or heavy gloves it may be easiest to ask for assistance in securing the secondary to your wrist 49 Verify secondary display is powered on Turn on the secondary by depressing both switches Look at the secondary display and verify the content of the loop that all three O sensors readings agree the battery is charged and the set point is set correctly for the dive 50 Switch active setpoint to low setpoint gt 0 4 51 Verify loop contents are within user set limits on secondary display You should not attempt to breathe from the loop if the secondary display indicates the O content in the loop is less than your pre set low setpoint At this point in the set up the computer should be monitoring the O content of the loop and adding O to keep the loop at your user selected low setpoint If the loop PO is low check that you have not accidentally switched from low setpoint to the 0 19 PO setting in the computer Do not dive your Prism 2 until the computer can maintain your pre set loop 51 Pre breathe checklist 6 steps Pre breathing gives you time to verify that
42. easy as it sounds though in practice it takes concentration since we use at different rates throughout a dive When you hear people discussing flying manually this is the skill set they are discussing Flying manually means you must continually monitor your PO adding oxygen via the manual O addition valve to replenish the metabolized oxygen in your loop In effect you become the computer Your Instructor will have you set your computer to atm setpoint with the electronics on for safety however at this stage of your training your instructor will give you a new higher set point which you will learn to maintain manually while learning new skills and mastering skills you have already practiced Remember to allow for several breath cycles after manually adding O as the gas has to move from the exhale counterlung through the scrubber and up to the O cells to register on your electronics Your breathing is the engine that moves the gas through the loop Repeat the process to manually maintain the required set point Skill 11 Manually maintain set point during descent As you read in your training manual while descending to depth on a rebreather several things are happening The volume of gas in your loop is decreasing and the PO is increasing Because the gas molecules are compressing you will need to add diluent to the loop to keep the volume of gas adequate for comfortable breathing The automatic manual diluent add
43. exceed 16 months from the date of manufacture AN 24 Version 1 0 You must NEVER use oxygen cells past beyond their expiration date no matter if the output is still within the sensor s stated operational parameters Part 2 Displays and Electronics Operation Prism 2 User Manual Version 1 0 Matthew Addison 25 Prism 2 User Manual PRIMARY DISPLAY WIRING WARNING Do not attempt to unscrew the Primary Display wiring from the head THIS IS NOT A THREADED PART Attempting to unscrew or remove the wiring from the head will destroy the wiring and quite possibly the hardware sealing surface in the head SECONDARY DISPLAY WIRING WARNING Do not attempt to unscrew or remove the Secondary Display wiring from either the head or the Secondary Display THESE ARE NOT THREADED PARTS Attempting to unscrew or remove the wiring from the head or the Secondary Display will destroy the wiring and quite possibly the hardware sealing surface in the head or Secondary Display housing 26 Version 1 0 Prism 2 User Manual Displays and Controller There are two separate diver display systems in the Prism 2 The LED Primary Display and the wrist mounted Secondary Display LED Primary Display The LED Primary Display Fig 34 consists of 3 bi color red green LEDs light Emitting Diodes mounted on either the right or left side of the DSV BOV mouthpiece just below eye level Each of the three bicolored LEDs
44. fail and the unit to experience an immediate and catastrophic flood possibly leading to injury or death c bucket latch keeper W O The bucket latch keeper is a stainless steel channel that runs around the face of the head and is screwed into place Verify that the 4 screws are in place and the seat is not loose Fig 305 If the seat were to fail during a dive the Velcro bucket strap would most likely keep the bucket firmly seated on the head however with a failed latch keeper a catastrophic flood could result Field Notes Spares kit Immediately log any item you are taking from your spares kit in your Maintenance Repair Log to remind you to re order new spares Otherwise next time you need a spare it won t be there 10 Oxygen sensors 3 steps a 3 oxygen sensors and sensor holders installed 1 The three oxygen sensors are mounted on the underside of the head in removable vibration resistant cell holders Fig 306 Each cell holder is held in place by two pins Make sure all three cell holders are firmly seated on the pins and are in good condition You should never allow any silicone or other lubricant to get on the sensor housings or the sensor holders as that could allow the sensor to slide out of the holder during a minor transit impact thereby damaging the sensor If there is grease on the sensor housing or holder gently clean both with a mild surfactant cleaner such as Simple Green taking care not to get
45. first stages All Prism 2 first stages Fig 32 have been oxygen cleaned and assembled in a clean room environment with specially designed materials halocarbon based lubricants and color coded for easy identification on and off the Prism 2 chassis green O Black Dil In non CE countries they come outfitted with 300 BAR 4500 PSI DIN connections and custom designed port blocks with 4 low pressure and 1 high pressure ports This custom design does away with the need to add in fail points such as hose swivels The working Intermediate pressure of both first stages is 130 to 150psi 8 96 to 10 34 bar All First stages are equipped with pressure relief valves Fig 33 The valves reduce the likelinood of an uncontrolled increase in intermediate pressure causing a free flow of gas into the breathing loop The first stage pressure relief valve is not a user serviceable part The oxygen feed lines to the solenoid and manual O addition valve incorporate in line flow restrictors to meter the flow of oxygen into the breathing loop The restrictors must not be removed Gas Cylinders The Hollis Prism 2 will accommodate all sizes of cylinders commonly used on rebreathers Version 1 0 15 Prism 2 User Manual Fitting your Prism 2 Your Prism 2 rebreather should be fitted to you with the same attention as you would any other fine and very expensive custom made piece of clothing A properly fitted rebreather will perform more consistently with
46. from 2 999 meters you enter a setting that is outside the allowed range the existing valid setting is retained with no change Display Setup Fig 205 206 Units The first Display Setup changeable option is Units which allows the computer to switch back and forth between Metric and Imperial units of measurement Brightness Range The next Display Setup changeable option is Brightness which al lows the computer to switch between four brightness settings Auto Low Medium and High Fig 207 It should be noted that Hollis Gear suggests the use of the auto function as it makes use of a light sensor to provide maximum brightness when there is an excess of ambient light yet will dim Version 1 0 Prism 2 User Manual Fig 202 Fig 203 Fig 204 Fig 205 Fig 206 Fig 207 73 Prism 2 User Manual 74 when there is less ambient light in order to conserve battery life Altitude Fig 208 The altitude setting when set to Auto will compensate for pressure changes when diving at altitude If all your diving is at sea level then setting this to SeaLvl will assume that surface pressure is always 1013 mBar 1 atmosphere Important When diving at altitude you must set this option to Auto the default setting is Further when diving at altitude you must turn the computer on at the surface If the auto on safety feature is allowed to
47. given depth is the gas with the highest PPO that is less than or equal to this value Also the suggested gas switches when the current gas is displayed in yellow are determined by this value If you change this value please understand its effect For example if lowered to 1 50 then oxygen 99 00 will not assumed at 20ft 6m Default 1 61 Note Semi closed SC PPO alarms and gas switch depths use the OC values CC Min PPO PPO displays in flashing red when less than this value Default 0 40 CC Max PPO PPO displays in flashing red when greater than this value Default 1 60 Note In both OC and CC mode a Low PPO or High PPO alert is displayed when the above limits are violated for more than 30 seconds 78 Version 1 0 Prism 2 User Manual Error Displays The system has several displays that alert an error condition All ofthese displays share a common limitation of error alarms There is no way to distinguish between an error alarm that is not in alarm and an error alarm that is broken For example if an alarm is silent when it is not in alarm and is silent when it is broken then there is no way to be sure that the alarm isn t broken So by all means respond to these alarms if you see them but NEVER depend on them Each of the alarms will display the message in yellow until dismissed The error is dismissed by pressing SELECT Other functions continue to operate as normal so that the MENU butto
48. hoses check and install 6 steps O open close purge mouthpiece check mushroom valve seals and flow direction install hoses onto DSV BOV perform a mushroom valve sealing test stereo check install DSV BOV onto counterlungs paying attention to flow direction arrow install LED primary display holder fix attach cable to breathing hose Clean head to bucket sealing rings o ring groves and lube o rings remove o rings per manual instructions clean amp replace if needed Clean Red CO Seal and secure in place 2 steps sure there is no debris dust or lubricant Clean seal grove make sure the red CO seal is firmly seated in its grove triple check O Check filled CO scrubber basket 2 steps 1 basket top secure check for settling and firmness of absorbent bed O Scrubber bucket 4 steps D ensure bucket sealing surface is clean basket compression spring installed and functional install bucket moisture pads Oo sure the pad is not resting on or interfering with the basket compression spring Place CO basket in bucket confirm center tube opening up mount and seal bucket to head record usage time on operational checklist 04 Version 1 0 Prism 2 User Manual Prism 2 Operational Checklist Step by step descriptions are located in the user manual Name Date Intra Dive UNo LI Yes Scrubber New LlJUsed Total time used on scrubber _____ Maximum Scrubber Duration 2
49. how the hose comes to rest against the counterlung Lift the hose up to its diving position You can look at the hose clamp to visually mark where the top of the hose should be Re install the DS V BOV 122 Version 1 0 Prism 2 User Manual f install LED primary display holder Fix attach cable to breathing hose The Primary Display is held on to either the right or left DSV BOV counterweight by a plastic c clamp Fig 327 The c clamp is designed to come off from the counterweighted nut fairly easily in the event of an impact or entanglement This design protects the wiring from damage How the wiring is run is user choice but take caution not to run the wiring in such a way as to make it an entanglement hazard The Primary Display wiring from the head can come down the inside of the breathing tubes and be held in place by Velcro straps Fig 327 22 Clean head to bucket sealing O rings O ring grooves and channel and lubricate O rings In the pre assembly checklist step 11B you checked and cleaned the bucket sealing O rings If you are assembling the Prism 2 right after your pre assembly checks you do not need to re clean the O rings You can simply use this step to verify that nothing had fallen onto the O rings that could cause a leak during dive operations If the Prism 2 has been transported or disassembled in such away that debris could have gotten on the O rings we recommend repeating this step We have duplicated thes
50. is another programmed gas that is more appropriate at the current depth than the current gas Fig 61 No Decompression Limit NDL Fig 62 The time remaining in minutes at the current depth until decompression stops will be necessary Displays in Yellow when the NDL is less than 5 minutes Fig 63 Once the NDL limit has been exceeded this value can be set to optionally display other information These options are CEIL The current ceiling in the currently selected units feet or meters Flashes Red if you ascend shallower than the current ceiling Fig 64 GF99 The raw percentage of the Buhlmann allowable su persaturation at the current depth Fig 65 5 The time to surface TTS if you were to stay at the current depth for 5 more minutes Fig 66 Version 1 0 Prism 2 User Manual Fig 55 Fig 56 I Fig 60 P I 3 Prism 2 User Manual Time to Surface TTS Fig 67 The time to surface in minutes in the current circuit mode Assumes an ascent rate of 30 feet per minute 10 meters per minute that stops will be followed and programmed gases will be used as appropriate Maximum Depth Fig 68 The maximum depth of the current dive When not diving displays the maximum depth of the last dive CNS Toxicity Percentage Fig 69 Central Nervous System oxygen toxicity loading percentage Flashes Red when 100 or greater Fig 70 The CNS percentage is calculated co
51. it in your mouth while verifying that the tank valve is turned fully on Close the DSV BOV and remove it from your mouth Place the bailout second stage in your mouth purge it and breathe normally Signal your buddy and prepare for your ascent Remember to exhale tiny bubbles whenever the mouthpiece is out of your mouth 160 Version 1 0 Prism 2 User Manual Check your secondary to verify that you are at your set point Stow the regulator hoses back under the stowage cords to avoid entanglements Close the bail out tank valve leaving the regulator charged Now that you have two bailout systems available the question arises as to which one to deploy first in an emergency Always deploy your off board system first and leave your diluent supply available to fill your buoyancy device once you are on the surface Should you need to deploy the bailout bottle to assist another diver in an out of air emergency give them the bailout regulator remembering to check that the air supply is turned on Field Notes Do not ascend Because we are only practicing switching to bailout for now you can take a few breaths remove the second stage and place the DSV back in your mouth Fully purge any air from your lungs through the DSV BOV purge hole then open the DSV BOV and resume normal breathing Skill 17 Off board bailout assist of another diver Should you be called on to supply air to another diver you should deploy your off board bail
52. keepers Version 1 0 109 Prism 2 User Manual Warning The Battery cap is equipped with a pressure relief valve If the battery compartment were to flood battery acid and poisonous gasses will form inside the compartment You must never expose yourself to either the acid or gasses from a venting battery compartment Should the compartment flood during diving operations the pressure relief valve will rupture and vent the pressurized gasses and acid into the surrounding water Because the Solenoid and Primary Display batteries are in this compartment if the compartment floods the batteries will quickly lose their charge and the Primary Display and the Solenoid will stop working After a battery compartment flood you must take precautions while cleaning and disposing of all the materials within the compartment and must not dive again until you have replaced the battery cap pressure relief valve See the maintenance section for further information on recovering from a flooded battery compartment 8 Solenoid operation O W if you are proceeding immediately to assembly and operational checks you can skip this step While you will be verifying the operation of the solenoid with the operational checks it is always a good idea to verify its operation at this stage if you will be traveling away from immediate repair support To check the solenoid operation now you will need to hook up the oxygen side 1st stage solenoid supply h
53. mode if enough battery charge remains for it to do so Low battery warnings will only occur once at power on and will not be repeated until the LED Primary Display power is cycled off and on again Fig 37 WARNING You must change the Primary Display battery when you receive a low battery warning Failure to change the battery when the Primary Display indicates a low battery during power on could result in the LED Primary Display shutting down unexpectedly mid dive Cell Calibration Accepted If calibration of all three cells have been accepted the Primary Display will illuminate the 3 LEDs in red for 5 seconds without blinking If any cell has failed calibration the LED corresponding to the failed cell will oscillate green red continiously until a successful calibration of that cell has been achieved Cell Calibration Failed Any cell that fails calibration will flash green red continiously until a valid calibration for that cell is accepted by the controller If all 3 sensors fail calibration all LEDs will flash green red continiously It is rare that all three cells would fail calibration at the same time if they are within their expected service life not damaged by mishandling and the loop is fully flushed with oxygen Ususally an accidental calibration in air or an incomplete loop flush with pure O2 will cause all three sensors to fail calibration concurrently Lost Signal If the Primary Display were to lose cell signal for an
54. nice 37 719 Wear stale Hove and EyelLace S 4 In case at accent if yore feel umuell medical acheive show label if pose Hyilraxide 4 e weicht 4 First Aid Measures Get medical Do NOT allow vicum rub ar keep eyes dosed ve mesion wih water 15 Eed lead 30 minnes oct medical asd U mnediaiely kin with plenty of water Tor at feast 15 wile contaminated and shoes Remeave chius m which limis farther expose Rerrve chiuse and shoes Thinsouphly clean clothe and ses before mae Enge Do Indore vomit victim conscieus and alert proe Co wales Mever 2Tve anyihine by mauth an uncamckmz perm Cet immer y medical aic Remove frin expozune and fresh air 5 Fire Fighting Measures Fre Prouduct iz rw cansulered to be a Packaging may be cena Faison Mor carulered be an explo WU ET 3 Fik apih maeri condered to he ma e NOTE CO E rus aiibi m meduc Eire reaciam may ccmr G Arculemial mesures Health precautions Du nci Inhale released dmi Use dux mask type Us proper perxzoanal primecirve equipment in Secti
55. outer sleeve counter clockwise until the valve comes loose from the lung Fig 280 102 Version 1 0 Prism 2 User Manual 9 Over pressure valve OPV The over pressure valve is located on the right exhale counterlung slightly below the threaded hose opening Fig 281 Rotate the body open and closed You should feel a slight ratcheting as you twist the body Rotate the OPV body clockwise until it is fully closed in preparation for the oxygen flush during your operational check If you want to remove the OPV from the counterlung for closer inspection grasp the valve body on its lower ring closest to the counterlung fabric and turn the valve counter clockwise until it comes free from the counterlung Field Notes The Sniff test Sniff the air inside of the counterlung It should smell clean and possibly have a hint of disinfectant smell to it This is normal when using Hollis approved breathing loop cleaners however a distinct smell of disinfectant is not normal and is probably due to inadequate rinsing after cleaning 3 Inspect DSV BOV breathing hoses 4 steps a inhalation and exhalation hoses W While holding the hose by each end gently stretch them to insure the ends are secure If there is any movement check the hose clamps and hose material next to the clamps Fig 282 for wear or tears While holding the hose gently pull on the seating flanges to insure they are secure If there is any movement check the hos
56. place on the inside seating surface of the cylinder rests Check the cylinder bands for wear b harness w Check the webbing for excessive wear Check D rings buckle crotch strap and any diver installed hardware such as knives or equipment pouches are present and in working order c BC fabric W Lay the BC down flat and inspect the fabric for any tears or signs of excessive wear Pay special attention to areas around inflators and areas that experience chaffing during use Never dive the rebreather with a buoyancy compensator that is not in good condition d inflator deflator or Hollis 410 if installed O W Depress the inflator and deflator buttons feeling for smooth actuation If there is any binding or sticking of either button this usually indicates that salt has dried inside the mechanisms Dried salt can abrade O rings and cause slow leaks If you do find that the inflator buttons stick on first actuation clean with fresh water or repair as needed You will complete a pressurized test of the inflator later on in the operational checks However it is always a good idea to test each component but especially important if you find that the buttons have been sticking Finally partially inflate the buoyancy compensator by manually blowing air into the valve Fig 265 while depressing the deflator button Check that the buoyancy compensator is holding air and not leaking Do not deflate the buoyancy compensator See step e dump v
57. pliers Large Bottle brush toothbrush Tribolube Steramine Since there is no valve on the end of the hose assembly you do not need to take the hose assembly apart for a simple cleaning You can simply put the hose in a bucket filled with Steramine and clean the interior of the hose with a bottle brush DO NOT attempt to force the Version 1 0 175 Prism 2 User Manual bottle brush through the elbow fitting Use the toothbrush to clean the fitting If you need to treat the O ring under the counterweight you will need to remove the 2 Oeteker clamps and pull the fitting from the hose Put the counterweight aside Remove the O ring clean and treat it and its mating groove then replace the O ring and reassemble the hose DSV Dive Surface Valve Tools needed Dikes or knife to cut off mouthpiece retaining strap wrench Tribolube clean dry cloth sponge Steramine Replacement parts needed New mouthpiece retaining strap Because the DSV barrel is opened and closed frequently and over time can become hard to actuate as the Tribolube migrates away from the sealing O rings it is always a good idea to service the valve during a routine cleaning As long as the O rings do not appear worn or flattened they can be re used If you are using a short hex wrench you may need to remove the mouthpiece so the hex wrench will reach the knob retaining screw If you are using a T handle hex wrench long shaft you will not need to remove the mo
58. powers the solenoid and one SAFT 3 6 volt Lithium lon that powers the LED Primary Display The sealed bulkhead power connector at the bottom of the compartment is a female molex connector A foam insert holds the batteries in place O sensors sensor holders connector pins The 3 O sensors are located in a chamber above the scrubber basket Fig 22 This insures a low condensation area and consequently drier O sensors The sensors are Analytical Industries PSR 11 39 MD which have an operating range of 8 5mV 14mV in air and 40 6mV 67mV at 100 at 1 atm pressure The holders are removable to give users better access to the O sensors wiring harness and connector pins The holders are I Fig 22 manufactured from a soft silicone material to help protect the O sensors from vibration and minor impact forces See Taking Care of your Oxygen Sensors on page 21 for more information Solenoid Fig 23 The Prism 2 solenoid is a low power 0 65 watt normally closed electromagnetic valve mounted in an isolated compartment in the head The normally closed solenoid will only allow gas to flow when an electrical current is applied and the valve is momentarily opened Operational failure or loss of adequate voltage to open the solenoid valve will keep oxygen from flowing into the system Oxygen flows from the solenoid body directly into a channel that leads from the solenoid into the exhaust plenum in the head F
59. rebreather were to ever lose gas containment such malfunction requires that you bailout to open circuit and abort the dive immediately See Field Notes Malfunctioning oxygen feed above Skill 20 Changing computer set points underwater To manually change from low to high or high to low setpoint while underwater from the main dive screen press the MENU button once to go to the Switch value 1 gt value 2 Press the SELECT button to switch Skill 21 Bailing out the computer to open circuit underwater Depress the MENU button times until you see SWITCH value gt value where value is either OC or CC mode Press the SELECT button to switch Version 1 0 163 Prism 2 User Manual 164 Skill 22 Deploying a surface marker buoy SMB An important part of your rebreather kit will be an SMB surface marker buoy and line reel The SMB will be used any time you are ascending to the surface or safety stop in open water and need to mark your location for a safe ascent To deploy the marker uncoil the SMB and clip or tie the reel line to it Keeping the SMB and line in front of you at all times place your second stage alternate gas source below the bottom opening of the SMB and add enough gas to partially inflate the SMB It is not necessary and you should not attempt to fully inflate the SMB underwater as the gas in the SMB will expand as it ascends toward the surface Holding the line reel at arm
60. section O Setup Fig 192 The fourth submenu is O Setup This menu allows the user to edit the Oxygen settings Cal PPO Fig 193 This allows the user to set the expected PPO for calibration It is used in three situations Fig 192 The first is when pure oxygen isn t available and the oxygen is be ing generated by a membrane system The oxygen in that case might be 96 O and a few percent of Argon See full explanation on page 70 The second is when you are using a calibration kit and are assured Fig 193 of using 100 O with no water vapor lf any change Is made in this screen the current calibration will be discarded The computer must be re calibrated with the new setings Version 1 0 69 Prism 2 User Manual When to use the Cal PPO function Diving your Prism 2 with O fills of less than 99 8 purity In some parts of the world usually remote locations it can be difficult to obtain oxygen fills that are for all intents and purposes free of inert gas In some of these locations a process of gas separation called Pressure Swing Adsorption PSA is used where cryogenic or large scale compressed cylinder storage is not feasible PSA is a good choice for economical small scale production of nearly but not quite pure oxygen separated from air The gas produced by PSA systems and used in medical applications in these locations is perfectly safe for the intended uses So how does PSA work Wh
61. small such that you can not hear gas escaping while the loop is under pressure you can submerge the rebreather in water and look for a trail of bubbles Tanks must be mounted on the first stages prior to submerging the unit to avoid flooding the first stages Do not submerge a fully built and absorbent packed unit that rapidly loses air because you could fully flood the unit ruin your absorbent and destroy the O sensors Never dive a Prism 2 that shows signs of a leaking loop as that could lead to injury and possibly death Field Notes Fail Needs Cal If the secondary electronics do not have a valid O calibration stored in memory the solenoid will not fire when the system is turned on If the secondary display reads FAIL on the O sensor readouts Fig 344 you will need to use the mV readings to verify a proper loop flush c allow to sit for one minute watch for signs of leaks on Secondary Display PO mV readings After you have fully filled the loop with oxygen with the OPV closed until it engages and allows gas to escape you will have created a positive pressure environment which will slightly raise the PO mV output of the O sensors so long as the loop remains slightly pressurized Make a mental note of the values on the display as soon as you stop adding O Allow the loop to Version 1 0 129 Prism 2 User Manual sit for at least a minute watching if those values drop slightly which could indicate a leak Be car
62. t need diluent until you reach the surface unless an on board bailout is required turn the diluent valve until only a trickle of gas is escaping from the leak Maintaining positive pressure in the pneumatics will keep the diluent side of the loop from flooding If you did need to breathe from the on board bailout for some reason during your ascent you could feather the valve which means turn the valve on when gas was needed and almost fully shut when it was not Once at the surface you would need to turn on the tank to inflate your buoyancy device or manually inflate the buoyancy compensator and then turn the tank back to almost fully off to conserve diluent until you were feet dry Oxygen Pneumatics Now lets deal with the oxygen pneumatics The first rule of a closed loop is anytime you turn off oxygen you must first switch to open circuit bailout Never breathe from a closed loop that does not have a working supply of oxygen If the oxygen side of the loop had lost containment immediately switch to open circuit bailout While you are ascending to the surface turn the O cylinder valve almost fully off but leave the valve cracked slightly so only a trickle of gas is escaping This will allow some pressure into the pneumatics to keep the oxygen pneumatics from flooding Warning Malfunctioning oxygen feed Do not dive or breathe from a closed loop if any part of the O pneumatics system normal operation is compromised The corre
63. tear down are required Version 1 0 11 Prism 2 User Manual The Solenoid and the PID controller The Prism 2 Solenoid is controlled by state of the art PID Control loop feedback circuitry The Controller The PID Controller makes calculations based on an error value which is calculated as the difference between a measured process variable how much oxygen is in your loop and a desired setpoint the O setpoint It also considers the history of what has occurred previously and makes predictions about what may occur in the future constantly making adjustments to it s algorithms accordingly Sometimes called a Three Term Controller the P and D stands for Proportional Integral Derivative A familiar example of a control loop is the action taken when adjusting hot and cold faucets valves to maintain the water at a desired temperature This typically involves the mixing of two process streams the hot and cold water The person touches the water to sense or measure its temperature Based on this feedback they perform a control action to adjust the hot and cold water valves until the process temperature stabilizes at the desired value The sensed water temperature is the process variable or process value The desired temperature is called the setpoint The input to the process the water valve position is called the manipulated variable The difference between the temperature measurement and the set point is the error and quan
64. that may have collected in the O ring grooves Version 1 0 123 Prism 2 User Manual Put a small dab of silicone on your forefinger and lightly coat each O ring with a sheen of Silicone by running the O ring between your forefinger and thumb While you are doing this feel for any leftover debris and if found re clean the O ring and reapply fresh silicone Immediately replace all cleaned and silicone treated O ring back on the head after you lube them in the opposite order in which you took them off 23 Clean Red CO Seal and secure in place 2 steps The Red CO Seal is a large soft red silicone gasket that resides on the underside of the head in a channel that face of the exhaust plenum which is next to the three O sensors Fig 331 N The Red CO2 Seal is a critical component of a properly functioning breathing loop If the gasket were left out during operation the unit will not scrub any CO and you will have 100 breakthrough For this reason you must verify that the gasket is in place seated properly in its groove clean and undamaged Failure to check the Red CO2 Seal will lead to serious injury or death Fig 331 Warning a make sure there is no debris dust or lubricant Clean seal groove Check the face of the red CO2 seal to insure there is no old absorbent or other debris that could compromise a proper seal of the basket Remove the seal and check that there is no lubricant in the seal channel that could caus
65. that your diluent and O addition valves are working by manually depressing them Verify that all on and off board bailout sources are operational 410 BOV off board bailout system by breathing from them while monitoring their respective SPGs to insure proper function E Electronics If your electronics primary and secondary are not already powered up turn them on and verify that the loop contents are within your pre set values and no alarms are showing 146 Version 1 0 Prism 2 User Manual Pre Breathing your scrubber Once you have completed your checklist and have donned the rebreather you will complete a pre breathe of the loop This important safety step must be done to try and verify that the chemical reactions which take place in the scrubber bed and are needed to sequester gaseous CO begin and to warm up the scrubber bed Warning Despite doing a pre breathe it is entirely possible that unhealthy levels of CO can build up in the breathing loop for any number of seen and unforeseen reasons You must remain vigilant for the symptoms of CO poisoning at all times while diving a rebreather First you must begin the pre breathe by sitting someplace where in the unlikely event you were to succumb to the effects of elevated CO due to scrubber or equipment failure you would not fall and get hurt To insure a proper seal of the loop and evaluation of loop integrity either wear your scuba mask or pinch your nose to m
66. the O ring groove or O ring mating surface Field Notes You can use a Clean dry lint free cloth on opposite sides of an O ring then putting pressure on it push toward the middle Fig 259 This will create a hump that you can grab with your fingers and roll it out of the groove In a pinch the tapered end of a plastic Zip Tie can be used to help pull an O ring up and out from its groove Clean the O ring with a soft dry lint free cloth Fig 259 being careful to remove any debris and old Tribolube Run your fingers around the O ring feeling for uneven surfaces abrasions sand or other debris that could cut the O ring If you feel any damage replace the O ring Never dive with a damaged O ring as a flood will result Fig 259 Clean the O ring channel and area surrounding the channel of debris and old lubricant Fig 260 Place a small amount of Tribolube on your finger and coat the O ring lightly Inspect the O ring to make sure there is no debris lint or hairs on it Carefully replace the O ring in its cleaned O ring channel Make sure to clean the O ring s mating surface the surface the O ring seals against of all lubricant dirt and lint Fig 260 98 Version 1 0 Prism 2 User Manual Prism 2 Component Inspection 1 Check H Plate harness BC for wear damage or missing parts 7 steps a H Plate Look for any bent or broken parts on the H plate Verify that the rubber cylinder pads are firmly glued in
67. threads can become clogged with crushed absorbent making screwing down the top difficult If absorbent dust does become caked in the threads soaking the threads in 100 white vinegar for 15 to 20 minutes will usually dissolve all the material You may need to remove any residual material with a stiff toothbrush After cleaning rinse the basket thoroughly in fresh water The center tube is removable in the event that it requires service or replacement Should you wish to remove the center tube for cleaning you can do so There is an O ring at the base of the center tube You can remove it for cleaning but DO NOT lubricate the O ring as doing so will only collect absorbent dust onto the O ring Version 1 0 179 Prism 2 User Manual Buoyancy device After use always drain the buoyancy device before hanging to dry and packing Every so often you may want to flush the inside of the buoyancy device with warm fresh water to clean the interior To clean the bladder remove the inflator hose from the bladder and run fresh water into the bladder Open the bottom drain and allow some water to run through the drain hole Once the bladder is fully flushed with fresh water turn the bladder upside down and drain the water Hang the bladder upside down and allow the bladder to dry overnight If you are hanging the bladder outside or where bugs can get in stuff the opening with a paper towel to keep the bugs out while the interior of the bladder dries
68. to serious injury or death WARNING Weighting of the Hollis Prism 2 Unlike open circuit scuba gear it is possible for the Hollis Prism 2 breathing loop to flood causing the rebreather to quickly become 17 pounds negatively buoyant not including any user added weight or offsetting buoyancy inflation It is the responsibility of the diver to insure that the Hollis Prism 2 is never weighted in such a way that it is not possible for the installed buoyancy device to overcome the flooded weight of the unit plus any diver added non detachable weights and still provide enough positive buoyancy at the surface to keep the divers head well above water Consult your instructor dealer or call the Hollis factory directly with any questions or concerns Failure to maintain positive buoyancy at the surface with the Hollis Prism 2 in a fully flooded state can lead to serious injury or death IV Version 1 0 Prism 2 User Manual Caution Batteries tested in the Prism 2 It is strongly recommended that only name brand batteries such as Duracell or Eveready are used to power the Prism 2 Off brand Discount batteries have been found to vary greatly in quality of materials from batch to batch and even piece to piece and therefore may not perform as expected or be capable of consistently delivering the power required to drive the components despite battery voltage levels reported by a battery voltage meter WHILE OFF BRAND DISCOUNT BATT
69. vessel after the checks are completed The optimal analysis pressures range is 5 30 PSIG up to 100PSIG with a flow rate of 1 2SCFH The longer you keep the cells pressurized the slower you need to bleed off pressure This procedure may sound familiar to divers What is the maximum altitude the oxygen sensor can be exposed and still function The oxygen sensors have been tested up to 20 000 Ft 6096M with no error Does moisture or water affect the oxygen measurement If moisture or water is present in the gas stream it will not damage the oxygen sensor or analyzer but it can collect on the sensor s sensing membrane thus blocking the flow of gas What happens when the O sensor has been exposed to water The collection of condensation on the sensing surface of the sensor standing water reduces the signal output Once either drying or gravity removes the standing water the signal output will return to normal within 30 seconds For example a thin layer of water over the sensing surface will reduce the signal output of a sensor from 11 8mV to 10 1mV within 20 minutes 22 Version 1 0 Prism 2 User Manual remove the standing water and the signal output returns to 11 8mV in 30 seconds The design of the Prism 2 makes condensation collecting on the face of the sensor such that the signal can be degraded in a normal diving position very unlikely Note Salt water can corrode or bridge electrical connections resulting in erratic oxygen readings
70. was set in step 29 Depress the menu button 3 times until Switch 19 gt is displayed on the screen Depress the select button once to select the programmed low setpoint Repeat to choose the programmed high setpoint b solenoid fires and oxygen injection is verified As long as the high setpoint is greater than 1 0 PO the solenoid will begin firing to add oxygen to the loop If the high setpoint is less than 1 0 PO will either need to drop the loop PO by injecting diluent via the ADV or increase the high setpoint in the System Setup menu Once the solenoid begins injecting O you should be able to hear the oxygen entering the loop at the exhaust plenum but if you are in a noisy environment such as on a boat you can simply turn off the O cylinder valve momentarily and watch for the pressure gauge needle to drop as the solenoid fires or release some pressure from the loop by manually pressing the OPV then watch as the counterlungs expand as the O enters the loop Make sure to turn the oxygen valve back on if you momentarily shut the valve during the test c change active setpoint to 19 Once the solenoid has fired and you have verified that oxygen is getting into the loop change the active setpoint back to 19 by depressing the menu button 8 times until Setpoint 19 shows on screen Fig 348 Depress the select button once The solenoid should stop firing 36 Solenoid Batteries check Xreplaced amp OK From t
71. weights on the system Since trim weights are not easily ditch able in an emergency use them sparingly and make sure that the total non detachable weights plus the weight of a fully flooded loop 17 Lbs is not greater than the buoyancy compensator can lift and maintain positive buoyancy on the surface 45 Verify LED primary display is powered on Turn on the primary electronics while watching the LED Primary Display All LEDs on the LED Primary Display should begin to blink reporting the content of the loop If the primary display blinks orange for 30 seconds at start up you must change the battery before diving step 34 46 Don unit secure fasteners tighten belts Attach counterlung straps crotch strap s cummerbund and waist strap and tighten as needed 47 Verify oxygen and diluent valves on 3 steps a diluent valve check Version 1 0 135 Prism 2 User Manual Reach behind you with your left hand and verify that the diluent valve is ON rotate valve downward Check the diluent pressure gauge b oxygen valve check Reach behind you with your right hand and verify that the oxygen valve is ON rotate valve upward Check the oxygen pressure gauge c activate manual gas addition valves O and diluent while watching SPGs While watching the diluent pressure gauge momentarily depress the ADV While watching the oxygen pressure gauge momentarily depress the O manual addition valve 48 Secure secondary
72. when cycling through menus The no decompression limit NDL is zero since we are in decompression and the time to sur face TTS is 15 minutes The computer works in both metric and imperial for depths and temperatures The depth shows a decimal point when the depth is between and 99 meters It shows no decimal point if the display is set to feet To turn the computer on press both the MENU and the SELECT buttons at the same time 30 Version 1 0 Prism 2 User Manual Buttons MENU Left From the default display pressing MENU brings up the menu e the menu system MENU moves to the next menu item e Ifthe current function is an edit pressing MENU increments the current display SELECT Right e Inthe menu system the select button saves the current value or executes the command e Out of the menu system the select button brings up information displays BOTH BUTTONS e When the computer is off pressing MENU and SELECT at the same time will turn the com puter on The left button MENU can be used to scroll through the menu When the Switch Setpoint menu item is displayed MENU will move to the Select Gas menu item Fig 39 Fig 39 The right button SELECT is used to accept the current choice Pressing SELECT with this screen displayed will enter the Select Gas function Fig 40 Fig 40 In the Select Gas function MENU increments the gas number Fig 41 SELECT
73. will fall back out of the Select Gas display without changing the se lected gas The current gas will flash YELLOW when more appropriate gas is Fig 118 defined Use the Confirm button to select a gas The bottom line of the display shows the selected gas An A will appear next to the currently active gas rur cown OCTACHASLE PLAYE Radio Station Gases The system maintains two sets of gases one for open circuit and one for closed circuit The way they operate is very similar to the way car radios work with AM and FM stations When you are listening to an FM station and you push a station selection button it will take you to another FM station If you add a new station it will be an FM station Similarly if you are in the AM mode adding or deleting a station would add or delete an AM station With radio station gases when you are in open circuit adding deleting or selecting a gas will refer to an open circuit gas Just like the FM stations are selected when your radio is in FM mode the closed circuit gases are available in the closed circuit mode When you switch to open circuit the gases available will be open circuit gases 52 Version 1 0 Switch to Depending on the current computer setting this selection will show as either Switch CC gt OC or Switch OC gt CC Fig 119 121 Pressing SELECT will select the displayed mode for decompression calculation
74. with off board open circuit system Skill 17 Off board bailot assist of another diver Skill 18 Valve shutoff drills Skill 19 Leak detection disconnecting QD s Skill 20 Changing computer set points underwater Skill 21 Bailing out the computer to OC underwater Skill 22 Deploying a surface marker buoy SMB Optional Using a drysuit with a rebreather Skills and Drills Completion List Article The language of Oxygen Part 5 Maintenance amp Troubleshooting Non User Serviceable Parts Preventative Maintenance Schedule Battery Compartment Housing Replacing the Battery Cap Pressure Relief Valve Battery Cap Locking Latches Stainless Steel Roll Bar Electronics Stack Solenoid Chamber Exhaust Plenum Red CO Seal Version 1 0 Prism 2 User Manual 149 149 149 149 149 149 150 150 151 152 152 154 154 154 155 156 156 157 158 158 159 159 160 161 163 164 164 165 166 167 167 167 168 169 171 172 173 174 174 174 174 175 175 175 175 XI Prism 2 User Manual O Sensor Holders O Sensor Harness O Sensors Inhalation Counterlung hoses Inhalation Counterlung and drain Automatic Diluent Addition Valve DSV BOV Inhalation hose amp fitting DSV BOV Exhalation hose amp fitting DSV Exhalation Counterlung and drain Manual Oxygen Addition Valve scrubber Bucket amp Basket Spring scrubber Basket Buoyancy Device H Plate Troubleshooting Mechanical drawings amp part numbers
75. would require maintenance or repair Record the damage in your maintenance repair log and address the needed repairs immediately after finishing your post dive checklist 140 Verify and record batteries Turn off electronics This is a good time to verify that the batteries in your Prism 2 have enough power for continued use Should you need to replace a battery it is better to find out now than to be scrambling for new batteries during set up Solenoid battery V Good O Replaced I Secondary display battery V Good O Replaced O From the main menu depress the select button right six times until the lower display shows the solenoid ext and secondary display int batteries A voltage reading of less than 3 28 volts for the secondary display and a voltage of 4 volts for the solenoid indicate a battery that must be changed If you change a battery make sure to notate it on your maintenance log SO you remember to replace the battery in your spares kit Primary Display Good O Replaced O Turn off the primary display then turn it back on If the display blinks orange continuously for 30 seconds upon turn on the battery must be replaced Otherwise consider the battery to be good but have a spare in your kit just for safety Remember both the Primary and Secondary displays use SAFT 3 6V AA batteries Secure secondary secure the secondary so it is not damaged during cleaning or tear down Pay particular
76. would select closed circuit gas 2 Fig 42 Version 1 0 31 Prism 2 User Manual When the system is not in a menu pushing SELECT will bring up information displays with various dive status information This is the first information display showing the diluent PPO amount the current CNS loading the setpoint if applicable and the average PPO being used for decompression calculation Fig 43 Menu The system is designed to make the selection of the common operational functions while diving easy The menu selections are separated into two sets The Operation menu is to provide easy access to commonly used functions The Setup menu is to change system set tings The system will continue to read the sensors and update the sensor display while you are in the menu system If no buttons are pushed for a minute the menu system will time out Anything that had been previously saved will be retained Anything that was in the middle of editing will be discarded A key characteristic of the menu system is that it is adaptive It uses the information that it knows about its current state to only ask questions or offer menu items that make sense given the current situation For example on the surface the first menu item you will see is Turn Off During a dive the Turn Off menu item doesn t appear The second menu item is Calibrate That item only shows on the surface External PPO2 monitoring must be left ON
77. you use a GF setting of 30 85 First your dive computer allows you to ascend until the pressure in your tissue compartments first reaches a GF 0 30 This means your tissue compartment pressure is 30 of the way between ambient pressure and B hlmann s M value Then you sit there until your tissue compartments drop enough pressure so that you can ascend to your next stop How much pressure must leave your tissue compartments before you can ascend Assume you hit your first stop GF 0 30 at 110ft We now have two known points Point 1 is 110 0 30 that is at 110ft we are at GF of 0 30 Point 2 is 0 0 85 that is at the surface we want to be at GF 0 85 A natural way to ascend and this is what Baker did is to create a line from those two known points and ascend in such a way that you never exceed the GF generated by that line Once you determine your two points the formula for the maximum GF at any depth is HighGF LowGF MaxGF HighGF nn Current Depth HighGFDepth LowGFDeptrh But since the high gradient factor is reached at the surface HiGFDepth 0 So HighGF LowGF MaxGF HighGF Current Depth LowGFDepth Version 1 0 41 Prism 2 User Manual Therefore if you hit your first GF 0 30 at 110ft then your LowGFDepth 110 Before you can ascend to 100ft you must let off enough tissue compartment pressure so that when you arrive at 100ft the GF of your tissue compartments does not exceed 0 35 calculated as
78. 2 54 per C Gradual ambient changes in temperature can be maintained within 2 accuracy by processing the signal output through the resistor thermistor temperature compensation network Rapid changes of Version 1 0 21 Prism 2 User Manual 59 F 15 C require 45 60 minutes for the compensated signal output to equilibrate e g the electronic thermistor reacts immediately to offset the change in the sensor but the sensing membrane and electrolyte reacts at a much slower rate Because of the exothermic heat generating reaction of CO scrubbing taking place next to the sensor housing during diving operations it is important that you calibrate the sensors close to room temperatures 60 F 16 C 80 F 27 C so you are not temporarily outside of the 59 15 rapid compensation range while diving How does pressure influence the oxygen sensor s performance Pressure influences the signal output on a proportional basis The sensor is accurate at any constant pressure up to 30 ATM provided the sensor front and rear membranes is pressurized and decompressed gradually similar to human lungs The membranes especially the front sensing membrane do not tolerate rapid change in back pressure or vacuum Normal diving operations will not generate pressures excessive to which the sensor is designed to operate If you use a pressure vessel to check voltage limiting it is important that you slowly bleed off the accrued pressure in the
79. 2 User Manual Post Dive Operations 138 Version 1 0 Prism 2 User Manual The Post dive Checklist Name Date Verify and record batteries Turn off electronics Solenoid battery V Good Replaced secondary display battery V Good Replaced Primary Display Good Replaced Secure secondary Drain counterlungs of fluid Remove CL weights Remove weight pockets weights rinse and hang to dry Soak complete sealed unit in fresh water for 20 minutes if possible or hose off with fresh water Turn off O and drain lines remove tank Turn off diluent and drain lines remove tank Detach Bucket from head record absorbent usage or discard absorbent material Stored for re use Discarded Date packed Size Total hours used Disinfect bucket Inspect O sensors record readings in air Sensor 1 Sensor 2 Sensor 3 Disassemble mouthpiece to counterlung hose assembly disinfect hang to dry Remove counterlungs disinfect hang to dry Drain and hang BCD backplate head assembly in shaded area to dry Review maintenance repair log and address any repairs if required Version 1 0 139 Prism 2 User Manual Post dive Checklist Step by step During the post dive tear down pay attention to each part looking for any damage or wear that
80. 60min 0 5 SEV using 6 12 40F 4 4C 1 35slpm CO 40lpm RMV 60fsw 28msw Install analyzed and properly labeled gas cylinders O Turn on Secondary Display Check cell mV readings in air replace if out of range 8 5mv to 14mv O Setpoint to 0 19 8X menu of left button Oxygen system leak test 3 steps Hold for 30 seconds minimum Open oxygen valve close valve watch oxygen pressure gauge for pressure drop O open oxygen valve Negative Pressure test 4 steps Hold for 1 minute minimum O open DSV BOV O inhale from DSV BOV in CC mode exhaling through nose until counterlungs fully collapsed O close DSV BOV O allow to sit for one minute watch for signs of leaks on Secondary Display PO readings O Positive pressure test 4 steps Hold for 1 minute minimum O close OPV fill loop fully with oxygen using manual oxygen addition valve until OPV engages o allow to sit for one minute watch for signs of leaks on Secondary Display PO readings O open DSV BOV evacuate loop contents Flush loop with 3 steps do this step twice O close DSV BOV fill loop with oxygen until OPV engages O open DSV BOV to equalize pressure to ambient pressure Close DSV BOV Calibrate Secondary Display Electronics 3 steps O menu to calibrate 2X menu of left button press select button right button twice to calibrate O record mV readings in O 1 2 3 acceptable range 40 6mv to 66 9mv 1 LED Primary Display On and batter
81. 73 73 73 74 74 75 75 75 75 75 76 76 77 Tf 71 71 78 78 78 78 78 79 82 83 83 Version 1 0 Prism 2 User Manual Specifications 83 Part 3 Setting Up Your Prism 2 eCCR Packing the Prism 2 CO Scrubber 84 Cleaning your empty scrubber 89 Disposing of used CO absorbent 89 Setting up your Prism 2 using Checklists 90 Why a multi stage checklist format 90 Pre Assembly Packing Checklist 92 Assembly Checklist 94 Operational and Intra Dive Checklist 95 An O Ring Cleaning Primer 98 Numbered Checklist for Training 99 Checklist Items How to 103 Pre Assembly Packing Checks 103 1 Check H Plate Harness Bladder 103 2 Inspect Counterlungs 105 3 Counterlung to DSV BOV hoses 107 4 Inspect DSV BOV 109 5 Inspect Pneumatics 109 6 Inspect Wiring 110 7 Battery Compartment 111 8 Solenoid Operation 113 9 Inspect Head Assembly 113 10 Oxygen Sensors 116 11 Bucket Assembly 117 12 Basket Assembly 119 Assembly Checks 121 13 Fill Scrubber 121 14 Install head assembly onto H Plate 121 15 Install bladder yoke and backplate onto H Plate 121 16 Run pneumatics lines install solenoid gas hose 121 17 Attach Counterlungs to yoke 121 18 Install Counterlung breathing hoses to head 122 19 Attach Gas Supply Lines to Diluent and Oxygen Addition Valves on Counerlungs Bouyancy Device 122 20 Assemble DSV BOV and Hoses Check and Install 122 21 Clean Head to Bucket Sealing Rings 125 22 Clean Red CO Seal amp Secure 126
82. 8 9556 300 44 0 118 9556 358 prade soda lome s Contact Number tor Quality and Specialist information 0044011139 655361 Intersoch uds lat 4 io el and g io 1 mesh www intersurgical cam nio intarsurgical oo_ uk Non Amdicaims Ref MH 1405201012 MNI Versen 1 Product Identification Bram name NI App ictu Said while feurmmed Tram embanatian of ide and Sodom Hye ide STEMTE None CAS applicable ees Miplecular Weipht Not applicable to Chemo Not applicable ro mEes Codex 2181013 2131015 2181021 For niecmuion call OU44 0 11 8965360 2 Composition Information on mgredients CAS No Content Weight mbo 305 62 0 75 80 Er droxide we ni 135 1755 During rg depliedgane chermcabs ag Chemical use 3 Hazards Identiicaton Flammalnlity rating None 22 Version 1 0 203 Prism 2 User Manual 204 Lab Protectrve Pappe Das mask Tecommended General purpose rubber Gopeies Wath after skin contact Mature nf of fee mrure Al Hex phrase for eee of seco to eyes 36 37 70 AER eye TEXIHTAER Y skin 52 Erep at reach of chakl en 526 In case af contact with eyez oin Immecdaely we peny of waler ami medical
83. ALTIIEEE IND EMEHGENUCY HO 800 9279 3300 1427 BAEER EDAD FHHIE ETCH IEFORMATICN 7273 460 2401 VA 22455 7 Dees HAZARDS CHEMICAL NAHE COMA NAME gt u HUMBER PRESENT UNITS ALEYL 214 955 2 Zu 684274 a3 1 uiu HIA DIMETHYL HENZTI AMBION DHLOREETPREE DIHYDEATE LHIARTEENARTY AMPS COMED HYBHBISTALRUONIUM CHLOBTTREE HAZARD EATING 1 HEALTH 1 FIRE FEAT 0 BRERA HAZARBIXHT WASTE We ERIOEITT BOLLUTANTSI DOT HAZAED KM 1 FHYSILAL DATA BHYHILAL EUHIM SOLID TABLET BOILING PT H A AND HHE WHITE HHERLES3 TABLET SPECIFIC GRAVITY N A WATER LOBLE FLASH PRET gt 200 F WILATILES EM VOLATILE MELTING PT gt 125 F 208 Version 1 0 Prism 2 User Manual 4 EXPEC HAZAUM IAEA FLASH POLET EMCE 200 F FLAMMABLE LIHLIJ MEDIA WATER SPRAY CARBO DICAIDE CHEMICAL FOAM SPECIAL FIRE FIGHTING WEE WAL FIRE ABD EXMPIIEIIUHE HAZAED WHE HAZARIKATI THERMAL DECSMECHITICH ERCHHILTTH CARWN WEARI OHIE 23 HBACTIVITE IREA JTARILITY STABLE
84. Check to make sure it is not clogged Place the DSV BOV in your mouth with the valve closed and blow into Y the mouthpiece You should be able to blow air through the drain hole but Fig 288 you will feel some back pressure If you cannot blow air through the drain hole debris may have clogged the hole or become lodged in the drain channel in the rotating stainless steel sleeve You will need to service the DSV c mouthpiece zip tie Check for holes or torn bite tabs in the mouthpiece Replace as needed Check that the zip tie retainer is present and holding the mouthpiece securely onto the DSV BOV d DSV BOV exhalation mushroom valve O W Open the DSV BOV to the CC position Place your palm over the left side opening of the DSV BOV fully blocking it and attempt to gently draw air in There should be no air movement If you are able to draw air in clean the exhalation mushroom valve and seat with water If it Version 1 0 105 Prism 2 User Manual continues to leak after cleaning you must replace the exhalation side mushroom valve and seat then repeat the test e inhalation hose mushroom valve only on inhale side of BOV W BOV ONLY Open the BOV to the CC position Place your palm over the right side opening of the BOV fully blocking it and attempt to gently exhale There should be no air movement If you are able to exhale air clean the exhalation mushroom valve and seat with water If it continues to leak after c
85. ERIES ARE PERFECTLY ACCEPTABLE FOR USE IN TOYS AND FLASHLIGHTS THEY HAVE NO PLACE IN LIFE SUPPORT GEAR AND MUST NEVER BE USED TO POWER ANY COMPONENT OF YOUR PRISM 2 Diagram showing rapid discharge of non branded batteries which in life support gear can result in unnecessary hazards Image courtesy of Rhett Allain Wired The full article Are expensive batteries worth the extra cost is available at www wired com Rechargeable Batteries Because of the potential rapid drop off of charge from rechargeable batteries rechargeable batteries are not recommended for use with your PRISM 2 rebreather and must not be used Note Use of the Prism 2 User Manual This user manual does not nor is it intended to contain any information needed to safely dive with any type of SCUBA apparatus It is designed as a guide for the proper setup operation maintenance and field service of the Hollis Prism 2 CCR only It does NOT take the place of a recognized training agency instructor led diver training course or its associated training manual s and materials This user manual is intended to be used only as a type specific addition to such training and materials and as a user reference This manual cannot be used as a substitute guide for any other type of Self Contained Underwater Breathing Apparatus SCUBA Version 1 0 V Prism 2 User Manual yi Table of Contents Preface Warnings Welcome Foreword Part 1 System Overview Philosop
86. Manual Advanced Configuration Menu The Advanced Configuration sub menu allows changes for values that will not need frequent adjustment The Advanced Configuration is accessed after the System Setup menu page Adv vontig AQV contig 2 Salinity 10O20k0 m3 OC Min PPO Title Dean oc Max PPO2 End Dive Delay 060s CC Min PPO2 SOl Depth Comp OFF Max PPO Fig 218 Fig 219 Figures 217 219 Advanced Config Screens At the top level menu you can either enter the Advanced Configuration or reset the Advanced Configuration values to their defaults Advanced Configuration Page 1 Fig 220 Salinity The salinity setting sets the density of water in kilograms per cubic meter kg m A cubic meter of pure water weighs 1000kg Therefore this value sets the weight of the dissolved Salts in the water For example a value of 1030 kg m means there are 30kg of salts per 1000kg of water Since the depth sensor actually measures pressure this value affects the displayed depth Note that decompression profiles are computed using the actual measured pressure and not the somewhat arbitrary depth Common values 1000 kg m Fresh water 76 Version 1 0 Prism 2 User Manual 1020 kg m EN13319 value Predator default between fresh and salt water 1025kg m to 1035 kg m Salt water varies by location Title Color The title colors can be changed for added contrast or visual appeal Default is Gre
87. N 24 HABS LDOmap kap 760 146 WTE INDIVIIHIAL TABLETS WEIGH 1 2 EACH LUNTATN AN IEGREFIENT THAT TASTES EXTREMELY RITTER ESPECIALLY TO CHILDREN HELE THE CHANTE AFEIDGENTAL OF ENEHIGH TABLETS TO HAEMFUL Version 1 0 209 Prism 2 User Manual ABHITIZING 3OLUTIONAS3 PROMED WITH THESE TABLETS THE STENTRATIOHN LEVEL SPECIFIED BY LABEL DIBECTIONAS3 ABE CONAIDPEHED BE NOH HAZEBIENIS TO MAN THE EHUVIBONMENT WITH BRECGULATIONS OF THE EPA AND THERE CHEMICALS CONTAINED THIS PRODUCT THAT ARE LISTED OH POTENTIAL UCABCINOGENAG UNDER THE PROS AM I HU 5 OB Tie 7 SPILL DE ea THIS PRODUCT BEING IN SOLID TABLET FORM HOT INUOLUVE THE OF SPILL OH LEARNS ASSCELATED WITH HANDLING LIQUIT FOWDEHET PHROTWITIA WEITE IISEPXIAL METHOD THIS PRORUCT I3 INTENDED USE IN COMMEHRBUCIRI INSTITUTIONAIL DISHNASGHING OPERATIONS AND MAY DISARMED WITH WATER INTO THE 3EMAGL PRODUCT BIODEGRAIARBLE DO HOT HEUSE EMPTT CONTAINER AED PUT IN TRAJE ACHE WEITE CLASS HEASEBIENIS EMHTTIUM H SPECIAL BST IOS EARL IMFTEUMATIUM PRO
88. O Sensor holders Tools Needed None Each of the three O sensor holders are held in place by 2 pins molded into the head assembly They are made of a soft silicone Remove the holders from their pins and clean with warm soapy water then rinse off and allow to air dry During annual service these will be checked to see if they are beginning to harden and will be replaced as necessary Do not attempt to repair a torn cell holder O Sensor Harness Tools Needed None Use one drop of Deoxit Gold electrical contact cleaner on the contacts and wipe off any excess contact cleaner before re installing the harness in the head If the wiring is showing excessive oxidations or the insulation is cracking replace the harness O sensors Tools needed Cell checker Each sensor should be checked periodically during its service life for linearity and voltage limiting using a cell checker If you do not have one contact your local Hollis Prism 2 dealer for assistance For further information see the article on O sensor care in this manual Version 1 0 173 Prism 2 User Manual Inhalation Counterlung hoses Tools needed Oeteker clamp pliers Large Bottle Brush Tribolube Every ten hours of use you should scrub the inside of the counterlung hoses with a bottle brush and Steramine First remove the hose from the counterlung by removing the 2 Oeteker clamps holding it in place This will insure that any debris scrubbed from the hose will not simply se
89. PPO will show three values Shows the current setpoint which is the PPO at which the Secondary assumes the breathing loop is being maintained Displays 3 sensors Displays PPO in Yellow when sensor is voted out Displays FAIL when calibration is not valid When in OC mode the sensor values continue to display This shows the state of the breathing loop but not what is currently being breathed Version 1 0 35 Prism 2 User Manual 36 Fraction Inspired O FiO Fig 44 The fraction of the breathing gas composed of O This value is independent of pressure Ascent Bar graph Fig 45 47 Imperial Shows 1 bar for every 10 feet per minute fom of ascent rate Metric Shows 1 bar for every 3 meters per minute mpm of ascent rate Green when 1 to 3 bars Yellow when 4 to 5 bars and Flashes Red when 6 bars or more Battery Symbol Fig 48 49 When the battery is good the battery symbol does not display Displays Yellow when the battery needs to be changed Flashes Red when the battery is dangerously low and must be replaced immediately Depth Fig 50 Shows the depth in the currently selected units feet or me ters Meters are displayed with 1 decimal place up to 99 9 meters Feet are never displayed with a decimal place Note If the depth shows a Flashing Red zero then the depth sensor needs service Fig 51 Dive Time Fig 52 The length of the current dive in minutes Does not display when not
90. TECTION HO PHOTE IIVE CLOTHIEHG GLJIVE3 VEHTILATION HG EYE PROTECTION WG OTHER HANDLING PHECRUTIONS UT OF BEACH OF CHILDREN ASTOBAGE STORE DAY PLACE REEP CONTAINEB WHEN HOT IN USE Ik FUOD BY STOBAGE OF DISPOHAL Ti F BARA TITLA III THIS PHODCT NOT SURJECT TO THE TOEIC CHEMICAL REPORTIBG BEQUIIBEMENTA3 OFABECTION 313 TITLE III OF THE 3UPEHFUHI AMEHIBEENTAO AND BEBUITHOBIZATION ACT 1985 40 PART 472 210 Version 1 0
91. TRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR INSTRUCTOR By initialing each skill above the student and instructor certify that the listed skill can be completed with mastery and no further remediation is required to move onto the the next skill The student also certifies by initialing the skill theat he she will continue practicing the skills after formal training has been completed Student Version 1 0 Instructor 165 Prism 2 User Manual The Language of Oxygen When we talk about getting oxygen fills for our rebreathers we speak about different grades of oxygen such as medical grade aviation grade and welding or industrial grade Since we know from high school chemistry that oxygen only has one box on the periodic table what do these different grades of oxygen signify To start off the conversation intelligently we have to understand that different countries have different methods and nomenclatures for designating grades fit for a particular purpose There is no sense going to all the trouble to purify or certify oxygen for medical use that is destined for a welding machine is there Being that the United States is the Prism 2 s home country we might as well talk about the way things are done here The first thing to clear up is something that is heatedly debated on internet forums and that is Is oxygen a controlled substance in the United States requiring a prescription to get a cylinder filled The answer as wit
92. a Solenoid Alert occurs TIME STOP TIM After user confirms the small red 4 text persists as long as the solenoid alert condition remains DEPTH TIME STOP TIME 5 If Ext V is viewed it appears in red Ext V Int V USE ONLY NAME BRAND BATTERIES DURACELL EVEREADY etc OFF BRAND DISCOUNT BATERIES HAVE NO PLACE IN LIFE SUPPORT GEAR AND MUST NEVER BE USED TO POWERANY COMPONENT OF YOUR PRISM 2 See full battery warnings on page V 50 Version 1 0 Prism 2 User Manual Switch Setpoint When SELECT is pushed with either of these displays the displayed setpoint on the right will be selected Fig 114 During a dive the Switch Setpoint menu item will be the first item displayed The Turn and Calibrate displays are disabled Fig 114 115 Fig 115 Version 1 0 51 Prism 2 User Manual Select Gas Fig 116 This menu item allows you to pick a gas from the gases you have created The selected gas will be used either as the diluent in closed circuit mode or the breathing gas in open circuit mode Gases are always sorted from most to least oxygen content Press the SELECT button when Select Gas is displayed and the first available diluent gas will be displayed Fig 117 Use the MENU button to increment the diluent gas to the one you want then press the SELECT button to select that diluent gas Fig 118 If you increment past the number of gases available the display
93. a sufficient quantity of oxygen to support human life The breathing gas within the Hollis Prism 2 loop must be closely monitored and manually maintained with a safe oxygen content by you a properly trained and alert user at all times The computer controlled addition of oxygen to the breathing loop is intended only as a fail safe back up system to you the primary controller If you either knowingly or by inattention allow the computer to control oxygen addition to the breathing loop at any time you are diving outside the principals of your training By abdicating user responsibility and system control to a machine whether intentionally or not you assume all risk to life and limb that may result WARNING High Pressure Oxygen The Prism 2 uses cylinders gas feed lines pressure gauges and other devices which will contain pure oxygen at high pressure when in operation Oxygen by itself is non flammable however it supports combustion It is highly oxidizing and will react vigorously with combustible materials Oxygen at elevated pressure will enhance a fire or explosion and generate a large amount of energy in a short time The user must maintain all parts of the Prism 2 that can come into contact with high pressure oxygen as oxygen clean components This includes scheduled servicing by a Hollis service professional and using approved oxygen compatible lubricants on any part of the pneumatic systems that will come into contact with high pre
94. add one short burst of gas by depressing the button on the valve Cycle your breathing approximately 5 times while watching the readout of the 3 oxygen sensors on your secondary display Continue to add oxygen and repeat the breathing cycle until the desired PO has been reached Be extremely conservative when manually adding oxygen to your loop as it is essential that you do not add too much oxygen Remember a PO above 1 4 should not be used under normal circumstances Also manually adding oxygen during descent should be done quite conservatively if at all as your PO will increase simply by going deeper Skill 9 Minimum optimal loop volume and the over pressure valve OPV The loop over pressure valve is located on the front right exhale counterlung It is designed to purge excess gas pressure from the loop automatically such as during ascent from depth when the volume of gas in the breathing loop is increasing The OPV should be continually adjusted as needed throughout a dive to maintain minimum loop volume To decrease the sensitivity of the OPV thereby increasing the pressure and volume of gas inside the breathing loop turn the OPV valve clock wise several clicks To increase sensitivity and purge excess pressure and volume rotate the OPV counter clockwise several clicks Your body position in the water will have an effect on the OPV If you are in a horizontal diving position the static loading on the OPV will be less than if y
95. ake sure you are not accidentally breathing in and out of your nose If you do wear a scuba mask make sure a buddy is close by and able to remove your mask should you become incapacitated Breathe normally frequently looking at your primary and secondary display Manually add oxygen as needed to keep your loop PO slightly above its low setpoint thereby conserving the solenoid battery Monitor yourself for signs of carbon dioxide build up such as rapid breathing shortness of breath or feelings of air starvation dizziness confusion uneasiness or irritability and finally unconsciousness Also monitor the loop for excessive work of breathing or strange smells or taste If any of these issues present themselves bail off the loop immediately and look for the cause of the problem After breathing from the loop for a bit shut down the DSV BOV and continue your last minute pre dive preparations If you have to make any adjustments to the unit after discovering and resolving an issue re run your checklist and complete another pre breathe prior to entering the water Version 1 0 147 Prism 2 User Manual Skill 1 The in water bubble check During your pre dive checks you immersed your Prism 2 in water for a preliminary bubble check Now you will complete your primary bubble check this time with a buddy when you are in the water and ready to dive This primary bubble check is critical to insure no part of the breathing loop has been compromi
96. all systems are go prior to entering the water It is unlikely that even a 5 minute pre breathe can identify a problem with the absorbent or even verify that you have installed the absorbent basket in the loop So don t allow a pre breathe regimen to lull you into a false sense of security Remain vigilant especially during the first few minutes of a dive for any signs or symptoms of CO buildup and bailout to OC at the first hint of trouble To do a proper pre breathe block your nose by pinching it and remain securely seated throughout the pre breathe while constantly monitoring and maintaining a safe loop PO 136 Version 1 0 Prism 2 User Manual a check ADV operation Automatic and manual Breathe the loop down breathe in from mouth exhale from nose while watching the diluent SPG until the diluent addition valve fires The SPG needle should not move Now depress the ADV body until the valve fires This will lower the loop PO and may lower it enough to cause the electronics to fire the solenoid see next step Continue breathing from the loop b solenoid oxygen addition If the previous step brought the loop PO low enough that the solenoid fired to raise the PO back to setpoint this step can be considered completed If it did not you can continue to breathe from the loop until you metabolize enough O to cause the solenoid to fire Do not assume that the solenoid will fire Watch your PO on the Secondary Display Continue breath
97. alves Fig 265 If your rebreather is equipped with a Hollis 410 Inflator Alternate Air Source To test the Hollis 410 you will need to temporarily install a diluent tank onto the diluent pneumatics and charge the system Fig 266 Fig 266 Version 1 0 99 Prism 2 User Manual Breathe from the alternate air source to verify that it works correctly DO NOT simply depress the purge button as that will not reveal if the second stage diaphragm is intact and properly seated If your initial exhalation is met with resistance that usually indicates that the second stage was not rinsed sufficiently with fresh water after use and the exhalation mushroom valve has become stuck to its seating surface Soak the alternate air source in fresh water for at least 20 minutes to remove all salt and other residue and test again e dump valve s O W Inspect the buoyancy compensator dump valves Momentarily open each valve and let a bit of air from the buoyancy compensator out to make sure they open and close freely Also inspect the air dump pull cords Fig 267 to make sure they are in good condition and not entangled hA pe E Dn f removable weight pockets W 1 if installed Verify that you have 2 weight pockets Fig 268 Check that their Velcro flaps quick lock and the pull handles in good working condition Secure them in place Field Notes Integrated weight pockets are one of the most frequently lost or left be
98. and the DSV BOV still in your mouth shut down the DSV BOV Do not allow air back into the loop while shutting down the DSV BOV Allow to sit for one minute watch for signs of leaks on Secondary Display PO mV readings After you pull a slight vacuum on the loop the counterlungs will be fully collapsed and hard to the touch Fig 340 Allow the loop to sit for at least one minute while you watch the Secondary Display mV or PO readings for a change and or watch the counterlungs to see if the fabric appears to relax Fig 341 If the loop does appear to be losing vacuum you must track down and fix the leak or leaks prior to diving Leaks that only show up in negative pressure tests but not positive pressure tests are rare However they are the hardest to find because you cannot do a simple bubble check to find them Usually they are the result of a counterlung drain locking collar not being tightened which could cause the negative pressure in the loop to open the valve and allow air in This problem would not occur during diving Make sure both counterlung drain locking collars are shut tight Fig 342 Another possibility is debris in the OPV mushroom valve or seat A flush with fresh water might remove the material creating the leak Worn O rings in the DSV BOV may also show up in the negative leak test Never dive a Prism 2 that shows signs of a leaking loop as that could compromise the integrity of the loop possibly leading to injury or d
99. ange and the bucket mount Screw the hose fitting onto the solenoid and tighten with a small crescent wrench 17 Install bladder yoke and backplate onto H Plate 4 steps a Long carriage bolt on top short carriage bolt on bottom Secure with nylon keepers Install the longer of the two carriage bolts 1 1 2 on the top square bolt hole and secure it in place with a nylon bolt keeper Install the shorter 1 carriage bolt on the bottom square bolt hole and secure it in place with a nylon bolt keeper b install bladder on H plate inflator facing H plate Carefully install the bladder onto the 2 harness mounting bolts of the H plate making sure that the inflator mechanism is facing the H Plate Take care to not accidentally push the mounting bolts out of the nylon keepers as you run the bolts through the bladder mounting holes c install yoke harness fastex clips facing bladder Place the counterlung yoke on top of the bladder with the plastic Fastex clips facing the bladder Take care to not accidentally push the mounting bolts out of the nylon keepers as you run the bolts through the yoke mounting holes d install backplate and harness place washers and tighten butterfly nuts Place the backplate and harness carefully on the two mounting bolts and secure the assembly in place using the two stainless steel washers and butterfly nuts Tighten the butterfly nuts by hand 18 Attach counterlungs to yoke 3 steps a insure inhale coun
100. approved alterations to functional parts will automatically void all factory warranties and no repairs or service work will be performed by any Hollis service professional until the altered Prism 2 unit is brought back into factory specifications by a Hollis service professional at the owner s expense N WARNING Computer controller specific warnings This computer is capable of calculating deco stop requirements These calculations are predictions of physiological decompression requirements Dives requiring staged decompression are substantially more risky than dives that stay well within no stop limits Diving with rebreathers and or diving mixed gases and or performing staged decompression dives and or diving in overhead environments greatly increases the risks associated with scuba diving WARNING Computer Software Never risk your life on only one source of information Use a second computer or tables If you choose to make riskier dives obtain the proper training and work up to them slowly to gain experience Always have a plan on how to handle failures Automatic systems are no substitute for knowledge and training No technology will keep you alive Knowledge skill and practiced procedures are your best defense Version 1 0 iil Prism 2 User Manual WARNING User packed radial scrubber As of this writing the Hollis Prism 2 design does not include any technology or other device which can detect or warn of potentiall
101. ar to the buddy check you learned in your first open circuit diver course with a few additions The most obvious addition is that you will have to verify multiple gas sources Lets quickly review the steps of your standard equipment check and add in the rebreather specific items B Buoyancy Device Check that all dump valves work inflator is hooked up and working and the buoyancy device is holding air not leaking W Weights Make sure the detachable weight system is in place and secure do not forget counterlung weights Field Notes Defining proper weighting With all weights installed in your rebreather you should float at eye level with minimum loop volume see Field Notes Minimum maximum and optimal loop volumes and work of breathing on page 155 in your counterlungs holding a normal volume of air in your lungs Upon exhaling out of your nose you should begin sinking For further information on weighting the Prism 2 refer to the article Stability on page 18 R Releases Make sure all attachment points are secure including tank straps and you are familiar with their operation Verify there are no entanglement issues and no hoses or other equipment are crossed over the front of the diver making quick removal of equipment more complicated Gasses This is where you will notice a departure from your open circuit class Verify all gas supply tank valves are open and all gauges are showing full tanks Verify
102. as a derivative control method If a controller starts from a stable state at zero error then further changes by the controller will be in response to changes in other measured or unmeasured inputs to the process that impact on the process and hence on the process variable Variables that impact on the process other than the manipulated variable are known as disturbances Generally controllers are used to reject disturbances and or implement setpoint changes Changes in feed water temperature constitute a disturbance to the faucet temperature control process In theory a PID controller can be used to control any process which has a measurable output a known ideal value for that output and an input to the process that will affect the relevant process value PID controllers are used in industry to regulate temperature pressure flow rate chemical composition speed and practically every other variable for which a measurement exists A Typical Solenoid Loop Feedback Circuit Source Wikipedia Version 1 0 13 Prism 2 User Manual Bucket latches There are 4 Nielson Sessions 300 series Stainless Steel locking latches mounted on a stainless steel band Fig 28 that hold the bucket securely onto the head assembly While two latches will hold the bucket securely it was felt that redundancy here was critical Fig 28 Basket spring on bucket The absorbent basket is pressure sealed onto the Red CO2 Seal under the head by the bu
103. as built up in the threads is to soak the top and basket threads in 100 white vinegar for 10 to 15 minutes If time is an issue heat the vinegar to 100F 38C and soak the parts Rinse thoroughly and dry the basket before re packing it While in use you can use a small flat head screwdriver to clean the threads Warning If you use a screwdriver or a dull scraping tool to scrape away caked on absorbent from the basket top threads be very careful It is very easy for the tool to accidentally slip on the threads and tear the mesh your skin or both d top and bottom foam pads 1 The foam pad with the larger diameter center hole is placed on the bottom of the basket prior to filling Fig 314 The second pad goes on top of the absorbent filled basket under the basket top Both the bottom and top pads are used to impede any laminar flow of gas which might occur along the smooth surfaces of the basket top and bottom After many uses and cleanings the foam pads will begin to deteriorate and the pads will start to become thin At this point you must replace the pads Fig 314 Version 1 0 117 Prism 2 User Manual Prism 2 Assembly checks 13 Fill scrubber basket with CO2 absorbent amp store in an airtight container Label container Grade date filled user time used Date packed Grade Time Used Time left maximum scrubber duration 260 minutes 0 5 SEV CO2 using 6 12 40F 4 4C 1 35slpm CO2 40lpm 60fsw 28msw Fill t
104. as flows up through the scrubber basket flow vanes Fig 8 This restriction creates higher gas velocities in the sensor area further dropping the dew point of the gas prior to reaching the oxygen sensor faces By using natural condensation along the surface of the bucket wall and manipulating gas velocities in the area around the O sensors we are able to keep the sensors as dry as possible The inhalation side counterlung The inhalation counterlung Fig 9 houses the automatic diluent addition valve ADV Having the ADV on the inhalation side of the loop makes sense for several reasons Should the loop contents ever become questionable or the diver begins feeling abnormal flushing the loop with a known normoxic gas is always recommended while switching to bailout Therefore having the diluent as close to the mouthpiece as possible is the best way to insure that fresh breathing gas of known and safe oxygen content is only a breath away Not applicable if the diluent is a hypoxic mix 6 Version 1 0 Prism 2 User Manual The hose attaching hardware for both the head and DSV BOV assembly attaching points Fig 10 are welded into place so they cannot come loose and cause an unintended loop flood The DSV hose attaching hardware is a keyed part Fig 11 and will only accept the correct hose assembly elbow thereby avoiding incorrect assembly of the loop Behind each lung under the Fastex Buckle panel are weight po
105. as with the highest PPO less than 1 6 and recal culated the decompression based on the new profile Fig 103 At 20 feet one push on MENU brings up select gas Fig 104 A push on SELECT enters the select gas menu and another SE LECT picks the O Since the gases are sorted by oxygen content O is the first gas offered Fig 105 Version 1 0 Prism 2 User Manual Fig 99 Fig 100 Fig 101 Fig 102 Fig 104 47 Prism 2 User Manual Menu Reference Turn Off Fig 106 The Turn Off item puts the computer to sleep This menu item will only appear if the water contacts are dry on controllers While sleeping the screen is blank but the tissue contents are main tained for repetitive diving The Turn Off menu item will not ap pear during a dive Turn off time is user selectable in the Advanced Configuration menu Fig 106 Calibrate Fig 107 This will calibrate the sensor displays to oxygen Flood the breath ing loop with pure oxygen SELECT with Calibrate in the display and the confirmation message will display On the top line the mil livolt reading will show Good sensors should be in the range of 35 60 mV at sea level in 100 oxygen The allowable millivolt range for calibration in the computer programming is 30 70 mV This Fig 107 scales with percentage of oxygen and barometric pressure Pressing the MENU button will prevent the calibration Pressing SELECT will cali
106. athe from this I didn t think so Make it your habit to disinfect your breathing loop after each dive day and you will never have to think about this again Drain and hang BCD backplate head assembly in shaded area to dry Drain any water that might have collected in the buoyancy device then hang the unit core to dry somewhere away from direct sunlight and allow the fabric to dry Fill out maintenance repair log and address any repairs if required Any items which you notated in your maintenance repair log during the post dive breakdown should be reviewed and the parts in question re examined closely and repaired or replaced as required If parts are used from your spares kit make sure to notate that so you can re order replacements from your local Hollis Prism 2 dealer Version 1 0 143 Prism 2 User Manual Prism 2 eCCR Maintenance Repair Log Owner Date of report Reason for maintenance check one Pre Dive Failure Post Dive Maintenance Preventative Scheduled Maintenance JPart Replaced Reason Parts needing service Action Operational Observations Replacement Parts need to be ordered to complete this maintenance Date Part s ordered Expected delivery Signed 144 Version 1 0 Prism 2 User Manual Part 4 In Water Ski S Version 1 0 145 Prism 2 User Manual Prism 2 water skills and drills Pre Dive Equipment Check The rebreather equipment check is simil
107. battery voltages at the same time 38 Adjust user selected low high set points to desired settings 0 4 1 5 3 steps The Secondary Display has user programmable low and high setpoints The default low setpoint is 0 ata O The valid range for low or high setpoints 0 4 1 5 Page 53 54 contains full details on how to program setpoints a menu to dive setup Depress the menu left button until you come to the dive setup screen Fig 352 b menu to edit low set point low set point Press the select button right to enter the edit low SP screen Fig 353 Press the select button again to edit the low setpoint value Pressing the menu button will change the value incrementally and continue to roll over until a value is saved using the select button Version 1 0 133 Prism 2 User Manual c menu to edit high set point high set point Press the select button right to enter the edit high SP screen Fig 354 Press the select button again to edit the low setpoint value Pressing the menu button will change the value incrementally and continue to roll over until a value is saved using the select button 39 Diluent system leak test 2 steps This test will determine if there are any leaks in the diluent system a turn off diluent tank valve b watch gauge for pressure drop Watch the diluent pressure gauge for at least a minute looking for any pressure drop If the diluent pneumatics are slowly losin
108. brate the sensor displays The displays should now all read 98 If any display shows FAIL the calibration has failed because the mV reading Is out of range Fig 108 109 The system defaults to a calibration gas of 98 oxygen This is to compensate for the difficulty in completely filling the loop with 100 oxygen and also to allow for water vapour If you are using a cali bration kit with no water vapour and 100 O you can set the cali bration gas to 100 It can also be set to other values if pure oxygen is not available The calibration takes into account the altitude at which the comput Fig 109 er was turned on For example if the altitude was 885 mBar or 87 then with a 98 calibration gas the sensors would calibrate to 89 The Calibrate menu item will not display during a dive 48 Version 1 0 Prism 2 User Manual Calibration Problems Here are some common calibration problems In this display one sensor is flashing yellow This shows that the sensor is voted out If it comes back within range it will be voted back in stop flashing yellow and return to green Fig 110 A failed sensor is a different situation In this case the sensor failed calibration Changing the sensor won t make it register again Once a sensor has failed calibration the only way to bring it back is to suc cessfully calibrate If the computer were to display a value with a new sensor it would be a meaningless va
109. ce electricity as the O sensor does and the O sensor does not store electrical energy as a battery does Understanding that the O sensor is more like a delicate power generating machine than a robust Duracell D battery is your first clue in understanding how they should be handled What materials are used to manufacture the Analytical Industries PSR 11 39 MD sensors The body of the sensor is made of High Density Polyethylene HDPE The membrane on the front of the sensor is a thin Teflon gas permeable membrane The internal components are comprised of a lead anode a precious metals plated cathode a base pH electrolyte consisting of mostly water and a bit of Potassium Hydroxide A printed circuit board PCB with resistor thermistor temperature compensation circuitry is heat sealed to the outside back of the sensor What environmental conditions are best and worst for the O sensor Your series sensors are happiest between 32 F 0 C and 122 F 50 C Operating or storing the O sensor above 122 F 50 C will prematurely dry out the electrolytic fluid and destroy the sensor Operating or storing the O sensor below 32 F 0 C will freeze the electrolytic fluid causing expansion damage to the Teflon membrane and possibly leakage of the electrolyte upon thawing thereby destroying the sensor How does changes in ambient temperature influence the O sensor s performance Temperature influences the signal output at a rate of
110. ck Vann for their final certifi cation dive Prism 2 User Manual Part 1 System Overview Matthew Addison Indo Steps Version 1 0 1 Prism 2 User Manual Design Philosophy The Prism family of rebreathers has a long and illustrious history and it is considered one of the foundation platforms of the modern day electronically controlled sport rebreather The Prism 2 like its forerunner the Prism Topaz is a digitally controlled electronic closed circuit rebreather with split front mounted over the shoulder counterlungs It incorporates a radial design scrubber for the best possible duration and work of breathing All gas delivery systems on the Prism 2 have both automatic and manual function as well as an option for a Constant Mass Flow orifice classing it as a hybrid type rebreather hCCR Manual Control or Computer Control One of the ongoing debates when discussing rebreather safety is whether manually controlled or electronically controlled rebreathers are safer From the day in 1995 when Prism Topaz class 1 was held in Hermosa Beach CA students were taught to fly their rebreathers manually by watching their secondary analog displays and manually injecting oxygen and diluent as needed From day one Prism students were taught that the primary control system was always the divers brain It wasn t until the last dive of the last day of class that students were told OK you can turn on your electronics an
111. cket spring assembly Fig 29 at the bottom of the bucket The spring creates the seal between the basket and Red CO2 Seal and also reduces vibration on the basket during transit Absorbent basket assembly The absorbent basket is comprised of five main pieces Fig 30 The basket outer cage that supports the nylon absorbent retaining mesh a screw in center tube which also supports the nylon mesh and a screw on cover Two foam pads must be installed top and bottom prior to filling the absorbent basket The bottom pad has a larger center diameter hole than the top pad The foam pads impede the flow of gas against the smooth surfaces of the basket top and bottom hindering any potential gas channeling in these areas 14 Version 1 0 Prism 2 User Manual The gas flow vanes built into the top of the scrubber basket create an area of increased gas velocity within the sensor area of the head reducing the dew point of the gas around the sensors The reduction in condensing humidity in this critical area helps reduce the potential for water to condense on the surface of the hydrophobic membrane of the O sensor Backplate The Hollis Prism 2 can be outfitted with an industry standard technical style backplate The user can specify either a stainless steel Fig 31 or anodized aluminum backplate when ordering their rebreather The style of threading the webbing for the backplate is left to user preference Fig 31 O and Diluent
112. ckets Fig 12 which will accept up to 5 Ibs 2 3kg of hard or soft weight The weight pouch flap is held in place by Velcro There are 2 D rings on the counterlung one on the side and one at the bottom Each Counterlung has a water drain at the bottom of the lung Fig 13 to drain fluids as they accumulate during a dive The Faxtex clip panel on the back of the counterlung contains 2 fastex clips for clipping the counterlungs to the harness and one chest strap with clip Fig 12 Fig 13 The exhalation side counterlung The Exhalation side counterlung is of similar build to the Inhalation side counterlung in all respects excepting it houses the manual oxygen addition valve and the automatic adjustable loop over pressure valve OPV Fig 14 Inhalation Hose and hardware Fig 15 The Inhalation hose is a 15 X 11 fixed length rubber breathing hose The Inhalation hose hardware which connects the hose to the DSV BOV and counterlung also houses the inhalation mushroom valve on the DSV BOV side of the hose The mounting hardware is held in place by 2 Oeteker clamps on each side Version 1 0 7 Prism 2 User Manual DSV Dive Surface Valve The Dive Surface Valve Fig 16 is a neutrally buoyant one way loop shut down valve with a water purge The rotating barrel is made of stainless steel The exhalation mushroom valve is seated on the right side of the valve housing See exploded diagram Fig 18 on facing page
113. counterlungs wing and our exposure suit on ascent is critical Adding or removing small amounts of gas and allowing time for the change to take effect is the key to controlling our buoyancy Fig S2 S3 Fig S2 Counterlung position should be such that they are as close to your lungs as possible both in the vertical and horizontal planes Fig 54 This will minimize static lung loading and decrease the work of breathing The bottoms of the counterlungs should be secured to the waist strap to hold them in place when they are inflated and become buoyant For most divers the elbows on the counterlungs should be positioned at the collarbones with the chest strap tightened to control their horizontal position Gas volume in the counterlungs will affect both your buoyancy and trim Too much gas in the counterlungs will result in head up trim too little will result in head down trim and difficulty taking a full breath With practice one can become proficient at adding and removing gas from the breathing loop to maintain horizontal trim and neutral buoyancy The wing may be positioned to increase buoyancy towards our head or our feet if needed to adjust our trim Weights can be placed near the shoulders to provide a counterbalance to the counterlungs and help keep us prone in the water with minimal effort Version 1 0 19 Prism 2 User Manual The backplate should be positioned such that the top of the plate is easily reachable with
114. creational technical gt M CCR and bring that product to market It has a long pedigree me based on one of the first recreational rebreathers available that is still here today made by a company with over 40 years in the scuba industry EU WO We hope you will enjoy your transition into the world of CCR Diving Welcome and Enjoy Sharon Readey March 2012 Pete in Phibian CCS 1993 4 Cornwall UK After chamber tests in Nov 1993 of the PRISM SCR and Phibian at DDRC this prototype was put together for the DEMA Tek shows Version 1 0 XV Prism Topaz photographs All Photos courtesy of Steam Machines Inc T b m EE m e E y Kermit Back view Prism nicknamed Kermit Front view Photo Matt Elder Photo Matt Elder Pre breathing the rig Manned Testing of the Prism Invader at NEDU 2002 Pete hanging in the green of Gold diggers Quarry Cornwall wearing a Prism semi closed RB Photo Dan Burton LEES WEE ME 3 1 Peter diving an early Cochran Electronic Prism in 1995 op American Diving s Prisms Bottom Kevin Rottner with analog meter Photo Robert Landreth Photo Wes Skiles Above Pete and his son Christian onadive inLa Paz Mexico Photo Kenny Schneider Below Manned testing of the Prism Invader at NEDU 2002 ED S Se we aring a Invader a militarized Topaz Photo Peter Readey Peter taking Dr Neil Polack and Dr Di
115. ct course of action for an O feed malfunction is for the diver to bailout to open circuit and abort the dive Skill 19 leak detection Disconnecting quick disconnects underwater Diluent Pneumatics There are two quick disconnects on the diluent side of the rebreather One is on the ADV and the other on the inflator Should either system begin leaking you can disconnect the gas feed hose If the leak is in the ADV and disconnecting and reconnecting the hose does not correct the problem you must end the dive rather than continue diving with the ADV hose disconnected 162 Version 1 0 Prism 2 User Manual as that could allow water to enter the loop which could lead to a loop flood If you must stay on the loop you may feather the diluent cylinder valve open valve only when gas injection is required O Pneumatics The one quick disconnect on the O side feeds the manual oxygen addition valve By disconnecting the manual O addition valve hose you can diagnose whether the O leak into the loop is coming from the solenoid or the manual O addition valve as these are the only two oxygen paths into the breathing loop Disconnect and reconnect the hose If you have a leak on the oxygen side of the system you must bail out to open circuit while you deal with the problem If you cannot correct the problem stay on bailout leave the O manual addition valve disconnected and abort the dive Warning Loss of gas containment If your
116. d experience a computer controlled dive Diving with the computer monitoring the oxygen and the user keeping an eye on everything with at that time a wrist mounted primary display and analog secondary sure kept us busy but we quickly realized that the computer was a LOT better at closely maintaining a set point We also realized that our instructor had trained us to be manually controlled rebreather divers with the safety of computer over watch Why two independent monitoring systems one rebreather Simply put electronics batteries and wiring combined with salt water or even fresh water do not work well together While we can seal circuit boards and wiring interfaces against water intrusion rebreathers should have a diver accessible compartment to change batteries and because of this need for accessibility flooding can occur This is the Achilles heel of rebreathers with on board electronics Any time an O ring sealed Compartment is unsealed the potential for debris to get on the O ring and cause the compartment to flood during the next dive is increased So with two separate systems onboard with separate battery compartments if one battery compartment floods and destroys the battery we simply switch to the other monitoring system to safely end the dive When our dive is over we dispose of the wiring harness and battery clean the compartment and put in a fresh battery and new O ring s 2 Version 1 0 Prism 2 User Manual
117. d time to surface e Battery voltage Pressure Date and time e Surface interval Serial number and version number Basic Setup Before using the computer there are several things that need to be configured This is not an exhaustive list of the prerequisites for diving the system but a suggestion of key tasks Calibrate the oxygen sensors In the System Setup menu set the units to metric or imperial also set the date and time Enter the gases that you will use for the closed circuit portion of your dive and or enter the gases for you will use for open circuit The system will use the gases that are available in the order of oxygen content during the Time To Surface TTS prediction The system will use the next available gas that has a PPO of less than 1 0 for closed circuit diving If the computer is switched to open circuit during a dive the system will calculate the TTS based on the configured open circuit gases that are available It will use the next available gas that has a PPO of less than 1 6 for open circuit diving NOTE These gases are used automatically only for TTS predictions The gas used to calculate the current tissue load and the current ceiling is always the gas actually selected by the diver Version 1 0 Prism 2 User Manual Display Elements Descriptions Closed Circuit Partial Pressure of O PPO The Secondary will Flash Red PPO when less than 0 4 or greater than 1 6 Shows internal sensor
118. diant heat Caution There are no user serviceable parts inside the Secondary Display Do not tighten or remove the faceplate screws Service of the Secondary Display may only be done by a Hollis authorized service cen ter Specifications Atmospheric Range 800 1050 mBar Transducer Depth Range 14ATA Transducer Depth Accuracy 2 5 Depth of Dive Time Start 1 6m of Sea Water Depth of Dive Time Stop 0 9m of Sea Water Operating Temperature Range 4 C to 32 C Short Term hours Temperature Range 10 C to 50 C Long Term Storage Temperature Range 5 C to 20 C Crush Depth Limit 185m Weight 0 4 kg Recommended Battery SAFT LS14500 3 6V Lithium 2250mAh AA Size Battery Operating Life Display Medium Brightness 100 Hours Plus 1 Year Standby Version 1 0 83 Prism 2 User Manual Part 3 Setting up your Prism 2 eCCR a Shark Feeder Cave Diving Instructor Prism Diver Matthew Addison and Women Divers Hall of Fame Member Cristina Zenato Ben s Cavern Grand Bahama 84 Version 1 0 Prism 2 User Manual Packing the Prism 2 CO Scrubber To pack your Prism 2 scrubber you will need the following items Fig 245 1 towel Paper towels or newspaper sheets 1 ea top and bottom absorbent basket foam pads Approximately 6 Lbs 2 7 Kg fresh unused 8 12 CO absorbent 1 pair surgical gloves 1 5 or surgical mask 1 eye protection Fig 245 Warning If you ever in
119. display and add gas as needed to maintain your new setpoint Skill 15 Clear water from hose Since learning skill 3 DSV BOV shutdown you have become quite proficient at closing your DSV BOV before removing it from your mouth underwater and on the surface In a perfect world that would be the end of it Water would never enter your breathing loop But this world isn t perfect and neither are the divers around you Someone some day may accidently kick that DSV BOV out of your mouth You however will NEVER remove an open DSV BOV from your mouth right Because through all that practice you are now perfect Accidental flooding is not the only way to get fluids into your counterlungs If your dive is long enough you may find that water has entered the loop around your lips and enough has drained into your exhalation counterlung that you hear bubbling in the exhale counterlung whenever you manually add oxygen Water leaking around your lips is normal and does not mean that you should chastise yourself for allowing a small amount of water into the loop Even through normal breathing the moisture in your exhaled breath will condense in the exhale hose and collect in the bottom of the exhalation counterlung as a viscous fluid mix of saliva salt water and fresh water On your instructor s signal remove the DSV BOV from your mouth with the valve open and the mouthpiece facing downward remember to blow any bubbles when the mouthpiece is out of
120. diving Stop Depth and Time Fig 53 Stop the next stop depth in the currently selected units feet or meters Time the time in minutes to hold the stop Will Flash Red when you ascend shallower than the current Stop Fig 54 Note on 10ft 3m last stops The Secondary uses 10ft 3m last stops You may perform 20ft 6m stops with no penalty since the Secondary Display is always calculating tissue loading at your actual depth The only difference is that the predicted time to surface will be shorter than the actual TTS since off gasing is occurring slower than expected Fig 45 47 Fig48 49 F g Fig 52 Fig 53 Fig 54 Average Depth Fig 55 Displays the average depth of the current dive updated once per second When not diving shows the average depth of the last dive Average Depth in Atmospheres AvgATM Fig 56 The average depth of the current dive measured in absolute atmospheres i e a value of 1 0 at sea level When not diving shows the average depth of the last dive Circuit Mode Fig 57 59 The current breathing configuration One of OC Open circuit CC Closed circuit SC Semi closed circuit Current Gas O He Fig 60 The current gas shown as a percentage of Oxygen and He lium The remainder of the gas is assumed to be Nitrogen In closed circuit mode this gas is the diluent In open circuit mode this is the breathing gas Flashes Red when there
121. e ported and more checks are added with each software update Fig 237 Fig 238 Fig 239 Version 1 0 81 Prism 2 User Manual Battery Change The Secondary Display has a battery compartment in the side of the case Unscrew the battery cap counter clockwise with a large coin Fig 240 Bend a paperclip into a hook shape Fig 241 Hook the battery holder with the paperclip and pull it out Replace the battery with a SAFT LS14500 Push the wires into the battery compartment before inserting the battery holder Align the flat edge of the battery holder towards the button Gently press the battery holder into the battery compartment Fig 243 Tighten the battery cap clockwise with a large coin until it is flush with the case Fig 244 82 Version 1 0 Prism 2 User Manual Storage The Secondary Display should be stored dry and clean Do not allow salt deposits to build up on your Secondary Display Wash your Secondary with fresh water to remove salt and other contaminants Do not use detergents benzene or other cleaning chemicals Allow to dry natu rally before storing Do not wash under high pressure as it may cause damage to the depth sensor Also do not remove the strap bracket assembly as it acts as protection for the depth sensor After cleaning store the apparatus upright out of direct sunlight in a cool dry and dust free place Avoid exposure to direct ultra violet radiation and ra
122. e average of sensor 1 and 2 Sensor 3 will be flashing yellow Fig 154 Switching to Open Circuit mode Fig 155 The PPO used for calculation is now is the PPO of the selected gas at the current depth Fig 156 If we now unplug sensor 1 and sensor 3 the computer will use vot ing logic to pick the two readings that agree and will think the PPO is 0 Sensor 2 will be voted out and flashing yellow This is one of those times that the user will have to determine which sensors are correct Fig 157 Fig 151 Fig 153 Fig 154 Fig 155 Fig 156 Fig 157 Version 1 0 With sensors one and three unplugged we simulate the situation with fourth sensor monitoring If we calibrate in this situation the system will assume that this computer is only attached to one sen sor and will re configure for fourth sensor monitoring Fig 158 It will no longer average the sensors or vote on them Now the single sensor is the only one considered and the PPO used for calculations is the PPO of the single sensor Fig 159 Setpoint gt 19 Fig 160 It allows the solenoid to be turned off while on the surface when the loop is exposed to air This prevents the solenoid from firing continuously It is mainly used while uploading logs or other main tenance functions To switch back to normal low setpoint select the Switch Setpoint menu item The setpoint will also switch to normal low setpoint if a dive is s
123. e material next to the clamps for tears Fig 282 While continuing to stretch the hose look along the hose length at the rubber for signs of wear or age cracking If you see signs of abrasions or spider web cracking the hose must be replaced Never dive with breathing hoses that show signs of rubber ageing as immediate and catastrophic loop flooding will occur if a breathing hose fails during diving Version 1 0 103 Prism 2 User Manual b Oetiker clamps Check to make sure the clamps are securely locked down onto the hoses and then cover them with the silicone clamp covers so they do not snag fabrics such as wetsuit material while putting on and taking off the rebreather c o rings W There are two O rings on each breathing hose assembly You will find the first O ring under the counterlung elbow retaining nut of each hose assembly Pull the elbow retaining nut back with your thumb and forefinger and using an O ring pick gently remove the O ring from its groove Remove clean and prepare the O ring s O ring Grove and mating surface for use or replace if worn or damaged The O ring under the DSV BOV threaded nut counterweight is a bit trickier as you cannot fully retract the nut to expose the O ring However you can usually remove the O ring with a pick Pull the counterweight as far as back from the hose opening as possible You should be able to see the O ring Carefully extract the O ring from its groove making sure not t
124. e oxygen side of the system 28 Turn on Secondary Display Check cell mV readings in air replace if out of range 8 5mV to 14mV Record O2 Cell mV readings in air 1 2 3 Turn on the secondary display and switch to the Calibrate screen and record the mV outputs for each cell You will use these readings to check linearity once you have flushed the loop with pure O 29 Setpoint to 0 19 8X menu left button Make sure you have the active setpoint ay 0 19 so the computer is not automatically injecting O into the loop Depress the menu button 8 times until you see the Setpoint 19 menu item then press the select button once to select it 30 Oxygen system leak test 3 steps You will check to make sure there are no small leaks in the oxygen delivery system 1st stages hoses QD fittings valves a open oxygen valve pressurize hoses close valve Slowly open the oxygen cylinder valve Allow the hoses to fully pressurize Shut off the oxygen cylinder valve b watch oxygen pressure gauge for pressure drop Listen for leaks and check that the pressure on the gauge has not dropped after a minute or two open oxygen valve Open the oxygen valve 31 Negative Pressure test 4 steps hold for 1 minute minimum The negative pressure test will check for the types of leaks that may not show during a positive pressure test These types of leaks are fairly rare but are just as potentially dangerous so it is extremely importan
125. e steps here instead of making you go back to page 114 of the manual If you don t need to clean the O rings skip ahead to step 22 on page 125 The head to bucket sealing flange incorporates two bucket sealing O rings It is important that you clean and check both O rings and their seating surfaces whenever the bucket has been removed from the seating flange To begin the cleaning process using the supplied O ring removal tool which came with your Prism 2 remove the two O rings from their grooves starting with the O ring closest to the head 1 and lay it on a clean towel Next remove the O ring closest to the edge of the bucket flange 2 Never use any sharp or metal objects to remove the O rings as that would damage the O ring and or the seating surface Never over stretch the O rings while removing them Clean any debris usually small particles of soda lime and silicone on the O rings with a lint free towel Once clean run the O rings through your fingers feeling for any nicks or left over debris while visually inspecting them at the same time There must be no lint hair or particles of any kind on the cleaned O ring since debris on the O ring would cause a seal failure If you find any damage to the O ring it must be replaced with a new O ring from your spares kit Lay the 2 cleaned but not yet silicone treated O rings aside on a clean surface Clean the seating surface on the head flange making sure to remove any debris
126. e the seal to come loose during assembly Do not lubricate the red CO2 seal Clean the seal channel of any debris or lubricant b make sure the red CO seal is firmly seated in its groove triple check Check that the gasket is in place and securely seated in its channel in the exhaust plenum by pushing down on it all the way around the gasket Re check that the gasket is properly seated just before you install the scrubber basket and bucket assembly on the head 24 Check filled CO scrubber basket 2 steps Regardless of whether you packed your scrubber basket ten minutes ago or ten days ago you must re check the basket one final time before loading it into the rebreather This is especially true if the absorbent might have had an opportunity to settle during transportation or if the basket top came loose in handling Remember a properly packed absorbent basket is essential for a safe dive 124 Version 1 0 Prism 2 User Manual a basket top secure Make sure the basket top is tight and fully seated on the basket The bottom of the basket top should line up with the bottom of the threaded section ofthe basket cage Fig 332 b check for settling and firmness of absorbent bed Just as you do when packing the basket feel the absorbent from bottom to top It should feel evenly dense throughout Put slight pressure on the mesh by squeezing it should not displace grains of absorbent If the absorbent is not tight and even throughout you
127. e valve and seat in the exhalation side of the DSV Test the valve operation by attempting to gently inhale from the inhale side of the DSV with the mouthpiece closed You should see the mushroom valve firmly seat itself against the valve body but not be able to pull any air through If the valve does not seal the assembly must be replaced Exhalation Counterlung amp drain Tools needed Oeteker clamp pliers Large Bottle Brush Tribolube Steramine Clean dry cloth Remove the Manual O Addition Valve hardware from the counterlung by unscrewing it s threaded collar and set it aside Also make sure to remove the valve gasket and set it aside as well Remove the OPV by grasping its base and turning it counterclockwise You may choose to remove the breathing hose or you can clean it as a piece with the counterlung Fill the counterlung with Steramine and thoroughly clean the inside with the bottle brush being sure to scrub all sides bottom and top Loosen the Counterlung drain locking collar and allow some Steramine to run through the drain hole Pour the Steramine out of the counterlung and re drain the counterlung drain If you removed the breathing hose for cleaning reattach the hose with the Oeteker clamps and hang the counterlung to dry It is always recommended that if you hang the counterlungs to dry in an area where bugs can enter you stuff all the holes in the counterlungs using paper towels This will allow the interior of the lu
128. eath Fig 342 128 Version 1 0 Prism 2 User Manual Field Notes What s a few minutes At any time but especially for extended range diving it is advisable to allow the loop to sit for at least 5 minutes before checking to see if vacuum or pressure Is being lost Small leaks may not allow enough pressure or vacuum to escape in the first minute or two of the tests to be noticeable by palpation of the counterlungs but may allow enough water into the loop during diving to become problematic Small leaks will also usually show up in the preliminary bubble check step 41 but it is usually less time consuming to identify and correct leaks at this stage of set up 29 Positive pressure test 4 steps hold for 1 minute minimum The positive pressure test will identify most leaks in the breathing loop a close OPV Make sure the DSV BOV is still closed and turn the OPV over pressure valve fully counter clockwise to restrict its flow Fig 336 b fill loop fully with oxygen using manual oxygen addition valve Fig 336 until OPV engages Depress the manual oxygen addition valve on the exhalation counterlung Continue adding oxygen into the loop until the over pressure valve on the front of the exhalation counterlung right begins to release pressure The counterlungs should feel firm to the touch and remain that way If the counterlungs lose pressure you must track down and fix the leak or leaks prior to diving If the leak is
129. ecial the first row showing the bottom time and the second showing the ascent to the first stop When diving these two rows are not displayed Fig 140 Fig 141 Example Results Table for Closed Circuit and Bailout If more than 5 stops are needed the results will be split onto on several screens Use the right button to step through the screens For OC or BO profiles a total gas consumption report is given Fig 142 Gas Usage Report 58 Version 1 0 Prism 2 User Manual The final result screen shows the total dive time the time spent on deco and final CNS Results Summary Screen Fig 143 lf no decompression is required no table will be shown Instead the total No Decompression Limit NDL time in minutes at the given bottom depth will be reported Also the gas quantity required to surface bailout in CC will be reported No Decompression Results Screen Fig 144 Version 1 0 59 Prism 2 User Manual 60 NDL Display Fig 145 The NDL Display option allows you to display four different values during the dive The display can be changed during the dive to provide different information Pushing SELECT will make the NDL display editable The first choice available will be NDL If you select NDL the NDL will always be displayed during the dive whether or not you have a decompres sion ceiling Fig 146 The next selection is CEIL With this setting as long as the NDL time is 0 you have a decompression
130. ect to video a sunken vessel in the Baltic Sea with Rob Palmer utilizing Pete s Marine Engineer qualifications Video evidence indicated deliberate scuttling But engineers are a resourceful group and they like nothing better than to design a better mousetrap or in this case redesign a rebreather Working with Stuart throughout the early to mid 1990 s refining and redesigning they did everything they could to bring rebreathers to the sport market or as Michael Menduno put it the second coming because CCRs had made brief foray into the professional diver market in the late 1960 s early 19705 These were heady start up days when people started to come out of hiding and confess to their accomplishments mixed gas technical diving computer generated decompression software and AquaCorps Tek Shows Much hard work done then by those pioneers did not always result in the rewards that they may have been due but their efforts grew the market and we have all profited from the fruits of their labours Pete and Dr Brad Carte in Drager SMS2000 Dec 1992 Jan 1993 Discovery Bay Marine Lab Jamaica during testing SmithKline Beecham contracted PRISM to dive the Twilight Zone in remote locations looking for organisms which could help in cancer cures etc XIV Version 1 0 Prism 2 User Manual Peter has continued to work and develop his design taking it from a variable mass flow controlled SCR to simple analogue electronic
131. eful not to jostle the counterlungs as any added pressure could cause the OPV to allow the excess pressure to escape You can also palpate feel the counterlungs after filling them and after a few minutes see if they feel the same as they did when you first filled the loop This is the preferred method if you are on a moving boat where the counterlungs will most certainly experience some jostling d open DSV BOV evacuate loop contents Fully open the DSV BOV in CC mode and push on the counterlungs to remove as much gas as possible from the loop 30 Flush loop with O 3 steps Since the DSV BOV is open at this stage pull another negative a close DSV BOV Once you have pulled the negative close the DSV BOV b fill loop with oxygen until OPV engages Do this step twice Press the Manual Oxygen Addition valve as before and fill the loop until the OPV engages c open DSV BOV to equalize pressure to ambient pressure Close DSV BOV Crack open the DSV BOV momentarily to let any positive pressure escape from the loop 31 Calibrate Secondary Display Electronics 3 steps This step will calibrate the Secondary Display a menu to calibrate 2X menu left button Depress the menu button left twice to get to the calibrate screen if the screen has timed out during the loop flush or you were not on the calibrate screen during the previous step If you are already on the calibrate screen continue on to the next step below b press selec
132. empt to bend the roll bar back in place while on the rebreather as you could shear off parts of the unit causing significant damage Instead remove the part and using a bench vice and a rubber mallet slowly re bend the part checking fit every so often or simply return the part to your Hollis Prism 2 dealer for repair Electronics Stack The electronics stack sits on an O ring sealed housing directly under the battery compartment Inside the compartment are the O Sensor Routing Board and Primary Display Logic board The bulkhead connectors for the batteries and electronics wiring also terminate in the Electronics Stack There are no user serviceable parts inside this compartment Your Prism 2 comes from the factory with this compartment having undergone clean room assembly and rigorous pressure testing Please do not break this seal Breaking the clean room seal on the compartment unnecessarily makes it far more likely that flooding will occur in the compartment Your local Hollis Dealer will gladly take you on a full tour of the guts of the Prism 2 should you wish to see what the interior of this compartment looks like Solenoid Chamber Underneath the Electronics Stack sits the O ring sealed Solenoid Chamber Inside the chamber is the Solenoid and the bulkhead electronics connector going out to the controller There is also an Over Pressure Relief Valve built into the chamber wall that is designed to vent gas to the outside of the rebreat
133. en DEPTH TIME SIOP TIME 1 25 1 24 1 25 1 23 1 25 Fig 221 Fig 222 Figures 221 222 Cyan and Gray Title Colors green and blue also available OC Show PPO When in OC Only mode sets whether the GasPO2 value is displayed on the main screen Default is On Note This setting has no effect on Closed Circuit enabled models unless the Only setting is turned on End Dive Delay and End Dive menu option oets the time in seconds to wait before ending the current dive This value can be set from 20 seconds to 600 seconds 10 minutes Default is 60s Since the Predator can stay in dive mode for a longer time a new End Dive menu option has been added This is the first menu option when the Predator is still in dive mode AND is at the surface Advanced Configuration Page 2 Advanced Config Page 2 allows changing of PPO limits Warning Do not change these values unless you understand the effect See descriptions below Version 1 0 Tf Prism 2 User Manual All values are in absolute atmospheres ATM of pressure 1 ATM 1 013 Bar Adv Config 2 Min PPO2 0 1 OC Max PPO2 eco PPO2 in PPO x PPO2 I n i Fig 223 OC Min PPO PPO displays in flashing red when less than this value Default 0 19 OC Max PPO PPO displays in flashing red when greater than this value Default 1 65 OC Deco PPO The decompression predictions TTS and NDL will assume that the gas in use at a
134. en air is passed under pressure through an adsorbent bed of microporous aluminosilicate minerals called zeolites that attract Nitrogen N but pass through O the N will remain be adsorbed into the zeolite bed and the gas coming out of the adsorption chamber will be enriched in oxygen When the zeolite becomes super saturated with N and can adsorb no more reducing the pressure releases the adsorbed N regenerating the zeolite The adsorption chamber is then ready for another cycle of producing oxygen enriched air Theissue with using PSAderived oxygen in hyperbaric applications especially rebreathers is that the absorbents used to capture and then release N gas during the pressure swing cycles has an inconvenient aversion to another inert but highly narcotic gas at elevated partial pressures found in air Argon Ar Therefore argon is passed through along with the oxygen This is not an issue for the intended medical or industrial purposes so the presence of increased percentages of argon is usually not addressed The first problem that we closed circuit divers encounter when mixing any inert gas with our O delivery is that every time you need to inject O to maintain setpoint you are also adding an inert gas that over a short time will build up in the loop thereby adding unwanted volume With a gas like N at recreational depths this is more of a buoyancy challenge than anything else However because of Argon s heightened narcotic
135. end no faster than 10m 30fpm watching your PO on your secondary display Add oxygen to maintain your setpoint but remember that you should not add oxygen while your OPV is venting gas as the added oxygen will vent with the expanded gas One trick is to exhale some of the expanded loop volume from your nose while adding oxygen to offset the added pressure of that added oxygen without actuating the OPV Field Notes Buoyancy Warning During your ascent from depth the Prism 2 will be automatically adding O to maintain loop PO that can have a significant effect on the buoyancy of the diver You will need to dump gas from your buoyancy device dry suit and counterlungs to avoid an uncontrolled ascent It is very important that you ascend no faster than 10m 30fpm per minute to avoid a runaway ascent on your CCR Until you have sufficient experience with your Prism 2 you should use an up line during ascent You will want to be continually dumping air from your buoyancy device dry suit and counterlungs exhale through your nose to maintain minimum loop volume Version 1 0 157 Prism 2 User Manual Field Notes PO Warning Never allow the PO in your loop to go above 1 4ata oxygen If you do accidentally spike your PO exhale through your nose and inject diluent then breathe normally and monitor the drop in your PO Repeat if necessary to bring your PO back to your target Continue to monitor your PO on your primary and secondary
136. ened risk of spontaneous combustion when LION batteries come into contact with water so do not put the rebreather in an enclosed environment if you suspect a battery compartment flood Warning Recovering from a Battery Compartment Flood Replacing the Battery Cap Pressure Relief Valve AWAITING DIRECTIONS FROM FACTORY Battery Cap Locking Latches Tools needed 1 16 Allen head wrench The two Nielson Sessions locking latches that secure the battery cap are held in place by two 4 40 button head hex screws at the base of the latches To replace a broken latch remove the two hex screws replace the latch and replace the two Hex screws Be sure not to strip the screw holes by over tightening the screws Stainless Steel roll bar cover holder Tools needed Medium bit Phillips head screwdriver 6 small adjustable wrench 7132 hex wrench Should you ever need to take the roll bar off the head mounting hardware which it is screwed into remove the Phillips head screw and locking nut from both sides of the bar and pull up Note that the stainless steel head mount hardware will fall off the head when you remove the roll bar if you have not secured them in place Version 1 0 171 Prism 2 User Manual If the roll bar has sustained an impact sufficient to cause it to bend it may need to be replaced since it acts as the top connecting point for the head protection cover and has to line up just right to fit the cover in place DO NOT att
137. er material prior to installing it in the rebreather Cleaning Your Empty Scrubber After use it is always a good idea to wash and dry the scrubber basket basket pads and bucket to remove residual dust and used absorbent Use fresh water and make sure to wash out any loose granules If you notice that the threads of the basket or top are becoming clogged by crushed caked absorbent dust or the absorbent is beginning to cake up Fig 257 you will need to soak the top and basket threads in 50 to 100 white vinegar for 15 to 30 minutes which will dissolve the caked on absorbent and return the basket to like new condition Heating the vinegar BEES aos to 120 F 49 C will make it work faster but will make you unpopular with E anyone close by Wash the cleaned parts thoroughly with fresh water until the smell of vinegar is completely gone Disposing of used CO absorbent You have probably heard that used absorbent is simple calcium carbonate the same stuff seashells and reefs are made from Eventually that will be true but even spent absorbent is still highly caustic and will be for some time Never dump freshly spent absorbent in the ocean It is best to find a covered pail or a garbage bag in which to store the spent material and mark the container as containing a caustic substance N WARNING If you do need to store the scrubber or transport it to your dive site YOU MUST check the scrubber basket for absorbent material s
138. ery during this time Clearing the log will not clear the dive number Note The Secondary Display has a 20 hour dive log memory If this limit is exceeded the oldest dive logs will be overwritten by the newer dives Fig 162 Fig 163 Fig 164 Fig 165 Fig 166 Fig 167 Fig 168 Version 1 0 Prism 2 User Manual Firmware Upload and Dive Log Download lIn structions Plug the Bluetooth dongle into your PC if bluetooth support is not built in Place the Secondary within 6 inches of the Bluetooth dongle Go to http Awww hollisgear com Prism2 library and download the most recent version of Prism 2 Desktop with Air and the latest firmware update Uninstall any old versions and install the new Desktop Fig 169 If Dive Computer menu item is greyed out the PC cannot find a Bluetooth device plugged into it Fig 170 Update Cor Dive Ley If you cannot connect to either update firmware or Datei Timo download dive log then you need to ensure that Bluetooth is working on your PC or laptop Fig 172 61400 0 11 11 16 2008 11 Once you can access dive computer run the program and Fig 169 select Update Firmware from the Dive Computer Menu Fig 171 Select the Prism2 AES file that is with the document Lind erc Ee Br Fig170 Fig 172 Now
139. ether underwater or on the surface is an integral step in all emergency bailout drills so it MUST come as second nature muscle memory Field Notes Open Up Shut Down When Operating the DSV BOV lever try to remember open up to open the loop and shut down to close the loop Field Notes The Hollis 3 position BOV On the surface with the BOV you will want to pull the lever up past the closed circuit mode stop and into the sealed mode so the BOV second stage does not free flow when you let the BOV second stage drop into the water 150 Version 1 0 Prism 2 User Manual Skill 4 Mask Clearing Unlike Open Circuit mask clearing where you might exhale fully to clear a mask in rebreather diving your objective is to clear the mask of water but not exhale more gas that is absolutely necessary Therefore when you clear your mask try to do so without a great stream of bubbles coming out of the mask after you have displaced the water by exhaling through your nose You will find that a bit of patience and more attention to the skill will help you accomplish this easily and minimum gas mask clearing will become second nature quickly Skill 5 Remove clear and replace DSV BOV In skill 3 you practiced shutting down your DSV BOV while it remained in your mouth In the DSV BOV removal drill you will shut down the DSV BOV as before then remove it from your mouth In so doing the mouthpiece portion will fill with a small amou
140. ettling prior to inserting it in the rebreather If the absorbent seems loose at all top off the basket with additional absorbent prior to use Failure to insure a properly packed scrubber may lead to injury or death Caution To avoid damage use only factory tested cleaning solutions See the list of approved cleaning solutions in the Addendum for further information Version 1 0 89 Prism 2 User Manual Setting up your PRISM 2 using the checklists The importance of using your Prism 2 checklists Imagine you are sitting on a commercial airliner watching the pilot ready the plane for takeoff The copilot turns to the captain and asks if he is ready to go through the pre flight checklists The pilot does a cursory scan of the cockpit turns to the copilot and says Everything looks good to me we can skip them How comfortable would you feel flying at 32 000 feet with that captain at the controls Case study of a close call A rebreather diver self described as being very experienced with his rebreather has completed two 172 hour dives He changes out the scrubber with fresh absorbent to complete a third 2 hour dive later in the day He reports that he was feeling rushed because he was delaying his buddies from lunch After quickly re packing the scrubber relying on memory instead of his checklist he reassembles the rebreather and then joins his buddies The importance of working with checklists when setting up y
141. etween Semi Closed circuit and Closed circuit operation It allows the computer to make accurate projections based on the way the PPO changes during ascents It allows much more accurate predictions for Time To Surface TTS if the Prism 2 is dived in Semi Closed mode Auto SP Switch Auto Setpoint Switch configuration sets up the setpoint switching It can be set up to switch up only down only both or neither Fig 200 The first option is the switch up function This configures the switch up from the low set point to the high setpoint Pushing MENU switches it back and forth between Auto and Manual Fig 201 Note The Up Auto SP switch occurs during the descent Fig 195 Fig 196 Fig 197 Fig 198 Fig 199 Fig 200 Fig 201 Version 1 0 The next option is still a part of the switch up function and enables the editing of the switch depth Fig 202 Next is the switch down function This configures the switch up from the high set point to the low setpoint Pushing MENU switches it back and forth between Auto and Manual Fig 203 The final option is still a part of the switch down function and en ables the editing of the switch depth Fig 204 Either switch can be turned on or off independent of the other switch The system limits the allowable setpoint settings Switching up is allowed from 20 999 feet and from 6 999 meters Switching down is allowed from 9 999 feet and
142. eve Add a little extra Tribolube in the groove around each O ring as this will help keep them lubricated better and for a longer period between cleanings Reinsert the barrel into the inhale side of the DSV body making sure the O rings are not rolling out of their channels and getting pinched between the barrel and DSV body Once the barrel is in the center 176 Version 1 0 Prism 2 User Manual of the body and properly aligned clean and lube the knob O ring and place it and the knob in its hole in the barrel and screw it in place using the hex screw Rotate the barrel to make sure it turns easily then close it and blow through the purge If the barrel does not rotate easily you have probably pinched an O ring while re installing the barrel Any O ring that gets pinched will need to be replaced with a new one Replace the mouthpiece and mouthpiece retaining strap Last but most important is the exhalation mushroom valve The mushroom valve and valve seat are delicate parts and should be cleaned with care Remove the O ring on the outside edge of the valve body and set it aside Using a soft sponge soaked with Steramine gently wipe down the topside of the mushroom valve and then gently lift the valve off the valve seat and wipe down the underside of the valve as well as the valve seat Clean the O ring groove and set aside the valve body to dry Clean the O ring you had set aside treat it with Tribolube and reinstall it in its grove Replace th
143. g pressure you can use a spray bottle filled with soapy water to track down the leak Fig 338 Never dive the Prism 2 with leaks in the diluent system as catastrophic loss of pressure could occur during a dive Turn the diluent tank back on Fig 338 40 Confirm alternate air source operation If your Prism 2 is equipped with a BOV switch to open circuit mode and breathe from it to verify that it is operational If your Prism 2 is equipped with a Hollis 410 or other alternate air source breathe from it If your diluent system has multiple alternate air sources attached switch from one to the other 41 Check buoyancy compensator inflation air holding and deflation mechanisms Auto inflate the buoyancy compensator partially and verify that it is holding pressure Deflate the buoyancy compensator by letting a little air out of each deflation mechanism 42 Record diluent pressure How much diluent did you use during set up and how much diluent do you have left Is it enough Recording the post setup diluent pressure will insure that you are aware of how much gas you have prior to commencing dive operations If diving immediately continue with immediate pre dive checks now Skip to step 43 If NOT diving immediately Close O and diluent cylinder valves amp drain lines turn off electronics and secure unit 134 Version 1 0 Prism 2 User Manual Immediate pre dive checks amp system settings 43 Verify dive plan with budd
144. gest CO absorbent due to a loop flood known as a Caustic Cocktail immediately seek emergency medical treatment and drink copious amounts of water DO NOT INDUCE VOMITING unless instructed to do so by medical professionals For more information see the Material Safety Data Sheet in the Apendix and contact your local Poision Control Center The Prism 2 scrubber is easy to pack and with experience should only take 5 to 10 minutes from set up to clean up Find a dry area away from and downwind of other people If necessary take a moment to let people around you know that you will be working with caustic materials and request they stay upwind from where you will be working Before handling the caustic CO absorbent put on your personal protective gear including gloves breathing mask and eye protection Fig 246 A dive mask may look silly but works quite well as eye protection A Fig 246 Version 1 0 85 Prism 2 User Manual Spread out a towel or other soft covering on the ground in a flat area and lay a few sheets of paper towel or newspaper on top of that Place the bottom foam pad larger center hole in the basket making sure it lays flat against the bottom and sides of the basket Fig 247 Take a piece of paper golf ball or absorbent container cap and cover the top of the center tube This will keep absorbent from going down the center tube as you pour it into the scrubber basket Fig 248 Fig 247
145. gradient factor decompression algorithm revolves around Dr Albert A B hlmann s tissue model Currently this means 16 hypothetical tissue compartments that are constantly tracked during a dive in order to determine each tissue compartment s inert gas pressure As you ascend all those tissue compartments start to release pressure off gas The question is How fast can you let those tissue compartments off gas B hlmann answered that question by coming up with an M value Basically an M value is a maximum pressure value different for each depth and tissue compartment that tells you if you exceed that value your chances of getting decompression sickness are greatly increased A natural ascent strategy then would be to move up the water column until the pressure in your tissue compartments just reaches B hlmann s M value and then let your tissue compartments off gas a bit rise to the next level etc In this strategy you would keep going up in such a way that you never let your tissue compartments exceed B hlmann s M value Unfortunately decompression illness does not exactly track B hlmann s M values A greater potential for decompression illness occurs at and above the pressures represented by M values and the potential lessens when divers never reach B hlmann s M values Enter Gradient Factors Gradient factors GFs were invented to let the diver choose how fast and how close their tissue compartments get to B hlman
146. h most things governmental is of course yes and no USP Grades and their contents in ppm Content A B C D E F G Oxygen Min mole _ 990 99 51 995 995 995 1 99 995 99 5 _ Water v v p 66 8 10 2 Dew Point F leas 82 50 105 or Methane 115 Nitrogen J Carbon Dioxide BB BE EN I EB Carbon Monoxide Total Hydrocarbons as ne methane Soe bons A Nitrous Oxide 0 0 Malosarbons Solvents The Designator USP that you often see associated with breathing gasses in the U S stands for United States Pharmacopoeia which is a standards group that has set forth minimum standards which must be met to wear the USP stamp USP oxygen is divided into 7 grades designated simply as A B C D E Fand Grade A is the minimum requirement for USP oxygen Grade E is commonly called aviator s grade 166 Version 1 0 Prism 2 User Manual What divers can get without a prescription is the E or Aviator s Grade oxygen that while certified USP does not require a prescription Recently dive shops have been carrying oxygen with the designator GMP which stands for Good Manufacturing Practice and is equivalent to USP O but is not classified as a controlled substance similar to USP grade E but is usually less expensive than USP oxygen What you do notice about all these grades of USP oxygen and GMP is that they are al
147. he main screen depress the select right button six times until the EXT V external solenoid voltage and INT V internal secondary voltage readings are display on the bottom of the screen Fig 349 Record the EXT V in the space provided A voltage greater than 7V is considered Ok and below 7V indicates the alkaline batteries must be replaced before diving Do not use a voltage meter to check battery state as most meters do not put a load on the battery and will give artificially high readings as a result 132 Version 1 0 Prism 2 User Manual Warning Always replace both alkaline batteries at the same time Using one fresh and one used battery may give false voltage readings to the computer and may cause the solenoid to stop working possibly mid dive Both Solenoid 9V Alkaline X 2 batteries MUST be replaced at the same time Failure to do so could lead to injury or death 37 Secondary display Battery check Kreplaced amp OK On the same display screen as the solenoid battery EXT V is the battery voltage for the Secondary Display battery shown under INT V Fig 350 Check and record the INT V value in the space provided If the voltage value is flashing yellow or red you must replace the battery before diving Field Notes Time out The voltages screen is timed and will automatically go back to the main screen after 20 seconds To make your life easier it would be a good idea to record both
148. he oxygen sensors when stored should be kept in a cool ambient unsealed environment to insure they are immediately operational If you will be storing the sensors for a month or more you can place them in an airtight container in a refrigerated environment that is kept above 34 F 0 1C to insure that the electrolyte does not freeze see Environmental Conditions above While this will not extend the operational life of the sensor it may reduce response time degradation during the latter part of its 16 month service life After storage you will need to acclimate the sensors by placing them in air at room temperature for 24 hours prior to putting the sensors back in service Failure to acclimate the sensors after storage can cause the sensors to read incorrectly and possibly lead to injury or death Are the O sensors date coded Oxygen sensors have a finite life Understanding the date code is vital to getting the benefit of the warranty period As an example the serial number 10734789 breaks down as follow Digit 1 a 1 denotes the year of manufacture as 2011 digits 2 3 07 indicate July as the month of manufacture the remaining digits are sequential for uniqueness As the result of a number of issues related to the use of aged sensors Analyitical Industries has added a DO NOT SELL AFTER date to the sensor s labeling which is 4 months from the date of manufacture along with a requirement that the cells service life must not
149. he plunger and clean both pieces with Steramine and a toothbrush Looking down into the core of the valve look at the Stainless Steel Schrader valve It should appear shiny without any rouging light rust It is not necessary to remove the valve unless it looks worn or is leaking If either condition exists remove the valve and the quick disconnect fitting on the outside of the valve and run a stream of fresh water through the hole Clean the O ring on the quick disconnect fitting threat with Tribolube and replace the fitting being careful not to over tighten it Thread in a new stainless steel Schrader valve using the Schrader valve tool being careful not to over tighten it 174 Version 1 0 Prism 2 User Manual DSV BOV Inhalation hose amp fittings Tools needed Oeteker clamp pliers Large Bottle brush toothbrush sponge Tribolube Steramine The inhalation side of the DSV BOV hose assembly contains the inhalation side mushroom valve and valve seat Before cleaning the hose it is important to remove the mushroom valve and seat Removing the part will allow you to run a bottle brush through the hose but the valve and valve seat require special separate treatment as described in the next section To remove the valve seat remove the 2 Oeteker clamps holding the valve seat and DSV BOV counterweight pull the part from the hose and set it and the counterweight aside Also remove the 2 Oeteker clamps holding the elbow and remove the elbow f
150. he scrubber basket in accordance with the directions on pages 85 87 Record the date you packed the scrubber the grade used 6 12 or 8 12 any usage time you have put on the scrubber since it was packed and the time left before the CO absorbent must be disposed It is important to remember that using the scrubber beyond the factory tested maximum allowable time of 260 minutes per fill with 6 12 or 8 12 diving grade CO absorbent is extremely dangerous and can lead to injury or death 14 Fill O amp diluent cylinders analyze contents label cylinders with name date and contents Have the Oxygen cylinder filled with pure E grade usp or higher O See Article Speaking the language Oxygen on page 168 Fill the diluent cylinder with an appropriate diluting gas for the planned dive s Never use a hypoxic mix of diluent with a BOV or alternate air source plumbed in Crack the diluent cylinder and sniff the gas It should have no odor If it does suspect contaminants in the fill have the cylinder inspected by a qualified inspector then have it re filled from a new source Verify the oxygen content of BOTH bottles using a calibrated oxygen analyzer Fig 262 The oxygen should read 100 and the diluent if air 20 9 see your oxygen analyzers directions for calibration and environmental variance information You can dive the Prism 2 using oxygen of less than 100 purity See the instructions on page 67 for details O
151. he supplied O ring removal tool which came with your Prism 2 remove the two O rings from their grooves starting with the O ring closest to the head 1 Fig 303 and lay it on a clean towel Next remove the O ring closest to the edge of the bucket flange 2 Fig 304 m Fig 303 304 Never use any sharp or metal objects to remove the O rings as that would damage the O ring and or the seating surface Never over stretch the O rings while removing them Field Notes Order out of chaos Removing the O rings in the order stated above keeps you from having to drag an O ring across an empty O ring groove which can result in nicked stretched or broken O rings Clean any debris usually small particles of soda lime and silicone on the O rings with a lint free towel Once clean run the O rings through your fingers feeling for any nicks or left over debris while visually inspecting them at the same time There must be no lint hair or particles of any kind on the cleaned O ring since debris on the O ring would cause a seal failure If you find any damage to the O ring it must be replaced with a new O ring from your spares kit Lay the 2 cleaned but not yet lubricated O rings aside on a clean surface Clean the seating surface on the head flange making sure to remove any debris that may have collected in the O ring grooves Field Notes Lubricants The amazing dirt magnets Never lay a Tribolube treated O ring down
152. her if the solenoid were to ever lose gas containment Like the Electronics Stack your Prism 2 comes from the factory with this compartment having undergone clean room assembly and rigorous pressure testing Please do not break this seal as doing so makes it far more likely that an accidental flood will occur Exhaust Plenum Tools Needed 1 16 inch Allen Head Wrench The exhaust plenum cover is held in place by four 4 40 SS button head screws and washers and sealed with an O ring Under normal circumstances there is no need to open the plenum cover If however you have fully flooded the rebreather you may want to open the chamber and using a clean damp cloth wipe and caustic materials off the surfaces DO NOT pour water into the Exhaust Plenum when cleaning it as the compartment contains the oxygen inlet from the solenoid and doing so may accidentally introduce water into the solenoid Clean the O ring prior to re installing the cover There are no mechanical parts inside the Exhaust Plenum 172 Version 1 0 Prism 2 User Manual Red CO Seal Tools Needed None If the gasket gets dirt or absorbent dust on it remove the gasket from its grove and clean the surface of the gasket with warm soapy water rinse and allow to air dry The gasket should feel gummy but not sticky to the touch If the gasket has hardened or has cuts or abrasions on its surfaces it needs to be replaced DO NOT use lubricant of any kind on the Red CO Seal
153. hermally protect the scrubber material by creating an insulating gas space around the scrubber Because high pressure Urethane is a very poor thermal conductor compared to other commonly used materials such as aluminum or stainless steel it also acts to preserve the heat needed for efficient CO sequestration a basket compression spring and 1 The scrubber basket compression spring Fig 310 sits on a retaining pin that is molded into the bottom of the scrubber bucket The spring is designed to keep the inhalation tube area of the scrubber basket firmly sealed on the red Red CO Seal mounted on the exhaust plenum in the head Confirm that the spring seat and locking nut are in place and that the spring compresses by pushing down on it Fig 310 114 Version 1 0 Prism 2 User Manual b latches W There are four Nielson Sessions stainless steel hinged latches Fig 311 mounted on the stainless steel band toward the top of the bucket Operate the latches and check that they are free of debris or rust or excessive wear Verify that the locking mechanism lock firmly into place Warning Damaged or worn latches must be replaced before immersing the Prism 2 in water or commencing diving operations Failure to verify that the scrubber bucket latches are in good working order or diving with broken or worn latches can result in a catastrophic flooding of the loop possibly leading to serious injury or death 1 moi
154. hind pieces of dive gear Do you know where your weight pockets are g fastening clips W Check for broken or cracked parts in the following areas a waist strap Buckle Fig 269 b large counterlung retainer clips attached to waistband male Fastex Fig 270 small lateral counterlung adjusting straps male Fastex Fig 271 Fig 269 Fig 271 100 Version 1 0 Prism 2 User Manual 2 Inspect counterlungs 7 steps a fabric W Lay the counterlungs out and inspect the fabric for tears or obvious signs of abnormal wear While the counterlungs are quite robust you must never dive with counterlungs that show signs of excessive wear or damage as counterlung integrity failure during a dive would cause immediate and catastrophic flooding of the breathing loop Shake the counterlungs to make sure no foreign objects have entered the counterlung during storage or transportation Smell the inside of each counterlung They should not have any distinct odor b drains Unscrew the locking collar and actuate the valve by depressing the nipple inward toward the body of the valve Fig 272 Blow into the valve to make sure it is not clogged or broken The valve should pop back out when you let go of the valve If it does not it must be serviced Re tighten the locking collar Fig 272 c threaded DSV BOV hose assembly rings W Check for cracks and thread stripping The hose mount rings Fig 273 are welded to the counter
155. hy Manual Control or Computer Control Getting to know your Prism 2 Schematics amp Design The Gas Path Oxygen and the exhalation side of the loop The OPV Over Pressure Valve Exhaust Plenum The Scrubber The Inhalation Counterlung The DSV Diver Shut Down Valve The BOV Bail Out Valve Battery Compartment Cover Battery Compartment O Sensors Sensor Holder Connector amp Pins Solenoid Solenoid Electrical Connections Solenoid O Rings Bucket Sealing O Rings Article The Solenoid and the PID Controller Bucket Latches Basket Spring on Bucket Absorbent Basket Assembly Backplate O and Diluent First Stages Fitting your Prism 2 Article Stability by Gerard Newman Article Taking care of your Oxygen Sensors Part 2 Displays and Electronics Operation Displays and Controllers LED Primary Display Light State Table Low Battery Warning Secondary Display Buttons Menu Menu Structure xiii xiv 0005 27 27 28 28 29 31 32 33 Version 1 0 Prism 2 User Manual Basic Setup 34 Display Elements Descriptions 35 Fraction Inspired 36 Ascent Bar Graph 36 Battery Symbol 36 Depth 36 Dive Time 36 Stop Depth and Time 36 Average Depth 37 Average Depth in Atmospheres 37 Circuit Mode 37 Current Gas 37 No Decompression Limits 37 Ceil 37 GF99 37 5 37 Time to Surface 38 Maximum Depth 38 CNS Toxicity Percentage 38 Setpoint 38 Average PPO 38
156. id batteries 1 LED primary display battery 1 o o rings 2 W 1 cover cover latches amp keepers W E spp Solenoid operation O if proceeding immediately to assembly and operational checks you can skip this step Inspect head assembly 5 steps red CO seal W head to bucket o rings 2 W 1 latch keeper W O o ring seats W 1 nut bars head bolts head cover bar and head cover W Oxygen sensors 3 steps 1 oxygen sensors and sensor holders installed 1 1 oxygen sensor wiring harness 1 O readings within 8 5mV to 14 mV in air Bucket assembly 3 steps 1 basket compression spring and Version 1 0 L H latches 3 W O 1 moisture pad 1 Basket assembly 4 steps Bi E 1 L check mesh W center tube o ring 1 top and basket threads clean O top and bottom foam pads 1 Field Notes Prism 2 User Manual It is always recommended that you do a full set up and pre dive check before any trip as that is the only sure way to verify all systems are fully functional Version 1 0 93 Prism 2 User Manual Prism 2 Assembly Order Step by step descriptions are located in the user manual Oo Fill scrubber basket with CO absorbent amp store in airtight container Label container grade date filled user time used Date Packed Grade Time Used Time left Maximum Scrubber Duration 260min 0 5 SEV
157. ig 23 10 Version 1 0 Prism 2 User Manual All electrical components of the solenoid are external to and isolated from the breathing loop The solenoid chamber has an overpressure valve that should the solenoid ever loose gas containment vents to the outside environment Fig 24 There are no user serviceable parts in the solenoid compartment and only factory authorized repair technicians should replace the solenoid Field Notes Because the oxygen solenoid is a safety critical part should it malfunction it must be replaced by a factory au thorized service center never repaired Solenoid Electrical connections The Molex electrical connector for the solenoid is found in the electronics module and connects through a bulkhead into the sealed solenoid compartment Fig 25 There are no user serviceable parts inside either compartment and these compartments should only be opened by an authorized service center Fig 25 Solenoid O rings The solenoid is sealed by two O rings Fig 26 The outer O ring seals out water and the inner O ring keeps the oxygen contained within the solenoid The O rings are replaced during routine annual service by an authorized Prism 2 service center and are therefore not considered user serviceable parts Fig 26 Bucket sealing O rings There are two bucket sealing O rings Fig 27 for redundant sealing of the breathing loop Standard user maintenance during system set up and
158. ig 96 The NDL is 8 minutes and the TTS is 4 minutes The TTS just reflects the ascent time at 30 fpm The computer has automatically switched to the high setpoint This can be disabled if automatic setpoint switching isn t required We are now at our maximum depth Our first stop is at 90 feet Fig 97 The diver is ascending to the 90 foot stop Note the ascent rate indicator showing a 30 fpm 10 mpm ascent rate Although the ascent rate is 30 fpm now during the 7 minute ascent the diver ascended slower than was predicted and now there is a 100 foot stop Fig 98 Version 1 0 But the diver missed the stop and has ascended to 95 feet At this point the stop depth and time is flashing red to show that the depth is above the recommended stop Fig 99 The diver switches to the other programmed CC gas air Note that if you change the diluent on the computer you must flush the loop to change the diluent in the loop At the same time the 100 foot stop clears It is common for the first stops to clear in less than a minute They mainly just slow down the ascent Fig 100 At 60 feet a problem develops that causes the diver to bail out to open circuit The first push 1 on MENU brings up Select Gas Fig 101 The second push 2 brings up Switch CC gt OC Fig 102 A push on SELECT does the switch 3 The system has switched the gas set from the closed circuit gas set to the open circuit gas set picked the g
159. ighter so you can ascend and exhaling will decrease your displacement of water making you heavier so you can descend In closed circuit diving none of this applies Remember you are simply moving your breathing gas from one flexible membrane your lungs to another flexible membrane your counter lungs Therefore we must rely on our buoyancy device to maintain neutral buoyancy Every open circuit trained diver who takes a rebreather class always comments in frustration that they have to re learn their buoyancy skills This is normal and you will quickly learn to adjust This means the fin pivot as a way of attaining neutral buoyancy is out It won t matter how much you breathe in or out Your buoyancy won t change To maintain depth with a rebreather you will add just enough air to your buoyancy device to get you neutrally buoyant and when swimming use your body as a rudder and your fins as propeller If you want to go up slightly bend your body so your head and chest are higher than your lower body and kick with your fins If you want to descend slightly put your head and shoulders down while kicking As you change depths inflate or deflate your buoyancy device as needed but never use your buoyancy device as an elevator button allowing the equipment to control your ascent or descent Remember ascents and descents on a rebreather must be slow and deliberate to control and maintain your PO Skill 13 Manually maintain setpoint swimm
160. in chemical components which may be harmful to components within the rebreather CAUTION Never Use the following products or families of products on ANY part or surface of the Prism 2 rebreather Products which contain alcohol high concentrations of chlorine ammonia gasoline Benzene or any petrochemical based solvent Basically any product with the suffix ene in it Polishes wax automotive cleaning products Glues binding agents plastic fillers other than those specifically listed in the maintenance and troubleshooting or approved products sections of the manual CAUTION Never attempt to clean your rebreather or any part of your rebreather in a dishwasher or any other type of machine that employs high pressure jets of cold warm or scalding hot water 194 Version 1 0 Prism 2 User Manual Prism 2 Condensed Checklist Not for student or new user use Name Fill O amp Diluent cylinders analyze contents label cylinders with name date contents 0 Pressure psi bar Dil Contents Pressure psi bar MOD Fill scrubber basket with CO2 absorbent amp store in airtight container Label container grade date filled user time used o Date Packed Grade Time Used Time left Check H Plate harness bladder for wear damage or missing parts Inspect counterlungs Inspect counterlung to DSV BOV hoses Inspect DSV BOV Inspect pneumatics Inspect wiring Battery compartment batteries amp o rings Solenoid o
161. ing With this skill we are combining two important skills into one and creating a real world scenario When practicing your setpoint maintenance while remaining stationary you were able to concentrate solely on that single aspect of rebreather diving You have practiced your buoyancy and now have an idea of what the equipment feels like when you are dialed in Start swimming while watching the 3 oxygen sensor displays on your primary and secondary displays verifying that all 3 sensors are at your target setpoint Since you will be swimming 156 Version 1 0 Prism 2 User Manual your oxygen metabolism will increase and your PO will fluctuate if you are changing depths Try to maintain your setpoint within 1 10th of an atmosphere PO Continue watching your oxygen sensors as you work with your manual gas addition valves This skill is as much about building muscle memory instinctively knowing where the gas addition valves are as it is about holding setpoint Don t get frustrated if your setpoint initially swings more than 1 10th ata PO You ll get it Skill 14 Manually maintain setpoint on ascent On ascent our PO will be dropping and our loop volume will be expanding which is exactly the opposite of what happens on descent To begin your ascent watch your secondary display verify that your OPV is opened sufficiently to easily vent the expanding gas and place one hand on the manual oxygen addition valve Begin to slowly asc
162. ing from the loop c manual oxygen addition Momentarily depress the manual oxygen addition valve while watching the O SPG You should hear or feel oxygen enter the loop and the SPG needle should not move d BCD inflation deflation Partially inflate the BCD and then check that all the deflation mechanisms of the BCD are operational and easily accessible e verify SPG s oxygen diluent open circuit bailout supplies Check the pressure in each cylinder and verify that you have the planned amount of gas available in each cylinder Continue breathing from the loop f observe setpoint maintained within user set limits on Primary and Secondary Displays Once you have metabolized enough loop O that the electronics register the drop and fire the solenoid watch how the O sensors react They should not register a large jump in PO but an incremental increase over 3 or 4 breaths back to the active setpoint If you see a wild swing in PO DO NOT DIVE THE REBREATHER as that would indicate a serious problem with the electronics that could lead to possible injury or death Don t forget to do your bubble and cell limiting checks at 15ft 5m and have a safe dive Warning Never begin diving operations until a loop pre breathe has been successfully completed Failure to adhere to this pre dive rule can result injury or death Field Notes Save gas manually inflate the BCD during setup when feasable Version 1 0 137 Prism
163. ing process up to the second horizontal brace then tap to settle the granules as before Repeat the filling process to the top of the bucket leaving a small hill of absorbent on the top Fig 252 Tap and settle the material as before You will probably be ably to settle this material until it is almost level with the basket top Once the basket appears to be full pour a few extra mound of absorbent onto a cup or other small container and put it aside A mask box works well Remove the material you used to block the center tube Lay the top foam pad smaller center hole on top ofthe mound of absorbent and place the basket cover on top of the foam pad Fig 253 Slightly tighten the basket top onto the first threads Do not force the top on If you cannot easily start the top onto the basket threads remove a bit of absorbent and try again Once you have started the top onto the basket threads clean the towel of loose absorbent then pick up the basket by the top horizontal brace and using your thumbs to hold the basket and top together securely lift the basket a few inches above the ground and tap the basket slowly and firmly 3 times on the towel covered ground Fig 254 Never tap the basket on uncovered ground as that can damage the basket to exhale plenum sealing surface Fig 255 The sealing area on the basket must be kept clean of caked on absorbent so don t tap the basket down on loose absorbent Doing so will just make extra w
164. irs of number like 30 85 The default of the system is 30 85 The system provides several settings that are more aggressive than the default Don t use the system until you understand how it works Pressure Graph Gradient Factors Gradient Factor is simply Version 1 0 GF Hi surfacng value maintains safety margin Ambient Pressure absolul Fig 78 rai nio 2 sf 2 0 decimal fraction or percentage af the M value Gradient Gradient Factors GF are defined between zero and one M valua GF Lo GF 1 di Gradient Fi generales T first stop A Gradient Factor of 0 represents 5 the ambient pressure line A E A Gradient Factor of 1 represents 05 the M value line Ey inear function E 5 e for gradual Gradient Factors modify the 764 change in original M value uatians for E p Gradient conservatism within the l gt ie Factors decompression zone 3 The lower Gradient Factor value GF Lo determines the depth of the first stop Used to generale deep stops to the depth of the deepest possible deco stop Graph from Erik Baker s Clearing Up The Confusion About Deep Stops 39 Prism 2 User Manual Gradient Factors Explained By Kevin Watts This primer attempts to provide a user s view of gradient factors an Erik Baker derived method of calculating decompression schedules Back to B hlmann Everything in the
165. is because each part requires either specialized tools or processes to disassemble and reassemble without causing damage or specialized calibration equipment to make sure the part is operating within certain design parameters If you wish to take a factory approved maintenance course that will teach you how to service some but not all of these parts contact your Hollis Prism 2 dealer They can schedule a maintenance course in your area Attempting to disassemble or service any of the above listed parts will void the warranty coverage for those parts Version 1 0 169 Prism 2 User Manual Prism 2 Preventative Maintenance Schedule S Service R Replace Asneeded 12months 36months SYears _ Head inhalation Counterunghose m rR Head to countering hose connector Owings s inhalation Hose Rn Some m Emaon musoma Emaon mushroom va st o Balaton coeg SR Manual Addition vaye wmo s CR Head to Enhalation Coumterung nase s r Exnaust Plenum O Ring NotGaskety Reacozseal Sowers Baxespig iR DI ozeno SR S EEE oz celwiinghamess RR Battery Cap seaing Om SR R
166. it to look at our bail out gases Flipping through the gases with MENU shows that we have three gases available Fig 91 93 Whether they are appropriate gases is a subject for one of the web forums Fig 91 Fig 92 Fig 93 Version 1 0 45 Prism 2 User Manual 46 These are the gases that will be used to estimate TTS in the event that you switch to open cir cuit during a dive The computer will assume that you will switch gases when the PPO of the next available gas is less than 1 61 Automatic decisions of when to switch gases for the TTS calculation means that it is very easy to set up your CC and OC gases There is no need to enter a depth or a PPO to switch gas There is no need to keep track of which gases are turned on and off in which mode If a gas is available in the CC gas list it will be used in CC and it will be used at an appropri ate depth The same is true for OC It is always configured correctly if you actually have the gases you have created If it is necessary to switch to OC while diving button pushes will do it Fig 94 You will be switched to OC and will be using the gas that has the highest PPO less than 1 61 Your OC gas list is likely very different from your diluent gas list but all of the OC gases are automati cally selected and available Now switch back to closed circuit and start the dive Fig 95 Fig 94 Fig 95 We have reached a depth now that will incur decompression soon F
167. ited to transportation shock baggage handler throwing distance competitions driving over rough terrain jolts during heavy seas and extreme motor vibrations It is always recommended that you remove the sensors from the rebreather if it may be subject to any of the above conditions Can I touch the Teflon membrane with my finger How do I clean the sensor and contacts No you must not touch the sensor face with anything especially your fingers Fingers have oils on them even when freshly washed and the oil permanently clogs the membrane destroying the sensor If salt has dried on the sensor face you can gently pour a bit of distilled water on the membrane and allow it to air dry Never use any cleaning solutions on the sensor face You may use an electronics contact cleaner such as DeOxlt Gold on the contact pins but use it sparingly and wipe off all residual cleaner before use Version 1 0 23 Prism 2 User Manual What is the expected oxygen sensor life The operational life of the PSR 11 39 MD sensors are calculated as one year from the date they are put in service The warranty is one year from the date they were shipped from the factory Do not attempt to extend the life of the sensors past one year from the date they were put in service Doing so can result in incorrect or no signal output which can lead to serious injury or death What is the recommended storage temperature During a diving season if one exists for you t
168. ith minimum fluctuation of O Look at your primary and secondary sensor readings to verify your breathing gas is within these limits and the readings are steady you had taken the DSV BOV out of your mouth while on the surface exhale the air in your lungs while you put the DSV BOV in your mouth Continue exhaling through the DSV BOV purge hole to clear any water in the mouthpiece Open the DSV BOV valve and breathe normally Signal your buddy to begin your descent Purge your buoyancy device of air and begin slowly descending using a down line if available to control your descent Don t forget to equalize Field Notes Exhale first The reason you should exhale all the air in your lungs prior to opening the loop is two fold First you will expel any water that may have been in the mouthpiece and second you do not want to introduce any outside gases into the breathing loop unintentionally changing the gas mix Skill 3 DSV and BOV shut down Whenever the DSV BOV is out of your mouth it must be shut down so loop gas does not escape and water does not enter the loop This is probably one of the most difficult skills to get used to other than buoyancy if you are used to working with open circuit equipment Practice the DSV BOV shut down drill until tt becomes second nature An accidentally flooded loop ruins a perfectly good dive Version 1 0 149 Prism 2 User Manual DSV Operation To accomplish the DSV shut down drill
169. ition valve on the inhale counterlung will automatically add diluent as you breathe to compensate for the increased pressure decreased volume in your loop But what about the increasing PO Fortunately this is where the diluting capacity of the diluent comes into play By adding diluent you automatically drop the PO in your loop However when descending on a rebreather you must do so slowly watching your PO on your secondary to make sure it does not go above your set point Should you find that the PO is too high at any point during descent you can exhale from your nose and add a compensating amount of diluent to the loop thereby slightly dropping the PO It is recommended you use a descent line to easily arrest your descent should you need time to adjust your PO to keep it from spiking If you find that your PO has dropped below your setpoint descend until the PO reaches your setpoint You will rarely need to add oxygen during descent Version 1 0 155 Prism 2 User Manual Skill 12 Neutral Buoyancy practice Neutral buoyancy is not something which can be mastered in a classroom We can teach the physics of neutral buoyancy and how to attain and maintain neutral buoyancy but until you are in the water practicing the skill you will not begin feeling it Neutral buoyancy is all about feel As you learned in your open water class you know that inhaling a lung full of gas will increase your displacement of water making you l
170. l almost devoid of contaminants and completely stripped of argon This is because they are manufactured by turning pure liquid oxygen LOX obtained through fractional distillation in a cryogenic air separation plant a far more complex method than Pressure Swing Absorption see pg 70 into its gaseous form Version 1 0 167 Prism 2 User Manual PART 5 MAINTENANCE TROUBLESHOOTING Version 1 0 168 Prism 2 User Manual Before we delve into maintenance of the various parts of the Prism 2 here is a list of parts which ARE NOT user serviceable and must be sent to your local Hollis Prism 2 dealer for service NON USER SERVICEABLE PARTS Solenoid Solenoid Chamber Pressure Relief Valve Primary Display Secondary Display Primary Display Piezoelectric switch Electronics Compartment including printed circuit boards Oxygen first stage Oxygen Pressure gauge Bail Out Valve BOV Diluent first stage Diluent pressure gauge Exhalation Lung Loop Over Pressure Valve OPV Counterlung drains DO NOT ATTEMPT TO UNSCREW THE WIRING FROM THE HEAD THE CONNECTOR IS NOT A THREADED PART YOU WILL DESTROY THE WIRING AND POSSIBLY THE HEAD HOUSING DO NOT ATTEMPT TO UNSCREW THE WIRING FROM THE CORE OR THE SECONDARY DISPLAY THE CONNECTORS ARE NOT THREADED PARTS ATTEMPTING TO UNSCREW THE WIRING WILL DESTROY THE WIRING AND QUITE POSSIBLY THE SECONDARY CASE AND OR CORE HOUSING The reason these parts are not considered user serviceable
171. lation side head connector especially old absorbent particles some absorbent may have fallen into the exhaust plenum Fig 278 which is located on the underside of the head Clean out any debris that may have collected in the exhaust plenum prior to unit assembly Fig 276 addition valve Check the oxygen addition valve on the right counterlung for tightness by holding the base of the valve from the back of the counterlung through the counterlung fabric and attempt to slightly tighten twist clockwise the top of the valve Fig 279 There should be no movement If the valve has come slightly loose hand tighten the valve as needed until it will not turn further See maintenance section for further information Activate the valve button to make sure it operates smoothly It should not feel stiff or difficult to depress You will check the valve again for proper operation X during your operational checks See the maintenance section if the button Fig 279 does not move freely f Automatic diluent addition valve ADV O While holding the valve body located on the left counterlung depress the actuator lever from behind the counterlung Fig 280 It should move freely You will check the valves automatic and manual addition of diluent into the breathing loop during your operational checks For a closer inspection or if you think the valve may be damaged you can unscrew the valve body from the counterlung by turning the
172. leaning you must replace the exhalation side mushroom valve and seat then repeat the test 5 Inspect regulators and hoses 6 steps a 1st stages W Remove the cap on the first stage DIN valve and inspect the DIN fitting for signs of previous water ingress such as discoloration or salt buildup Fig 289 on the filter surface Ifthere are signs of water ingress do not dive the unit until the first stage hoses and pressure gauges attached to it have been serviced by a Hollis authorized repair facility Failure to properly M 9 maintain the first stages could result in free flow of gas into the breathing loop and lead to serious injury or death Verify that the DIN valve s tank O ring is in place and clean Replace it if there are any signs of wear b pressure relief valves Check that the pressure relief valve is in place and the body of the valve has not sustained any impact damage You will verify that the valve is sealed when you pressurize the first stage Should the valve activate and discharge gas suspect a malfunctioning first stage You can verify if the intermediate pressure is outside of operating parameters with an in line pressure gauge outfitted with a low pressure QD fitting c LP low Pressure hoses and connectors W Check each hose leading from the first stages for signs of wear or age Fig 290 Replace as necessary only with Hollis approved parts Check all LP quick disconnect hardware for corrosion and ve
173. les whenever the mouthpiece is out of your mouth Put the alternate air source in your mouth and purge it by blowing air into it or depressing the second stage s purge button Take a few breaths from the alternate air source and then switch back to the DSV Remember to fully purge the air in your lungs by blowing through the DSV purge orifice prior to opening the mouthpiece Failure to do so will introduce a breathing gas with a lower oxygen content thereby changing the mix in your breathing loop and altering your buoyancy If you forget simply exhale from your nose to lower the loop volume then adjust PO as needed For systems using a BOV Exhale fully into the loop and then pull the BOV lever down to the open circuit position Clear the BOV by pressing the purge button on the face of the BOV Take a few breaths then exhale fully and open up into closed circuit mode and breathe normally Skill 7 Manual addition of diluent The Prism 2 comes equipped with an Automatic Manual diluent addition valve ADV located on the front of your left inhale counterlung slightly below the breathing loop elbow During descent as the volume of gas in your loop decreases the automatic diluent addition valve will add gas volume to the loop when the actuator in the valve hits the strike plate inside the counterlung However there may be times you want to add additional diluent to the loop manually such as when you want to fly the rebreather at a
174. lk of the system will mostly disappear It is important that you spend a moment adjusting your buoyancy to accommodate the added weight of the off board cylinder If you find that you are having difficulty carrying the added weight on the surface carry the bailout tank to your ingress point before donning the rebreather and then clip the bailout tank on once you are in the water Your instructor can help you do this until you become familiar with finding the D rings by feel It is far better to stage your equipment close to the water and get assistance than jump in the water already exhausted from unnecessary exertion Before beginning your dive turn on the bailout tank valve and fully charge the regulator Verify that the bottle is full by checking the pressure gauge then shut off the valve leaving the regulator fully charged We turn off the air so there is no chance that a leak or free flow can drain the air from the system while we are entering the water We leave the regulator charged so if you do need to suddenly switch to your bail out during entry there is at least 1 breath available to draw from while you are turning on the tank Once underwater turn the bailout tank on and do not turn it off until you are out of the water Your Instructor will demonstrate the skill then will give you the out of air signal Pull the regulator second stage hose free from the elastic hose stowage cords Make sure the second stage is right side up and place
175. llow excess fluid to drain out then place the hoses in the disinfectant making sure there are no air pockets trapped in the hose Remove the hoses and mouthpiece from the disinfectant and hang to dry Remove counterlungs disinfect hang to dry Remove both counterlungs from the harness and drain any left over fluids by turning the lungs upside down and allowing the fluids to drip out of the hoses Pour of the disinfectant from the bucket into each counterlung then slosh the liquid around inside the counterlung and hose Drain the disinfectant and hang the lungs to dry Version 1 0 Prism 2 User Manual Field Notes Why disinfect your loop daily rebreather loop collects all sorts of biological material during a dive There is your saliva Which fortunately is composed of 98 water However the other 2 consists of compounds such as electrolytes mucous blood and various enzymes that normally begin the process of breaking down food and probably food particulates Then you add in seawater if you are diving in the ocean or freshwater both of which contain living and dead microscopic creatures Add the two together and you get a solution of microscopic creatures undigested food particulates and various bodily fluids Now imagine allowing this solution to sit and putrefy for a few days in a dank dark hole all the while collecting more and more dead and dying biomass while you continue diving Would you knowingly want to bre
176. lue without calibration Fig 111 If this was the display it would indicate a faulty sensor It is not within the expected range for a sensor in oxygen Most sensors are designed to output 10 mV 3 mV in air If the output is linear then that trans lates to a range of 30 to 70 as valid mV readings in 98 oxygen The computer will refuse to calibrate outside that range Fig 112 Three sensors all showing FAIL is usually caused by an accidental calibration in air A failed calibration can only be fixed by performing a successful calibration Fig 113 Fig 113 Version 1 0 49 Prism 2 User Manual External Battery Solenoid Battery Alerts The two 9 volt batteries located in the battery compartment in the head drive the Watt Miser 0 65 watt solenoid The operating range of the solenoid is from 9 volt to 7 volt at which time the user will get a low battery alert on the Secondary Display The battery is measured by the computer while the battery is under load Failure to change the battery after a Low Battery alert will result in the solenoid eventually discontiniung operation DEPTH TIME STOP TIME Low Ext Battery when battery falls below operating threshold 7V 1 DEPTH TIME STOP After user confirms the small red 2 text persists as long as the low bat im tery condition remains O2 HE NOL CC 10 50 If the battery falls so low that the 3 solenoid does not fire or current falls out of range
177. lunger for free movement 3 Check diluent first stage IP ADV is not adding gas 1 Actuate Inflator to check for flow from diluent first stage 2 Check plunger for free movement 2 Check Schrader valve 182 Version 1 0 Prism 2 User Manual PART SIX ADDENDUM 192 Version 1 0 Prism 2 User Manual Component Capacities BUCKET CAPACITY Total Capacity 1 75 gallon 6 6 Liter To measure 1 Gal 3 8 Liters for mixing sterilizing agents in the field fill bucket with fresh water to 3 4 19mm under bottom of the SS bucket latch strap Counterlungs 3 9 Liters complacent volume per counterlung On Board gas cylinder carrying capacity Standard configuration Up to 50 Cu Ft L Breathing Hoses 1 1 2 X 15 Oxygen Sensors Analyitical Industries PSR 11 39 MD Operational Temperature Range 32 F 0 C 122 F 50 C Operational Voltages Air 8 5 14mV 100 0 40 6 6 7mV Version 1 0 193 Prism 2 User Manual List of approved products for use in your Prism 2 Rebreather Cleaning Products Steramine 1 G Tablet 100 White Vinegar Dawn or similar dish detergent Maintenance Products Food Grade Silicone based lubricants non O clean parts only Cristo Lube Tribolube DeoxIT Gold G5 Electrical Contact Cleaner Other products not listed may be appropriate for use with the Prism 2 If there is a particular product which you wish to use please call the factory to make sure the product does not conta
178. lungs Conversely maximum loop volume is the volume of gas in the breathing loop when the counterlung s are maximally inflated and the diver has maximally inhaled gas into his or her lunas Although the magnitude of the difference between these two volumes CV max Fein will vary from one rebreather design to another it will always be non zero Rebreather divers must learn to maintain the loop volume close to its optimal level for their particular model of rebreather If the volume is maintained too close V niit the counterlungs will tend to bottom out on a diver s full inhalation If the loop volume is maintained too close to V ax the overpressure relief valve will tend to vent excess gas at the peak of a diver s full exhalation Furthermore total loop volume will influence work of breathing due to hydrostatic effects On rebreather models with a relatively large value of V max the optimal volume should ideally be closer to Mi for models with a relatively small value of Fmax the optimal loop volume should be ideally close to the mid point In either case the diver should maintain the loop volume at whatever level results in the minimum total work of breathing and gas loss 154 Version 1 0 Prism 2 User Manual Skill 10 Manually maintain set point while stationary Manually maintaining set point is simply a function of replacing the oxygen in the loop as it is metabolized As
179. lungs Make sure the rings are firmly welded to the counterlung fabric Fig 273 d breathing hoses Oetiker clamps amp o rings W Check the counterlung to head hoses for holes wear or age cracking Fig 274 Stretch the hose slightly and inspect the rubber material If you can see separation or light spiderweb cracking in the rubber it is beyond it s serviceable life and must be replaced Never dive with breathing hoses that show signs of rubber ageing as immediate and catastrophic loop flooding will occur if the hoses fail during diving Fig 274 Fig 275 Version 1 0 101 Prism 2 User Manual Wipe the interior surface of each breathing hose with a clean dry towel then look at the spot on the towel where you wiped the hose interior Fig 275 the towel has foreign particles or dirt on it re clean the counterlung and hose using a bottle brush to remove any foreign material in the hose corrugations see maintenance section for further cleaning instructions The counterlung to head attachment hardware has an O ring seal Fig 276 Remove clean and prepare the O ring s O ring grove and mating surface for use or replace if worn or damaged Also at this stage you will want to make sure there is no debris in the hose connectors on the head Fig 277 Locate the two hose connectors on the head and run your finger inside them If you feel any debris clean the inside with a lint free cloth If there was any debris on the exha
180. m time respiratory minute volume and PPO Note Residual tissue loading and CNS from recent dives will be used in calculating the profile DURING A DIVE Computes the decompression profile assuming the ascent Dive Plan Setup will begin immediately There are no settings to enter Fig 139 RMV is last used value LIMITATIONS The Secondary Display Dive Planner is intended for simple dives Multi level dives are not sup ported The Secondary Display Dive Planner makes the following assumptions Ascent and descent rates are 33ft min 10m min For the gas in use will be the gas with the highest PPO less than 1 61 e For CC the gas in use will be the gas with the highest PPO less than 1 05 Last stop is 10ft 3m e For CC the PPO is constant for the entire dive The RMV is the same while diving as during deco Version 1 0 of Prism 2 User Manual The Dive Planner does not provide any validation of the profile It does not check for nitrogen narcosis limitations gas usage limitations CNS percentage violations or isobaric counter diffusion violations due to sudden helium switches The user is responsible for ensuring a safe profile is followed RESULT SCREENS Fig 140 141 The results are given in tables showing Stp Stop Depth In feet or meters Tme Stop Time In minutes Run Run Time In minutes Qty Gas Quantity in CuFt or liters OC and BO only The first two rows are sp
181. mecdaately Hh WAEL ami zeek medical advice 5 37739 Wear pres and EveJLace 5 45 In caue atf accent if xm feel orwell medical advire and show label if 16 Other mim maton The intended n if product 15 az an for Carbon Decide It gx sahe The above PEGs curent Sale IH and iz prirvuled m an Tau Tha documem only gusdie ii the precam kir of the material Ir a property trained perse Er 15 the af the Customer ip text weiber the product Tor the paper mended by the Date of ime 14 may 2010 Contact Make Tet Quality and zpecialied H596563961 E mail Ti esac cok ar general info teers FiCAl co nk Version 1 0 207 Prism 2 User Manual SDS Material Safety Data Sheet Complies with J Hasard Coeemoieation Jtaodard ZICER 1910 1200 DATE PREPARED 01 10 2010 1 STEBAUINF 1 TAHLETS BEG W4 l581 11l This prng nrt is registered and rEqgnlated by noder FIFRA andi regolated by EDA noder nbpart F of The Food Additives Amendment TIE Tablets are dissolved in water proride 1 solutions Eor Food contact surface sanitisimy in the food service indina 7try MANITE
182. n s M values Gradient factors are calculated as follows Tissue Compartment Pressure Ambient Pressure Gradient Factor MValue Ambient Pressure What does this formula tell us First the gradient factor formula tells us that at a Gradient Factors of 1 0 GF 1 0 you are at B hlmann s M value Therefore staying at or below 1 0 seems important Second it tells us that when our tissue compartment pressure just reaches ambient pressure then the GF 0 0 Another ascent strategy then might be to shoot up to a GF 0 8 and ascend in such a way as to 40 Version 1 0 Prism 2 User Manual not exceed that value In this way you know that your tissue compartments are never over 80 of the distance between ambient pressure and B hlmann s M value In essence you have a 20 safety margin on B hlmann s M value Dive computers implementing gradient factors usually let you set two gradient factor parameters Moving straight to GF 0 8 would be equivalent to setting your dive computer to 80 80 Erik Baker s Strategy Erik baker didn t like the idea of ascending directly to a GF close to B hlmann s M value Instead he said let s all ascend first to a lower GF then slowly move to higher GFs So let s say you want to first ascend to a GF 0 30 and then slowly move to reach GF 0 85 as you surface This setting on your gradient factor computer is 30 85 The Prism 2 secondary uses 30 85 as its default setting So what is happening when
183. n will take you into the menu and a push on both buttons will show the millivolt display The error message will keep returning until it is dismissed with a SELECT This message will appear if the average PPO goes above 1 6 for more than 10 seconds It will come back after being dismissed if the situation occurs again Fig 224 This message will appear if the average PPO goes below 0 4 for more than a few seconds It will come back after being dismissed if the situation occurs again It is not unusual to get this error immediately after submerging with Fig 225 a hypoxic mix The first breath after submerging floods the loop with low PPO gas The situation is usually resolved by increas ing depth such that when the error is noticed the PPO is no longer low This condition will also cause the LOW PP OXYGEN display to appear Here the computer does not have two sensors that have confirming values There is no way to know the actual PPO and the average PPO will be calculated as 0 00 Fig 226 This message will appear when your internal battery reads less than 3 2V for 30 seconds The battery needs to be changed The computer will also flash the battery symbol red Fig 227 Version 1 0 79 Prism 2 User Manual 80 This alarm is a notification that there has either been a very fast ascent for a short period of time or that there has been an ascent of more than 66 fpm 20 mpm maintained for over a minute
184. n you attempt to breathe in If you suspect an inhalation side leak bail out immediately and signal your buddy to have a look in your clear bucket A hole or tear in either inhalation side breathing hose will also cause water to leak into the counterlung but if the leak is in the DSV inhalation hose the water will also drain directly into the mouthpiece Lastly the counterlung or the attached hardware itself could be leaking Check that the silver locking collar on the counterlung drain is tight Check that the ADV and hose elbow are screwed down completely Version 1 0 159 Prism 2 User Manual Skill 16 Diving with off board open circuit system bailout tank Up to this point in your training you have been using your on board diluent as an emergency bail out system for dives down to 60fsw 18msw if so equipped We will now introduce into your kit an off board bailout system for dives deeper than 60fsw 18msw The Prism 2 has D rings incorporated into the design specifically for use with a bailout tank The tank must have the necessary attachment hardware installed for you to clip the bottle to the D rings Always clip the tank with the valve facing forward This will make it easy to verify that the air is on and remove any entanglements that may occur during a dive Adding an off board bailout system to your rebreather will add weight and bulk to the system on the surface but you will find that once underwater the added weight and bu
185. nds upon start up the primary display battery must be changed before diving 33 Calibrate LED primary display Press the Primary Display power switch 3 times in rapid succession within 1 second to lock in the calibration All three LEDs will turn red for 5 seconds then begin reporting their PPO s It may take some practice with tapping the switch quickly to get the Primary Display to calibrate Warning The Primary Display will only give a battery warning on start up and will not alert the user to a critically low battery while diving Therefore you MUST change the Primary Display battery whenever the electronics blink the 3 LEDs orange for 30 seconds upon start up 34 record oxygen pressure after loop flush psi bar Record the pressure in the oxygen tank after the loop flush This will give you a good indicator over time of how much O is usually needed to do a good flush of the loop For instance if you find that you normally use about 200psi 13 8bar O during a flush but notice that the last flush Version 1 0 131 Prism 2 User Manual only used 50psi 3 4bar this may be an indicator that you did not fully flush the system prior to calibration Plus recording O pressure will remind you just how much O2 you have in the cylinder 35 Solenoid check 3 steps This step will check that the solenoid is adding oxygen to the breathing loop when it fires a setpoint to high gt 1 0 The active setpoint is presently 19 which
186. ng which mates to the hose fitting Because the O ring is static does not encounter movement it is not usually a point where you might find leaks However it is always a good idea to clean the O ring during a thorough leak diagnosis If you remove the valve seat for inspection or repair you must clean and prepare the O ring s O ring grove and mating surface for use or replace if worn or damaged 4 Inspect DSV BOV 5 steps a shut down OC assembly O Open and close the DSV BOV to make sure the inner barrel operates smoothly and does not bind If it is hard to open or close or if you hear a scraping sound during barrel movement the DSV BOV will need to be serviced DSV There are three sealing O rings on the DSV rotating barrel Fig 287 You will be checking the sealing of these during your positive and negative pressure tests If any of these O rings should fail you will need to service the DSV Check the maintenance section of the manual for further Fig 287 information BOV The BOV barrel is a 3 position barrel Rotate the barrel fully through all 3 positions making sure that it stops in place prior to rotating back up into the fully closed not closed circuit position and that pulling up on the knob releases the barrel to travel into the closed position b water drain On the underside of the DSV BOV you will see a small hole just under the mouthpiece Fig 288 This is the water drain hole
187. ngs to dry while blocking bugs from getting in and making a home Version 1 0 177 Prism 2 User Manual Manual Oxygen Addition Valve Use O Clean Lubricants only Tools needed Oeteker clamp pliers flat head screwdriver Tribolube clean lint free towels Because the Manual Oxygen Addition Valve is exposed to pure oxygen all parts of the valve must be treated as oxygen clean parts If contamination is suspected all parts must be O cleaned as part of the maintenance routine The Quick disconnect gas inlet fitting is threaded into the valve body and is sealed with an O ring You do not normally need to remove this part unless the entire assembly requires O cleaning To disassemble the valve from the valve body depress the valve button to lift the c clamp off the valve body Using a small screwdriver pull the c clamp off the valve stem There is a spring on the underside of the valve button that will cause the valve stem to separate from the valve body once pressure is slowly released from the valve button Both the C clamp and valve spring are made from Stainless Steel however if there are signs of Rouging a patina of rust on the surface of either piece that piece should be replaced Rinse both parts in fresh water and set them aside The valve stem has two O rings The O ring closest to the valve button keeps gas from escaping out into the water column The O ring closest to the C clamp channel on the valve stem keeps gas f
188. nly packed open the basket add some more absorbent and repeat the process then check firmness again Once the basket is packed to your satisfaction use a clean paper towel to carefully remove any dust collected on the outside of the basket Collect any left over absorbent that you had set aside for packing and if it is not dusty you may pour it back in the absorbent container Seal the absorbent container and store it in a cool dry place Field Notes There is no set number of times you will need to remove the basket top to add material but spending more time settling the material as you fill the basket will help reduce it Pre Packing the Prism 2 Scrubber While pre packing the scrubber well in advance of a dive or transporting packed scrubbers is not advised due to potential absorbent settling issues we recognise there are instances where packing a scrubber on site is either impractical or impossible If you will not be using the packed scrubber immediately put the basket in an airtight container and seal it Put tape across the seal on the outside of the airtight container and write your name the date you packed the basket and the absorbent material used Fig 256 Since this is a fresh fill write O hours used on the tape Store the container in a cool dry place Fig 256 88 Version 1 0 Prism 2 User Manual After short term storage or transportation you must check the scrubber for settling or loose scrubb
189. nt of water Remember to exhale tiny bubbles whenever the mouthpiece is out of your mouth To purge the water simply replace the DSV BOV in your mouth and blow a small amount of air into it with it in the shut position This will force the water through the purge hole in the bottom of the DSV or through the drain valve in the BOV As soon as you see or hear bubbles coming from the purge hole drain switch the DSV BOV to closed circuit mode and resume breathing normally Field Notes Unlike Open Circuit systems there is no purge button on the DSV to purge water from the mouthpiece if you do not have enough breath in your lungs If you ever find that you have removed the DSV BOV from your mouth but do not have enough gas to manually purge it switch to your on board alternate air source see skill 6 below take a breath from it switch back to the DSV BOV and purge Remember to fully exhale that breath through the purge prior to opening the DSV BOV Skill 6 Emergency Bailout Onboard breathing gas If you have equipped your Prism 2 diluent side second stage you will practice switching between the breathing loop and the second stage to simulate an emergency bailout If your Prism 2 is not equipped with an onboard bailout you will skip this skill For systems using DSV Version 1 0 151 Prism 2 User Manual First locate the second stage then close down the mouthpiece and remove it from your mouth Remember to blow tiny bubb
190. ntinuously even when on the surface and turned off Removing the battery will reset the CNS percentage Setpoint The current PPO setpoint Displays in Yellow when the setpoint is 0 19 Fig 71 Average The average PPO of the current breathing gas Fig 72 In OC mode displays in Flashing Red when less than 0 19 or greater than 1 65 Fig 73 In CC mode displays in Flashing Red when less than 0 40 or greater than 1 6 In CC mode averages all sensors that are not voted out Fig 74 Diluent PPO Fig 75 Only displayed in CC mode Displays in Flashing Red when the partial pressure of the diluent is less than 0 19 or greater than 1 65 Gas PPO Fig 76 Only displayed in OC mode Displays in Flashing Red when less than 0 19 or greater than 1 65 Gradient Factor Fig 77 38 Fig 67 N at 9 om N Version 1 0 Prism 2 User Manual Decompression and Gradient Factors The basic decompression algorithm used for the computer is Buhlmann ZHL 16C It has been modified by the use of Gradient Factors that were developed by Erik Baker We have used his ideas to create our own code to implement it We would like to give credit to Erik for his work in education about decompression algorithms but he is in no way responsible for the code we have written The computer implements Gradient Factors by using levels of conservatism The levels of conservatism are pa
191. ny material or repair failure during diving operations would cause the absorbent to spill out of the basket resulting in an instant and catastrophic CO bypass Warning Never attempt to repair or dive a scrubber basket that has torn mesh Doing so could lead to injury or death b center tube O ring 1 The center tube screws into the basket base and is sealed with an O ring You do not normally have to remove the center tube for cleaning but if you do remove clean the O ring O ring groove and mating surface for use or replace if worn or damaged It is neither necessary or advisable to lubricate the center tube O ring N You must insure that you replace the center tube O ring during assembly Failure to do so could allow some gas to channel through the top of the scrubber c top and basket threads clean O Keeping the scrubber clean is very simple but one of the problems between cleanings is crushed absorbent dust caking up in the scrubber basket threads Fig 313 The more humid the environment in which you are packing your absorbent basket the more you will find the material is building up in the threads While not a safety concern in and of itself caked on absorbent can make it more difficult to screw down the top of the basket which can be a safety concern if the basket top is not fully engaged onto the threads 116 Version 1 0 Prism 2 User Manual The easiest way to remove absorbent that h
192. o scratch the mounting hardware Remove clean and prepare the O ring s O ring grove and mating surface for use or replace if worn or damaged To clean the O ring grove you can use a Q tip Fig 284 but be careful not to allow cotton fibers to remain behind If there are dirt particles on the O ring when you remove it from the grove dis assemble the threaded counterweight side of the DSV BOV hose assembly by removing the Oetiker clamp and thoroughly clean the O ring grove Fig 284 d inhalation hose mushroom valve only on inhalation hose for DSV supplied systems O W If your Prism 2 is supplied with a DSV the inhalation side breathing hose will house a one way mushroom valve Fig 285 The inhalation mushroom valve on BOV supplied systems is housed in the BOV on the inhalation side of the BOV body To test the sealing integrity of the valve place your the hose elbow on your mouth and put the DSV counterweight in your other hand While looking at the mushroom valve gently inhale You should see the mushroom valve seal around the outside surface of the 6 spoke mushroom valve seat Fig 286 You should not feel or hear any air movement from the valve If you can inhale air clean the mushroom valve and seat with water If it continues to leak after cleaning Fig 285 104 Version 1 0 Prism 2 User Manual you must replace the valve and possibly the valve seat then repeat the test The mushroom valve seat has an O ri
193. on 2 Version 1 0 Prism 2 User Manual Vacuum cr See up mars place inim zentable 7 Handling and Storage Wash Us wath zul cee necrary rker rnexapan Dn nc um sinn ar an rotas Do mot mak De nat aller contact wath water Eccp rum contact wilh rad and iram Sto 2 DOR rhy wel arra zer Geo Soe Errp Tom stro Sir pouiecied marker Sore ab fore AP in HG dere cmt Faris Slog cr the be wuh an 8 Exposure Controls Exposure of components where relevant Ey Weal Chemical safety enpeles Sm Wear Moves Hr revenu expoure Chote Wear pre ve to eve skin exporere Rezpsratersz Not necexrary zs 1x m pellet form IT deest pened dut type 3M H7 EIE 9 Physical and Chemical Properties Pipal Stube Soll cote of 1 ches Higdraxidc dirranrpuses in CaO at appear y SOC Erge Na at very ish opr Version 1 0 205 Prism 2 User Manual 206 Famm bikr of chores er rium 2 10 Stability and reactivity Sahiy Sale ic rura ue Sonos
194. onents include the cylinders we choose to dive with lights fins backplates and lead ballast that we carry with us These components may be distributed from side to side and head to toe Improper distribution will result in non horizontal trim Too much lead at our waist will tend to drag our hips down resulting in a head up position in the water fig S2 Fins that are too light will result in a feet up position Divers often instinctively compensate for weight placement problems by arching their backs to maintain trim The objective is to allow proper trim with a relaxed posture in the harness Of course proper weighting is key we should be able to maintain a 10 foot stop with no gas in the wing and a comfortable amount of gas in our exposure suit With the CCR we have to account for the gas volume in our breathing loop typically recommend starting with an extra 4 Ibs over what the diver would normally wear with a single tank open circuit rig as a Starting point Divers with larger or smaller tidal volumes will need to adjust accordingly 18 Version 1 0 Prism 2 User Manual Our buoyancy components include our exposure suit our wing and our counterlungs Minimizing the gas volumes in each will go a long way towards minimizing the effects of Boyle s Law The larger the gas bubble the harder it is to control The shallower you are the more pronounced the effects of Boyle s Law careful attention to controlling the gas volumes in our
195. oning rebreather has been disassembled at any time This is the most critical part of the entire set up process since a non functional rebreather will always become evident at some point as you go through the operational checks Do not dive the rebreather if it has not passed every step of this checklist Immediate pre dive checks amp system settings These are the final few checks done with the unit secured to your body before jumping in the water While most checks are verifications of previously checked items it is absolutely imperative that you check these again before entering the water Version 1 0 97 Prism 2 User Manual An O ring cleaning primer O Rings are an integral component of almost every part of a functioning rebreather and as such you must be adept at properly inspecting and caring for them For the sake of brevity we will give you a generic description of how to prepare the O rings in the Hollis Prism 2 for use below In the checklist step by step to follow unless there are unusual design issues access or handling considerations for a particular O ring we will simply state Remove clean and prepare the O ring s O ring grove and mating surface for use or replace if worn or damaged Remove the O ring from the O ring channel using a non metal O ring removal tool Fig 258 being careful not to over stretch the O ring Never use a sharp metal O ring pick or any metal object as that can damage the O ring
196. ontamination as all parts must remain oxygen clean Refer to maintenance section for further information 6 Inspect wiring 2 steps a LED primary display W Check the LED primary display and wiring for damage Turn the unit power on and verify that all three of the LED s illuminate Fig 291 If all three lights continuously blink orange for 30 seconds the primary display battery must be changed Once checked turn off the LED Primary Display See the primary display light states section of the manual for display explanations b secondary display W Inspect secondary display and wiring for wear or damage Turn on the secondary display by depressing both the menu and select buttons Fig 292 After the splash screen the system will switch to the main information screen Leave the Secondary Display powered on to complete the battery checks step 9 below Fig 292 Version 1 0 107 Prism 2 User Manual 7 Battery compartment batteries amp O rings 4 steps W a solenoid batteries The solenoid runs on two 9V alkaline Duracell or equivalent quality only batteries wired in parallel and located in the battery compartment of the electronics housing Fig 293 With the secondary turned on from the previous step depress the select button six times until you see the bottom of the screen display the voltages for the external battery solenoid and the internal battery display Fig 294 A voltage above 7 as reported
197. ork and make any post packing scrubber basket cleanup take longer Field Notes Resist the urge to blow on the packed basket to get rid of dust as the dust will get in your eyes nose and throat Version 1 0 87 Prism 2 User Manual 3 Taps then Turn Once you have tapped the basket 3 times on the ground turn the basket top until in makes contact with the absorbent Do not force the top Tap 3 times again and turn the top Repeat this process until the top is sealed completely on the threads Using the 3 tap and turn method will insure that you do not overpack the bottom of the basket while leaving the top material loose Also making a repeatable process your habit will insure that all you are packing your scrubber the same each time Arbitrary methods lead to arbitrary results Remove the top and foam pad and using more of the absorbent you set aside on the paper refill the basket until you again have a small mound of absorbent on the top Replace the foam pad re seat the top on the basket threads and repeat the process Once you have fully seated the top onto the basket a second time check the firmness of the material The top and bottom of the basket should be equally firm and you should not be able to displace absorbent grains by applying moderately firm pressure against the mesh If the top is not as firm as the bottom turn the basket upside down and tap three times on the basket top If the material is still loose or uneve
198. ormat One thing that became clear to us as we talked to rebreather divers about their use of checklists was that a simple one size fits all checklist often does not follow the stages in which they normally set up their rebreathers The checklist becomes an encumbrance to safety if divers have to skip around the checklist ticking off only those items needed to get to the next phase For instance some divers set up and test their rebreather days in advance of the dive and leave the rebreather assembled during transport to a dive site A start to finish checklist may not take into account the checks required once the unit arrives at the site We have broken the Prism 2 checklists into 4 distinct sub lists which should follow the steps encountered in the majority of real world diving situations If over time you find that this checklist does not meet your needs call us and we will work closely with you to personalize a factory approved checklist for your diving needs To follow is the group of 4 expanded checklists which includes the incremental steps you need to complete to accomplish each step on the checklist We have also included the more commonly seen condensed list which you can find in the Appendix that lists all the same tasks but not the incremental steps to complete each step We include this with the rebreather for field use as a reminder list only It is always recommended that you use the expanded checklist whene
199. ose and a pressurized oxygen cylinder to the solenoid and power up the Prism 2 to check that the solenoid is firing and adding O to the breathing loop Install the oxygen supply hose onto the solenoid Install an oxygen cylinder onto the oxygen side first stage This is temporary and you will be removing the O tank after this test so you can leave the tank on loosely Fig 298 Slowly open the O tank valve to charge the lines then close the valve Turn on the Secondary Display and change the setpoint to either low or high setpoint Listen for the solenoid firing and watch the oxygen pressure gauge You should see the pressure in the lines drop as oxygen is injected into the head Allow the solenoid to continue firing until the pressures in the lines are drained Remove the O first stage from the tank valve and the supply hose from the solenoid If you can hear the solenoid click but the pressure in the lines does not decrease as shown 110 Version 1 0 Prism 2 User Manual on the pressure gauge most likely you have a clogged flow restrictor If the solenoid does not fire make sure you have selected an active setpoint Remember if all 3 cell outputs read Tail there is no valid calibration stored in memory and the solenoid will not fire regardless of the active setpoint If all the O sensor readings on the secondary show fail you will need to calibrate the unit prior to verifying solenoid operation If the Secondary Displa
200. ou are in an upright position You may find that when you change from a horizontal to vertical position while diving the OPV will automatically vent gas This is normal and is caused by the change in static loading Adjust the valve as needed to maintain a comfortable volume of gas in the loop see Field Notes below Version 1 0 153 Prism 2 User Manual During ascent to the surface you may want to fully open the OPV to allow the expanding gas in the loop to quickly bleed off However because the oxygen manual addition valve is on the same counterlung as the OPV when manually adding oxygen during ascent you will want to add oxygen after the valve has purged excess pressure Otherwise your added oxygen will simply bleed out of the OPV and not enter the breathing loop and not increase the PO You can also exhale excess gas volume from your nose to keep the OPV from actuating while injecting oxygen Oxygen injected by the solenoid will not be affected as it is injected in the exhaust plenum after the OPV Minimum maximum and optimal loop Volumes and work of breathing By Dr Richard Pyle The volume of gas contained in a rebreather loop the hoses canister and counterlung s of the rebreather plus the diver s lungs is seldom fixed define minimum loop volume as that volume of gas occupying the rebreather loop when the counterlung s are completely bottomed out and the diver has completely exhaled the gas from his or her
201. ounterlung depending on how much water has entered If you are in salt water you may see that the fluid exiting the drain creates a halocline salt water mixing with fresh water as it vents If you are absolutely positive that no draining is occurring you may increase the pressure in the loop slightly by adding a small amount of diluent too increase loop pressure and help fluid out of the drain Watch your buoyancy though as adding diluent will increase your positive buoyancy Warning Inhalation lung flooding If you find a lot of water collecting in your inhalation counterlung during a dive this IS NOT normal and indicates a potentially dangerous leak in the loop If you find water building up in your inhalation lung immediately switch to your bailout and abort the dive Once safely on land track down and repair the leak prior to diving again There are four areas where water could be entering the inhalation side of the loop and draining into the inhalation counterlung The first and most critical area would be the absorbent bucket A leak here would soak the CO absorbent and create a caustic fluid which will then travel into the inhalation counterlung And If left unchecked eventually into the divers mouth causing skin burns and great discomfort if not serious injury See medical directives in MSDS Usually these types of floods occur slowly enough that you will notice the work of breathing getting harder and you may hear gurgling water whe
202. our Prism 2 cannot be overstated If you have not set up your Prism 2 using the checklists DO NOT dive the rebreather An hour after lunch he dons the rebreather and enters the water After completing his 15ft checks he descends to 35 feet whereupon he begins to feel short of breath Still clear headed enough to realize this could possibly be a sign of CO toxicity and deciding to err on the side of caution he bails out to open circuit and aborts the dive Once safely back the diver disassembles the unit and finds that an O ring sealing the breathing loop is missing allowing his exhaled gas to bypass the scrubber completely and enter the inhalation side of the rebreather Fortunately due to his quick actions this incident resolved without tragedy Lessons learned In his on line report the diver stated he had learned a hard lesson from this life threatening incident The first and most obvious was he had not followed his training relying on his memory instead of using the checklist He also reported that to be honest this was not the first time he had skipped using a checklist He vowed never to make that mistake again Field Notes Don t allow yourself to become rushed or distracted when setting up or working on your rebreather An inattentive rebreather diver is an accident waiting to happen Take your time while setting up your rebreather and when diving 90 Version 1 0 Prism 2 User Manual Why a multiple list f
203. out deep stops and Understanding M values available on the web 42 Version 1 0 Prism 2 User Manual The VPM B algorithm requires an activation code which cen be purchased at additional expense To activate the VPM B decompression algorithm contact your Hollis Dealer VPM B GFS EXPLAINED 8n 100 120 140 1 a Buhlmann Gradient exceeds 9044 on l The VPH B GFS profile limits te gradient this profile 1 to 909 extending the shallow stops pe VPM B Profile 1 WPNE Profle t Az MiB Pronte VO AGES Bulimann Grad erit 9 1 Bu imann Gradent re oradent a VPM B Profile b VPM B GFS Profile Gradient Factor Surfacing GFS adds conservatism to the shallow stops of a VPM B profile In the pure VPM B profile the Buhlmann ZHL 16C Gradient exceeds 90 On the VPM B GFS profile the shallow stops have been lengthened because the gradient is limited to 90 GFS adds more time to dives that require more decompression Dives with deco times under 45 minutes are typically not affected The GFS gradient factor can be adjusted from 70 to 99 The default is 90 NOTE For VPM B higher conservatism values are more conservative The most aggressive settings is 0 and the most conservative is 5 The default is 3 For the GFS value higher values are less conservative The most aggressive setting is
204. out system It may be preferable under certain circumstances to unclip the bailout system and hand it off to the out of air diver once they are breathing from the second stage Once you have handed off your bailout system you must begin your ascent to insure that you reach the surface safely with whatever diluent remains in your onboard tank Remember you only have the small amount of diluent which remains in your on board tank to get you to the surface if you too have an emergency Your instructor will give you the out of air signal and have you deploy your bailout regulator Once your buddy or instructor is breathing comfortably on your bailout regulator and has given the OK signal unclip the tank and hand it off Once you have completed the skill successfully your instructor will hand back your bailout system for you to secure back onto you kit Skill 18 Valve shutoff drills In the unlikely event that one of the two pneumatic systems oxygen diluent on the Prism 2 loses containment you would want to first isolate which system is leaking so you can make a judgment on how to safely return to the surface Since we are most concerned with preserving our bailout gas turn off the diluent tank first Version 1 0 161 Prism 2 User Manual Diluent Pneumatics If the diluent system is found to be leaking but the oxygen side appears fine you must abort the dive but you can stay on the loop during your ascent to the surface Since you won
205. owing page Fig 3 Exhaust Plenum Fig 5 Once the exhaled gas enters the head it travels into the exhaust plenum which is also where O injected by the solenoid enters the breathing loop The exhaust plenum sealing gasket sits in a groove at the end of the exhaust plenum facing the scrubber basket The Red CO sealing gasket must be in place at all times WARNING Breathing from the Prism 2 without the Red CO Seal in place will result in 100 gas bypass of the scrubber 4 Version 1 0 Prism 2 User Manual Fig 6A Fig 6 Version 1 0 Prism 2 User Manual The Scrubber The gas leaves the exhaust plenum and enters the radial scrubber basket through its center tube Fig 7 As the gas radiates outwards through the CO absorbent and towards the bucket walls exhaled CO is chemically removed in an exothermic reaction and any added oxygen is mixed with the loop gas as it travels through the scrubber granules Upon exiting the scrubber the heated gas enters the thermal air jacket area between the basket and bucket Fig 7 The air jacket serves two purposes First it insulates the scrubber material from colder external temperatures which helps increase the efficiency of the scrubber secondly the moisture in the heated gas exiting the scrubber condenses along the bucket walls as the gas cools dropping the overall humidity of the gas entering the oxygen sensors area From the thermal jacket the g
206. peration Inspect head assembly Oxygen sensors Bucket assembly Basket assembly Install head assembly onto H Plate Install bladder yoke and backplate onto H Plate Run pneumatics lines install solenoid gas hose Attach counterlungs to yoke Install counterlung to head breathing hoses Attach gas supply lines to diluent and oxygen addition valves on counterlungs Assemble DSV BOV and hoses check and install Clean head to bucket sealing rings and channel and lube o rings Clean Red CO2 Seal and secure in place Check filled CO scrubber basket Install bucket moisture pad Place CO basket in bucket confirm center tube opening up mount and seal bucket to head Install filled and content verified gas cylinders Record O cell mV in air 1 2 3 Positive pressure test Diluent system leak test Negative loop pressure test ADV test Oxygen system leak test Solenoid test Flush loop with O Calibrate Secondary Display electronics Record cell mV O Linearity Check 1_ 2 3 air mV X 4 76 10 LED Primary Display on and battery check OK replaced amp OK Calibrate LED primary display Solenoid batteries check JOK replaced amp OK Secondary display battery check JOK replaced amp OK Adjust user selected low high set points to desired settings 0 4 1 5 o low set point o high set point Record oxygen pressure after loop flush psi bar Confirm Alternate Air So
207. plate while holding the counterlungs on your chest The DSV BOV assembly breathing hose holes should be level with your collar bones 16 Version 1 0 Prism 2 User Manual Proper fit is the first element in a rather complex dance with physics These few pointers should give you a good starting place in custom fitting the Hollis Prism 2 for best fit Don t be afraid to experiment with placement as the ultimate goal is diver comfort Once you have a fit that you feel will work for you in the water we need to examine how and where to distribute any weight you will require to get you the best in water stability possible Version 1 0 17 Prism 2 User Manual Stabilit by Gerard Newman What is stability Briefly it s the ability to choose and maintain your position in the water column When we have a stable platform for diving we are more comfortable in better control and better able to observe our underwater surroundings Diving with a CCR adds some additional considerations for stability Ideally we should be stable when swimming dynamic Stability and when hovering static stability We have better control over our stability when we assume prone horizontal trim in the water with our fins flat This increases our vertical drag helping to maintain our vertical position in the water column and decreases our horizontal drag as when swimming fig S1 Fig S1 Stability is affected by weighting and buoyancy Our weighting comp
208. properties over N 2 33X even at recreational depths the increased percentages of Argon in the breathing loop can become debilitating if left unchecked At deeper depths it can quickly reach dangerously narcotic pressures in the breathing loops Go deep enough and a just a few injections from the O tank can immediately incapacitate a diver Most mixed gas divers simply avoid this issue by planning well in advance of their expedition and have a purer grade O shipped in often at great expense 70 Version 1 0 Prism 2 User Manual How do you dive O of less than 100 with the Prism 2 First you will need to analyze the content of oxygen in the cylinder Make sure to adjust for temperature and humidity when setting up your analyzer so you get the most accurate reading you can This is especially important if you will be diving at deeper recreational depths Once you know the O content turn on your Secondary Display and navigate to your O setup menu The first sub menu item is Cal PPO The default is 0 98 Adjust the value to 2 1005 under whatever your O analyzer showed So if the O content came in at 0 96 set the Cal PPO to 0 94 This will build a buffer in to your decompression algorithms to account for any residual inert gasses left in the loop during a calibration loop flush When diving with any oxygen mix containing an inert gas you will need to purge the loop every so often to reduce the amount of inert gas that rides along
209. put one hand on the mouthpiece body to hold it in place and operate the mouthpiece barrel knob with the other hand pulling it down toward your chin Verify that it is sealed by blowing into the DSV You should see bubbles coming out of the purge orifice Eventually you may find you can shut down the valve with one hand but for now use two hands to make sure you do not accidentally pull the mouthpiece out of your mouth while it is still open Once you have verified the valve is sealed re open the mouthpiece and resume normal breathing BOV Operation The bail out valve BOV operates in much the same way as the DSV but when you rotate the mouthpiece lever in a downward position you are closing the loop and switching it to open circuit mode The BOV works the same as the open up and shut down DSV but has the addition of a third position wherein the lever also pulls out and up to seal the breathing chamber Sealing the chamber prevents the BOV from free flowing either on the surface or underwater To complete shut down skill with the BOV simply shut down the BOV to open circuit mode take a breath or two in OC mode exhale the OC gas then open the valve and breathe from the loop Mouthpiece skills are habit drills and your old habits of spitting out your OC second stage may prove hard to break initially Your instructor will have you repeat DSV BOV shut down many times throughout your course DSV BOV shutdown wh
210. r you have satisfied yourself that your loop is thoroughly flushed with oxygen you can do a 2 point field linearity check by multiplying the readings in air from step 28 Turn on Secondary Display Check cell mV readings in air by 4 76 You should get a number that is within a few percentage points of the mV readings recorded here in pure O While this field test is not a true linearity test as it only compares 2 points both of which are at ambient pressure and cannot take the place of a true full range ambient hyperbaric linearity test it is easy to do and doesn t hurt the cell so why not do the math Poor loop flushes or O less than 100 purity will affect these comparisons adversely Cells which are not linear or are current limited must not be dived Field Notes Flush twice The electronics might catch an inadequate oxygen flush as the Millivolt readings from the O sensors in a loop which has not been fully flushed might be too low and the software would reject calibration Recording the pre and post O pressures is one tool in your kit of diagnostic clues when your electronics are rejecting calibration 32 LED primary display On and battery check Xreplaced amp Turn the Primary Display power on with a single press of the piezo switch on the back of the electronics stack on the head and verify that all three of the LEDs illuminate first green then red If all three lights continuously blink orange for 30 seco
211. rain all gas from the buoyancy system Allow the unit to soak for 20 minutes If a rinse tank is not available rinse the unit as best as you can with a hose Pay special attention to the core of the system head bucket bladder pneumatics Any items that will be removed for disinfecting in the following steps can be soaked separately in a bucket or other small container Turn off O and drain lines remove tank Turn off the O tank valve Depress the manual O addition valve until the pneumatics are fully drained Unscrew the O first stage loosen the tank straps remove the tank Make sure to put the cover on the first stage DIN fitting Turn off diluent and drain lines remove tank Turn off the diluent tank valve Depress the ADV until the diluent pneumatics are fully drained The diluent first stage loosen the tank straps remove the tank Make sure to put the cover on the first stage DIN fitting Detach Bucket from head record absorbent usage or discard absorbent material Stored for re use O Discarded 0O Date packed Size Total hours used It is extremely important that any absorbent that is not immediately thrown out is stored shortly after removal in an airtight container This will insure that the moisture in the absorbent pellets necessary to maintain the chemical reactions that scrub CO does not evaporate Version 1 0 141 Prism 2 User Manual It is also extremely important that you track the
212. readily Carder Comte Ara runari with Comte with comet of Gabon Nadr iml cect Iph oes te sas my br i wien comiect m Haaar Dec ee Tee fos of ndum uarie aken mEt Dome bevel Age be eed roe deco of Voi 11 Toxicological Information Ho tariy date avadahir inredd wc Tiit of component Of CONTIDOPIERNIX pc 12 Ecological mformation expected Canes Hr maturallv material Do not dizcharpe inm Akes rivers of sewer syste When bandied ieee NI iz wot likely to pore detrimental ip the ermemanmmem 13 Disposal Consideration Umeed amd oiled sada Ime can be drsposed rf commercial sollic warie simlar H wase in acconiance with local wage dipal 14 Transport Information Version 1 0 Prism 2 User Manual ieee NI 1x wi a danger pri and mary be sent air UN Nemes None Hara Ar None Packaeing moup krr danger Xi Phrase R41 of serum damape to 6S Sean 10 and skin IDmpermus Comgaoamemt deberes abel rek phras Scrum 4 weight Pirae 52 Beep aut at reach of chidren 576 In case if contact with eyes one m
213. rent GF but it is different in a couple of ways First the current GF generates stops rounded to the nearest 10 feet or 3 meters So a gradient of 40 may reflect a ceiling of 15 feet but the computer will show a rounded up 20 foot stop Fig 149 Fig 145 Fig 146 Fig 147 Fig 148 Fig 149 Version 1 0 Prism 2 User Manual This number can be used in several ways First it can be used to calculate an aggressive ascent that still has some justification in decompression science For example if a diver were to lose a significant portion of their gas and needed to get shallow fast they could ascend until they reached a gradient of 90 then stop until it dropped to 80 then ascend to 90 again etc That would produce a Buhlmann like profile with very little conservatism In an emergency that may be an acceptable risk Another use might be to do a slower ascent on a dive to sightsee but to stay in the decom pression zone by keeping the gradient above 0 Another use would be to observe the rapidly increasing gradient in the last 10 feet to the surface and slow that y ascent Pressure Graph Gradient Factors B 5 4 2 1 All of this is based on gradient theory that may be completely false There is significant disagreement in the decom pression research community about the nature and practice of decompres sion Any techniques described here should be considered experimental GF Lo generates firs
214. rify that the Shrader valve is clean of debris salt or corrosion If the QD fittings are becoming stiff or are built up with corrosion a 1 2 hour soak in white vinegar may remove the build up Fig 290 Warning It is important to understand that all of the LP oxygen supply hoses contain in line flow restrictors and must never get exposed to salt water Never replace an O side low or high pressure hose with anything other than the correct Hollis part 106 Version 1 0 Prism 2 User Manual d HP High Pressure hoses and connectors W Check each HP hose leading from the first stages for signs of wear Replace as necessary only with Hollis approved parts lf any other gas supply hoses are attached to diluent first stage such as a dry suit hose or second stage check them for signs of wear Replace as needed d diver installed gas supply hoses if present W If you have installed any after market gas supply hoses on either the diluent or O first stages check them for wear pressure gauges W Look at both pressure gauges and verify that the needle is resting at psi 0 bar If it is not have the pressure gauge repaired or replaced Unless there are obvious signs of impact damage to the faulty gauge suspect water ingress through the first stage and have the rebreather gas supply system serviced by an authorized Hollis repair facility It is especially important for the Oxygen side of the system to remain free from c
215. rom flowing into the counterlung until the valve is depressed To service the valve remove both O rings and discard them Soak the valve body and seat in fresh water and then clean them with a clean dry lint free towel Remove all traces of old Tribolube Treat both replacement O rings with fresh Tribolube then place the first O ring into the O ring groove closest to the C clamp channel Then put the next O ring in place in the channel closest to the valve knob Replace the spring between the valve know and the valve body and insert the valve stem into the body being careful to insert it straight into the valve body Press the valve knob all the way into the body until the stem protrudes into the underside of the valve body and you can fully access the C clamp channel Rest the C clamp on the valve body next to the valve stem and raise or lower the stem until the C clamp channel lines up with the C clamp Using a small flat headed screwdriver push the C clamp into the channel until it is fully seated in the channel To test the valve connect the oxygen LP hose to the valve and charge the lines with oxygen Place the valve in a large glass of fresh water and check for leaks Finally depress the valve and check that the actuation feels smooth and gas flows freely when the valve is pressed 178 Version 1 0 Prism 2 User Manual Re install the valve onto the exhalation counterlung making sure to put the gasket between the fitting and valve The
216. rom the hose Place the hose and elbow in a bucket of Steramine and run the bottle brush back and forth through the hose several times Remove the hose and set it aside to dry Using the toothbrush clean the inside of the elbow then set it aside to dry as well The mushroom valve and valve seat are delicate parts and should be cleaned with care Remove the O ring on the outside edge of the valve body and set it aside Using a soft sponge soaked with Steramine gently wipe down the topside of the mushroom valve and then gently lift the valve off the valve seat and wipe down the underside of the valve as well as the valve seat Clean the O ring groove and set aside the valve body to dry Clean the O ring you had set aside treat it with Tribolube and reinstall it in its grove There is no need to sterilize the counterweight but if you like keeping your gear shiny and looking new you can soak it in water then wipe it down with a clean dry cloth to restore its shine Once the parts are dry you can re assemble the hose and fittings Make sure that you put 2 clamps back in each hose fitting with the clamp openings 180 degrees opposed from each other Test the valve operation by attempting to gently inhale You should see the mushroom valve firmly seat itself against the valve body but not be able to pull any air through If the valve does not seal the assembly must be replaced DSV BOV Exhalation hose amp fittings Tools needed Oeteker clamp
217. s Get in the habit of checking off each item on the checklist as you go and DO NOT skip around on the list Good checklist habits are the best way to insure that you have assembled your Prism 2 correctly and have not left out a critical step Version 1 0 Prism 2 User Manual As you can see from the preceding checklist it is broken down into 3 main setup sections Prism 2 Component Inspection Prism 2 Assembly Order and Prism 2 Operational Checklist The fourth sub section of the operational checklist Immediate pre dive checks amp system settings are for final systems verifications prior to entering the water You can use the 3 main sections individually as follows Prism 2 Component Inspection This section of the checklist is used to help you verify that all parts of a complete Prism 2 are present and visually undamaged prior to packing it for transport There is nothing worse than boarding a local dive boat or landing in a foreign country just to find out that you left your DSV BOV in your dive locker back home Prism 2 Assembly Order This is the list you will normally use to build your rebreather from component paris Prism 2 Operational checklist This is the section where you will test all assembled components of the rebreather to make sure they are functioning properly prior to entering the water You will complete these steps after assembly and between dives or if a piece of the functi
218. s This menu item doesn t appear during dives Each of the items in the System Setup menu can only be accessed on the surface All of the submenus contained within System Setup make use of a convenient user interface The MENU and SELECT buttons are context sensitive to each sub menu and individual setting Fig 185 When cycling through the sub menus MENU will carry the user to the next sub menu while SELECT will allow the user to edit the op tions in this submenu Once the user has pressed SELECT to edit a submenu MENU will cycle the user through the different submenu listings while SE LECT will let the user edit those listings Fig 186 Once the user has pressed SELECT to edit a submenu listing MENU will be used to change the context sensitive variable while the SELECT button will be used to move to the next field Once the user has pressed SELECT through all the fields the new user pref erences will be saved Fig 187 Dive Setup Fig 188 189 The first submenu is Dive Setup The options contained here are the same as those accessed from the Dive Setup section de scribed above except under System Setup all of the functionality is conveniently placed on one screen as opposed to the multiple screens seen is the above described Dive Setup menu For a description of the functionality of each option please see the above Dive Setup section Conservatism The final setting in the Dive Setup Submenu con
219. s When switching to open circuit while diving the most appropriate open circuit gas will become the breathing gas for calculations At this point the diver may want to switch to a different gas but since the diver may have other things to deal with the computer will make best guess of which gas the diver would choose There is also an option to set the computer to calculate decompression predictions using semi closed circuit This is enabled in the System Setup menu Fig 122 When switching the computer from CC mode to OC mode the computer will continue to maintain the active O setpoint You can manually adjust setpoint after switching the computer to OC mode to as low as 0 4ata O Dive Setup Fig 123 These screens are showing controller displays Pressing SELECT will enter the Dive Setup sub menu Low Setpoint Fig 124 This item allows you to set the low setpoint value It will display the currently selected value Values from 0 4 to 1 5 are allowed A press of MENU will increment the setpoint Press the SELECT button when Edit Low SP is displayed and the edit display will be shown It is set at the lowest valid value for setpoint 0 4 Fig 125 Version 1 0 Prism 2 User Manual 9 Fig 120 Fig 121 Fig 122 5 Prism 2 User Manual Another press of MENU will increment it again Fig 126 Fig 126 lf SELECT is pushed the currently displayed setpoint will be select
220. s length check to ensure that the line is clear of all your equipment Let go of the SMB and allow the reel to unspool keeping slight tension on the reel so the line does not become tangled mess also known as a birds nest Watch your depth and do not allow the SMB to pull you towards the surface as it ascends It is very important to keep the reel and line in front of you at all times so you do not become entangled in it and get pulled to the surface You can use the SMB line to maintain your depth once it is on the surface and doing so will keep the SMB standing up in the water so it is easier to see from a boat or shore Reel the line in as you ascend and once on the surface you can re stow the SMB and reel as you make your way back to the shore or boat Field Notes Using a drysuit with a rebreather Except in the coldest environments where argon gas is used for dry suit inflation or when using a helium mix in the diluent most people simply plumb their dry suits into their on board diluent gas This is acceptable if you are doing short and shallow dives 1 hr or less 60ft or less without a lot of depth changes However if you will be doing longer and or deeper dives or dives with a lot of depth changes to properly manage and conserve bailout gas you should consider using a small dedicated dry suit inflation system Version 1 0 Prism 2 User Manual Skills and Drills Completion List Pre dive equipment check perc
221. sed damaged or dislodged during storage donning or getting in the water It is also a second pair of eyes which will help insure nothing was overlooked during your pre dive bubble check To do a proper buddy assisted bubble check enter the water with your buoyancy device fully inflated the DSV BOV in your mouth breathing from the loop Make sure you hold the DSV BOV securely in your mouth when getting in the water Warning If you are doing a giant stride entry the force of the gas the loop being displaced by the water against the counterlungs will want to push the DSV BOV out of your mouth Keep your palm firmly against the DSV BOV in your mouth until you settle comfortably in the water Field Notes Buoyant entry Whenever you first enter the water with a rebreather your buoyancy device should always be fully inflated because should the rebreather experience a catastrophic flood on entry the entire breathing loop fills with water you would quickly become negatively buoyant Without the buoyancy device inflated to offset that buoyancy loss you could immediately begin to sink below the surface Surf entries on rebreather might be a situation where you would want to enter the water breathing on the loop with the buoyancy device deflated so you can dive under the incoming waves Once you are past the surf zone fully inflate the buoyancy system and begin your buddy checks You and your instructor will discuss entry options
222. servatism is not found under the above Dive Setup section The Secondary Dis play implements Gradient Factors by using levels of conservatism For a more detailed explanation of their meaning please refer to Kevin Watt s article on page 40 and Erik Baker s excellent articles Clearing Up The Confusion About Deep Stops and Understanding Fig 184 Fig 185 Fig 186 Fig 187 Fig 188 Fig 189 Version 1 0 Prism 2 User Manual M values The articles are readily avaiable on the web You might also want to search for Gradient Factors on the web OC Gases Fig 190 The second submenu is OC Gases This menu allows the user to edit the open circuit gases The options contained here are the same as those in the Define Gases subsection of the Dive Setup section contained earlier in this manual The interface conveniently displays all five gases simultaneously Fig 190 For a description of how to appropriately set each gas please see the above Define Gas section CC Gases Fig 191 The third submenu is CC Gases This menu allows the user to edit the closed circuit gases The options contained here are the same as those in the Define Gases subsection of the Dive Setup sec Fig 191 tion contained earlier in this manual The interface conveniently displays all five gases simultaneously For a description of how to appropriately set each gas please see the above Define Gas
223. set point other than is programmed into the on board computer if you find that the PO is too high and wish to quickly bring it down or if you simply wish to add gas volume to the loop to match your breathing volume To manually activate the valve simply depress the body of the valve inward toward the strike plate until you hear gas entering the loop You can control how much gas enters the loop by using short bursts of gas until the desired effect is achieved If you are attempting to reduce the PO of your loop add a small amount of diluent breath normally for approximately 5 breaths while watching the readouts of the 3 oxygen sensors on your secondary display Continue to add diluent and repeat the breathing cycle until the desired PO has been reached or the desired gas volume is achieved 152 Version 1 0 Prism 2 User Manual Field Notes Gas physics and the Diluent addition valve Remember as you descend in the water column the partial pressure of oxygen in your loop will increase as overall volume decreases so the addition of diluent is critical at this stage Your instructor will teach you and you must understand completely the gas physics of ascent and descent before you enter the water Skill 8 Manual addition of oxygen The Oxygen manual addition valve is located on the inside bottom of the right exhale counterlung facing the left counterlung It is a manual only addition valve To increase the PO in your loop
224. ssembly is firmly in place Fig 319 20 Attach gas supply hoses to diluent and oxygen addition valves on counterlungs amp BCD inflator 2 steps a longer diluent hose feeds BCD Pull both diluent hoses up BCD inflator hose and ADV hose and measure them against each other The longer hose feeds the BCD inflator 120 Version 1 0 Prism 2 User Manual b attach all 3 QD fittings Pull on hoses to make sure they are secure Each counterlung will have one supply hose which needs to be firmly attached to its corresponding gas addition valve Verify you are attaching the correct supply hose to its valve on the counterlung then pull up on the locking sleeve insert the female quick disconnect attachment onto the male nib and release the sleeve Pull on the hose to verify that the hose is securely connected Connect the longer diluent hose to the BCD inflator 21 Assemble DSV BOV and hoses check and install 6 steps In steps 5 amp 6 of the pre assembly checks you verified the operation of the three main sub assemblies that make up the DSV BOV assembly Now you will put together the assembly check its operation and install the assembly on the counterlungs a open close purge mouthpiece Open and close the DSV BOV shut down lever to make sure it is not binding or was damaged during transit With the DSV in the closed position blow into the closed mouthpiece to make sure the water purge hole is not obstructed b check mushroom
225. ssure oxygen lf any part of the oxygen clean system comes into contact with contaminants or is accidentally flooded with any substance including fresh water you MUST have the entire high pressure oxygen system serviced by an authorized Prism 2 service professional prior to use Failure to do SO can cause fire or explosion and lead to serious injury or death T Version 1 0 Prism 2 User Manual WARNING A N Design and Testing The Hollis Prism 2 has been designed and tested both in materials and function to operate safely and consistently under a wide range of diving environments You must not alter add remove or re shape any functional item of the Hollis Prism 2 or substitute any part of the Hollis Prism 2 with third party items that have not been tested and approved by Hollis for use with the Prism 2 This includes but is not limited to hoses breathing assemblies electronics pneumatics assemblies and their constituent parts sealing rings valves and their constituent parts and sealing surfaces latches buoyancy devices inflation and deflation mechanisms and on board alternate breathing devices Altering adding removing re shaping or substituting any part of the Hollis Prism 2 with non approved parts can adversely alter the breathing gas delivery or CO absorption characteristics of the Hollis Prism 2 and may create a very unpredictable and dangerous breathing device possibly leading to serious injury or death Non
226. sture pad 1 Check that you have a bucket moisture pad installed at the bottom of the bucket The moisture pad should be capable of absorbing the majority of condensation moisture that collects along the bucket wall dripping to the bottom of the bucket during use Warning bYou must use only Hollis approved bucket moisture pads Never use moisture pad that can interfere with the compression spring and clearances of the scrubber basket Using moisture pads that were not designed for the Hollis Prism 2 could damage the basket bucket spring bucket latches Red CO2 Seal or latch seat A failure in any of these areas during diving operations could lead to serious injury or death Version 1 0 115 Prism 2 User Manual 12 Basket assembly W 4 steps The basket assembly comes in four basic parts Fig 312 the basket the basket lid the center tube and the center tube O ring The basket assembly utilizes a strong nylon mesh to avoid rips and is also somewhat elastic so it will not create dust by abrading the absorbent along its walls during packing transit or handling The nylon mesh is also thermally non conductive which helps keep the absorbent material and its absorbing capacity as thermally efficient as possible Fig 312 a check mesh W Look at the mesh of both the basket and the center tube There must not be obvious tears or abrasions of the mesh Do not attempt to repair a basket with torn or abraded mesh as a
227. t button twice to calibrate Depress the select button twice to calibrate Once the Secondary Display accepts calibration all 3 PO display values will match with the Cal PPO value programmed into the computer during system setup see Cal PPO2 programming on page 69 The system default is 0 98 PO Record mV readings in O 1 2 3 acceptable range 40 6mV to 66 9mV We want to record the millivolt readings so we can monitor the health of the O sensors over Time As the cells age the current output in both air and pure O will decrease to a point where they can become unstable and unpredictable Usually the cells will exceed their Use by date and need to be retired before they become a problem but occasionally you may get a cell which goes bad during its service life which is printed right on the cells label for your safety Recording these mV readings will allow you to better track cell behavior Also recording the mV values in oxygen and comparing those values with previous values can 130 Version 1 0 Prism 2 User Manual give us a good indicator if we have done a thorough flush of the loop For instance if the last time you calibrated the system the mV values were 55 but a week later they are outputting 45 mV post flush you may want to consider flushing more oxygen through the loop to see if those mV values increase as you add more O which would indicate an incomplete loop flush Finally afte
228. t stop M value sradient surface Pressure linear function but the concepts may be useful to the for gradual advanced diver change in Gradient Factors Compartment Inert Gas Pressure absolute sr Hi surfacing value maintains safety margin Ambient Pressure absolute x The last selection is 5 This feature has been borrowed from Dan Wible s CCR2000 computer It is the time to surface TTS if you were to stay at the current depth for five more minutes This can be used as a measure of how much you are on gassing or off gassing Fig 150 Fig 150 Version 1 0 61 Prism 2 User Manual 62 External PPO Monitoring The next menu item is used to turn external PPO monitoring on and off Fig 151 By default external monitoring is turned on and reads Ext for External To turn external monitoring off Int press the MENU button to change from External to Internal then press the SELECT button on this menu item Now the PPO of the three sensors is displayed In the displayed screens we have three sensors and they have been calibrated at some point Fig 152 This system is plugged into three sensors and is the primary display for the system Fig 153 Note that since we are in Closed Circuit mode that the PPO used to calculate decompression is the average of the three sensors after voting In this case sensor three has been voted out and the decompression calculation will use th
229. t to perform the test Make a mental note of either the mV readings or the PO readings on the secondary display prior to starting the test If the negative pressure in the loop during this test is strong enough you will notice that the readings drop a point or two and will remain at those values as long as there are no leaks in the loop If the readings do not drop at all it is possible that you cannot create enough of a vacuum to drop the values or you have a leak in the system that will not allow a vacuum to form at all We do the negative pressure test at this stage of the checklist because we are also preparing the loop for an oxygen flush which we will begin doing during the positive pressure test Performing the negative pressure test now removes as much inert gasses from the loop as possible Version 1 0 127 Prism 2 User Manual a open DSV BOV Open the DSV BOV and press on both counterlungs Fig 339 to remove as much gas as possible from the counterlungs b inhale from DSV BOV in CC mode exhaling through nose until counterlungs fully collapsed Now place the open DSV BOV in your mouth and while inhaling from your mouth and exhaling through your nose get as much gas as possible out of the loop Continue until the counterlungs have fully collapsed and you cannot pull any more air out of the loop leaving a slight vacuum in the loop or negative pressure c close DSV BOV With the loop drained of as much gas as possible
230. tarted with the 19 setpoint selected Fig 161 Version 1 0 Prism 2 User Manual Fig 158 Fig 159 Fig 160 Fig 161 63 Prism 2 User Manual 64 Dive Log Menu Display Log At the Dive Log prompt press SELECT to view the most recent dive Fig 162 163 The profile of the dive is plotted in blue with decompression stops plotted in red The following information is displayed Fig 164 Maximum and Average depth Dive number Date mm dd yy and time 24 hr clock of dive start Length of dive in minutes Press MENU to see the next dive or SELECT to quit viewing logs Upload Log See Firmware Upload and Dive Log Download Instructions Edit Log Number Fig 165 The dive log number can be edited This is useful if you need to clear the dive log but want the numbering to continue from where you left off At the Edit Log Number prompt press SELECT to begin editing While editing use MENU to change the value of the currently underlined digit and SELECT to move to the next digit Fig 166 The next dive number will be 1 from the value entered here For example if you enter 0015 then the next dive will be dive number 16 Clear Log Fig 167 168 At the Clear Log prompt press SELECT You will be asked to SELECT again Press SELECT to begin clearing the log or press MENU to cancel It will take about 1 minute to clear the log Do not remove the batt
231. terlung is on right side bladder amp yoke facing up Verify that the inhale counterlung is on the right side by checking that the lung you are installing on the right has the ADV on the front The exhalation lung will go on the left side Version 1 0 119 Prism 2 User Manual b line up Velcro parts and compress Press the Velcro pieces together to assure a firm adhesion of the parts Fig 315 c clip fastex buckles in place Attach the plastic Fastex clips of the yoke to the counterlungs making sure gt Fig 315 they lock into place Fig 316 Attach the lower large fastex buckle on the waist belt webbing onto the Fastex buckle at the back of the counterlung Fig 318 and the side strap webbing attached to the backplate to the small Fastex clip at the lower side of the counterlung Fig 31 Fig 318 19 Install counterlung breathing hoses to head 2 steps a clean and lubricate O rings O ring groves and mating surfaces Remove clean and prepare the O ring s O ring grove and mating surface for use or replace if worn or damaged b install hose nuts finger tight Do not over tighten To properly attach the counterlung hoses to the head put the hose mount into the head connector Fig 319 and push down until firmly seated against the stainless steel ring on the fitting Hand tighten the nut but do not over tighten it as over tightening will only make removal more difficult Gently pull on the hose to insure that the a
232. the System Default or the secondary will not report the output of the O cells 32 Version 1 0 Prism 2 User Manual The full menu structure is below Turn Off e Calibrate Switch Setpoint e Select Gas e Switch Open Circuit Closed Circuit Open Circuit Semi Closed Circuit Dive Setup Edit Low Setpoint Edit High Setpoint Define Gases e Dive Planner e NDL Display e External PPO2 Monitoring Brightness Dive Log Display Log Upload Log e Edit Log Number Clear Log Setpoint gt 19 e System Setup Dive Setup OC Gases CC Gases O Setup Auto SP Switch Display Setup System Setup e Advanced Configuration Salinity Title Color OC Show PPO End Dive Delay CC Min PPO e CC Max PPO The Turn Off Calibrate Dive Log Setpoint gt 19 and System Setup menus are only available on the surface This is the menu during a dive Switch Setpoint e Select Gas e Switch Open Circuit Closed Circuit Open Circuit Semi Closed Circuit Version 1 0 33 Prism 2 User Manual Dive Setup e Edit Low Setpoint e Edit High Setpoint Define Gases e NDL Display Brightness The status screens are 34 Gases no decompression limit and time to surface Diluent PPO CNS and average PPO Oxygen sensor millivolts Maxdepth average depth average atmospheres e Water temperature current Gradient Factor current fixed Oxygen e GF99 decompression ceiling time to surface in 5 minutes an
233. the centerline of 1 0 PO Fig 36 PO Color Flash 5 Sec 0 95 1 05 Accept Cal oolid 5 Sec Once after calibration Lost Signal Continious LEDs Check Once only Battery Low Solid 30 sec Once at turn on Flash 5 Sec 6 6 Solid 5 _ Continious only Solid 30 sec Fig 36 LEDs check at turn on When you first turn on the Primary Display the green and red LEDs will each flash once This is a test to insure that all LEDs are working correctly Once this test has competed the system will check the battery voltage and if it is low will flash a battery warning see Low battery warning If the battery is operational the electronics will begin displaying the appropriate cell information N OFF BRAND DISCOUNT BATTERIES ARE ACCEPTABLE TO POWER TOYS AND FLASHLIGHTS BUT HAVE NO PLACE IN LIFE SUPPORT GEAR AND MUST NEVER BE USED TO POWER ANY COMPONENT OF YOUR PRISM 2 Refer to full battery warnings on page V WARNING USE ONLY NAME BRAND BATTERIES DURACELL EVEREADY etc 28 Version 1 0 Prism 2 User Manual Low Battery Warning The Primary Display is powered by a SAFT 3 6V AA battery mounted in the battery compartment in the head After the LED check the Primary Display it will check its battery state If the battery charge is low the display will flash all three LEDs orange combined red and green for 30 seconds Fig 37 and then go into operational
234. tifies whether the water is too hot or too cold and by how much After measuring the temperature and then calculating the error the controller decides when to change the tap position and by how much When the controller first turns the valve on it may turn the hot valve only slightly if warm water is desired or it may open the valve all the way if very hot water is desired This is an example of a simple proportional control In the event that hot water does not arrive quickly the controller may try to speed up the process by opening up the hot water valve more and more as time goes by This is an example of an integral control Making a change that is too large when the error is small is equivalent to a high gain controller and will lead to overshoot If the controller were to repeatedly make changes that were too large and repeatedly overshoot the target the output would oscillate around the setpoint in either a constant growing or decaying sinusoid If the oscillations increase with time then the system is unstable whereas if they decrease the system is stable If the oscillations remain at a constant magnitude the system is marginally stable 12 Version 1 0 Prism 2 User Manual In the interest of achieving a gradual convergence at the desired temperature the controller may wish to damp the anticipated future oscillations So in order to compensate for this effect the controller may elect to temper its adjustments This can be thought of
235. to inhale from the DSV BOV If either mushroom valve fails to seal dis assemble the DSV BOV assembly clean or replace the failing mushroom valves and re test e install DSV BOV onto counterlungs paying attention to flow direction arrow Take the inhalation side elbow and insert it into the counterlung at approximately an outward facing 45 angle away from the unit s center Fig 324 Both elbows are keyed Fig 325 so the DSV BOV assembly cannot be accidentally reversed If they are accidentally reversed and screwed down they will not lock in place and you will be able to spin them even when they are fully secured Screw the inhalation hose onto the inhalation counterlung left and tighten it down Do the same with the exhalation hose elbow installing it on the exhalation right counterlung Fig 324 Fig 325 Turn the DSV BOV until the mouthpiece is approximately 45 up facing in towards the rebreather Fig 326 This should be a good starting point for the mouthpiece angle but the angle should be set for the diver s preference You can continue to rotate the mouthpiece angle to find out what works best for you Field Notes Twisted breathing hoses When mounting and adjusting the DSV BOV on the hoses be very careful not to adjust the angle of the mouthpiece by twisting one of the hoses as this could cause the hoses to kink during diving If there is any doubt about hose twisting unscrew the counterweight from the DS V BOV and watch
236. ttle in the counterlung Place the bottle brush inside the hose and place the hose in the bucket of Steramine Move the brush in and out of the hose to scrub the interior Clean the hose attaching hardware as well Finally clean the attaching hardware O ring O ring grove and treat it with Tribolube Inhalation Counterlung amp Drain Tools needed Oeteker clamp pliers Large Bottle Brush Tribolube Steramine Clean dry cloth You may choose to remove the breathing hose or you can clean it as a piece with the counterlung Remove the ADV hardware from the counterlung by unscrewing the ADV threaded collar and set it aside Fill the counterlung with Steramine and thoroughly clean the inside with the bottle brush being sure to scrub all sides bottom and top Loosen the Counterlung drain locking collar and allow some Steramine to run through the drain hole Pour the Steramine out of the counterlung and re drain the counterlung drain If you removed the hose for cleaning reattach the hose using the Oeteker clamps and hang the counterlung to dry It is always recommended that if you hang the counterlungs to dry in an area where bugs can enter you stuff all the holes in the counterlungs using paper towels This will allow the interior of the lungs to dry while blocking bugs from getting in and making a home Automatic Diluent Addition Valve Tools needed Steramine toothbrush or sponge Schrader Valve tool Remove the plunger retaining nut and t
237. turn the computer on after a dive has started then the computer assumes the surface pressure is 1013 mBar If at altitude this could result in incorrect decompression calculations Fig 209 Flip Screen This function displays the contents of the screen upside down t allows the computer to be worn on the right arm Fig 210 Fig 209 Fig 210 Version 1 0 Prism 2 User Manual System Setup Date The first System Setup changeable option is Date which allows the user to set the current date The date will have to be re entered after a battery change Fig 211 Time The next System Setup changeable option is Time which allows the user to set the current time The time will have to be re entered after a battery change Fig 212 Load Upgrade The next System Setup changeable option is Load Upgrade which allows for the user download version upgrades The documentation on how to use the Load Upgrade option can Fig 213 be found in the above Firmware Upload and Dive Log Download Instructions Reset to Defaults The final System Setup option is Reset to Defaults This will reset Fig 214 all user changed options to factory settings and clear the tissues on the Secondary Display Reset to Defaults cannot be reversed Note This will not delete dive logs or reset dive log numbers Fig 215 Fig 216 Version 1 0 15 Prism 2 User
238. underneath making sure the top 2 bucket latches are centered and facing away from the backplate Open all 4 bucket latches and fold back the hooks so they do not get caught between the bucket and head Put your hand at the bottom of the bucket and push it up towards the head making sure not to twist or push at an angle When the bucket is close enough to the head that the latches can catch onto the mounting flange flip the two side latches onto the flange and lock them in place Verify that the latches are locked by attempting to pull up on the latches Then flip the two top latches into place and lock them down and verify they are locked Look at the two O rings through the clear bucket to verify that they are in their grooves and are not twisted Field Notes Can t breathe If you cant inhale from the loop once you seal the bucket on the head it s most likely because you installed the scrubber basket upside down in the bucket The bucket spring forces the flat basket top onto the Red CO2 Seal as a safety pre caution stopping gas flow around the loop 126 Version 1 0 Prism 2 User Manual Prism 2 Operational Checklist 27 Install analyzed and properly labeled gas cylinders Place the diluent tank under the two tank straps on the divers left Place the O tank on the divers right It is very important that you put the correct tank in the appropriate position Screw the DIN first stage into the valve and then do the same with th
239. urce Operation Check BC inflation air holding and deflation mechanisms Record diluent pressure psi bar Install weights Verify LED primary display is powered on Don unit secure fasteners tighten belts Verify oxygen and diluent valves on Secure secondary display on wrist Verify secondary display is on Verify loop contents are within user set limits on secondary display Pre breathe loop LI EI LI EL ET EI E ET E EJ ET ET EJ P1 ET ET P ET ET ET E ET ET EI FT ET EI F1 EI EJ FP E ET E E FT ET ET L1 EI LILI EI LI EI EI D1ET ET E Don t forget to do your bubble and cell limiting checks at 15ft 5m and have a Safe dive Version 1 4 Version 1 0 195 Prism 2 User Manual Prem Padine Lest 196 Version 1 0 Prism 2 User Manual Hardware Cover Mounting tube 4 X J H 1b X 17 w washers 2X NutharTube 2X 4 0 Lock 2 wing nut 2X0 S716 washer 145 16 18 X 125 kwer 1X5 15 18 X 1 5 upper Version 1 0 197 Prism 2 User Manual Pakre order the Prem Head w Elerirengs in priecne bax ness in HE Adapter Keeuk tors an the bottom Crumprnunrzs guide of the bor and bucket Cees mount bar DSV in remani Sees 198 Version 1 0 Prism 2 User Manual Version 1 0 199 Prism 2 User Manual PART SEVEN Material Safety Data Sheets and Product Sheets MSDSs DeoxlT Intersorb Steramine 1 Tablets The material Safety Data Sheets reprinted here are for product safety
240. usage of the absorbent pack so you do not accidentally over use the absorbent pack beyond its serviceable life Never use absorbent beyond its serviceable life Using absorbent beyond its serviceable life can lead to injury or death If you are ever in doubt throw out the absorbent and re pack with fresh material Your life is worth far more than the cost of 6lbs 2 7kg of absorbent Disinfect bucket If you are using Steramine or other dissolving disinfectants the scrubber bucket is a great vessel to mix up 1 gallon 3 78L of disinfectant and soak the breathing hoses DSV BOV and moisture pad then pour the remaining disinfectant into the counterlungs to disinfect them For 1 gallon 3 78L fill the bucket to 34 19mm below the latch strap After using the disinfectant either dry the bucket with a clean dry towel or turn the bucket over and allow it to drip dry Inspect O sensors record readings in air Sensor 1 Sensor 2 Sensor 3 After settling in air for a few moments each O sensor should read 0 21ata O Record the readings in either mV or atmospheres of O whichever you feel is more relevant to your record keeping Acceptable millivolt range for a sensor in air is 10mV 3mV 142 Disassemble mouthpiece to counterlung hose assembly disinfect hang to dry Disassemble the sub assembly open the DSV BOV shut down valve and let soak in the disinfectant Stretch each hose and a
241. uthpiece If required cut the mouthpiece retaining strap using the dykes If you cannot find dikes and must use a knife or scissors use extreme caution to protect yourself from cuts Remove the mouthpiece and insert the hex wrench into the knob retaining screw and turn the hex wrench counter clockwise to loosen the screw Once removed set the screw aside and pull the knob off the barrel There is a small O ring sealing the knob to the barrel Locate it and set it aside along with the knob Insert both thumbs into the exhale side of the DSV body and push on the stainless steel barrel until it comes out of the body There are 3 O rings on the barrel One on each side of the barrel and one rectangular O ring around the opening for the mouthpiece Don t look in your spares kit for a rectangular O ring You won t find one While the channel it sits in is rectangular the replacement O ring is round and takes a rectangular shape only after it has been in place for a while Remove the three O rings and set them aside Clean the barrel and the sleeve in Steramine making sure to remove old lubricant from their surfaces and channels Set them aside to dry Take the O rings and clean off old lubricant and check them for wear If they are in good shape lubricate them with Tribolube and put the O rings back in their grooves You may need to coax the square O ring back into its groove You may need to hold it in place until the barrel is back in the sle
242. valve seals and flow direction Look at the top of the DSV BOV The arrow denotes the gas flow direction Fig 320 and points at the exhalation mushroom valve Fig 321 Make sure the mushroom valve is intact and in good condition and the seat is firmly seated in the DSV BOV assembly c install hoses onto DSV BOV Take the inhalation hose mushroom valve installed in the counterweight side of the hose on DSV hose Fig 322 and screw the nickel plated brass counterweight onto the inhalation side of the DSV BOV the flow direction arrow on the DSV BOV points away from the inhalation side Leave the counterweighted nut slightly loose until you adjust the mouthpiece angle after you have mounted the assembly onto the counterlungs Fig 322 Take the exhalation hose and screw the nickel plated brass counterweight onto the DSV BOV exhalation side Leave this nut slightly loose as well Version 1 0 121 Prism 2 User Manual d perform a mushroom valve sealing test stereo check To test that the assembly will flow gas in one direction only open the DSV BOV and place the mouthpiece in your mouth To check the inhalation mushroom valve seal the exhale hose elbow on your right cheek and put the inhale hose elbow by your left ear and blow gently into the DSV BOV You should not be able to exhale or hear any air escaping from the inhale side To check the exhale mushroom valve reverse the elbows left on cheek right at ear and attempt
243. valve seat is keyed to insure that the valve does not rotate in the fitting so once you have started to thread the valve retaining nut onto the mounting flange rotate the valve so the QD fitting faces up toward the breathing hoses Scrubber Bucket amp basket spring The scrubber bucket does not need cleaning beyond rinsing with fresh water and if absorbent material builds up on the clear urethane a wipe with pure vinegar and fresh water rinse The Stainless Steel band and 4 Nielson Sessions latches should remain free of rust as long as it is soaked in fresh water after use There is no need to use any lubricants on the latches and it is recommended that you do not do so as the lubricants can travel and get onto O clean parts The Stainless Steel band is held in place using surface pressure applied by tightening the band using the two nuts and bolts on the band Check that both nuts are tight and the band is firmly in place The scrubber basket retaining piece and pressure spring are held onto the spring assembly retaining stem with a stainless steel nylon locking nut and washer The spring assembly retaining stem is molded into the Urethane bucket Neither part requires maintenance beyond normal cleaning with fresh water and checking that the locking nut is firmly in place Scrubber basket Tools needed White Vinegar stiff toothbrush The scrubber basket requires cleaning after each use Depending on the CO2 absorbent used the basket
244. valves amp drain hoses turn off electronics and secure unit Warning Have you ever jumped in the water while diving an open circuit system only o find out you forgot to turn your air on It s a pretty obvious oversight the moment you try to inhale gas If you do that on a closed circuit rig with your O tank the consequences may be delayed you can still breathe on the loop but may be fatal Always verify that your gas supply cylinders are turned on prior to entering the water Immediate pre dive checks Name Date Verify dive plan with buddy Install weights 3 steps counterlung o BCD trim weights Verify LED primary display is powered Don unit secure fasteners tighten straps Verify oxygen and diluent valves on 3 steps O diluent valve check O oxygen valve check activate manual gas addition valves while watching SPGs Secure secondary display on wrist Verify secondary display is powered on Switch active setpoint to Low Setpoint gt 4 Verify loop contents are within user set limits on secondary display Pre Breathe Checklist O check ADV operation automatic and manual solenoid oxygen addition manual oxygen addition BCD inflation deflation verify SPG s oxygen diluent open circuit bailout supplies observe setpoint maintained within user set limits on Primary and Secondary Displays L D DE Don t forget to do your in water bubble checks and have a safe dive Field Note
245. ver you set up your Prism 2 for diving operations Version 1 0 91 Prism 2 User Manual 92 Prism 2 Component Inspection Step by step descriptions are located in the user manual Check H Plate harness BC for wear damage or missing parts 7 steps o H plate harness W fabric W inflator alt air source KEY o dump valve s W T p 1 removable weight pockets W 1 E Aen O fastening clips W Inspect counterlungs 7 steps fabric W drains O threaded DSV BOV assembly rings W breathing hoses Oetiker clamps amp o rings W O addition valve 1 automatic diluent addition valve ADV O valve OPV O Inspect DSV BOV breathing hoses 4 steps el EE O hoses O Oetiker clamps W LH o rings W inhalation hose mushroom valve only on inhale hose for DSV supplied systems W Inspect DSV BOV 4 steps shut down OC assembly D water drain 1 mouthpiece zip tie DSV BOV exhalation mushroom valve W inhalation hose mushroom valve only on inhale side of BOV W Inspect regulators and hoses 6 steps o 1st stages W pressure relief valves LP hoses amp connectors W HP hoses amp connectors W diver installed gas supply hoses if installed O pressure gauges Inspect wiring 2 steps O LED primary display W D secondary display W Battery compartment batteries amp o rings 4 steps o soleno
246. wiring harness clean connections All cells 1 Check mV readings in air and pure O are within range 2 Check wiring harness clean connections No cell output reported 1 Switch wiring lead from missing cell to active cell 2 Clean molex connectors 3 Change wiring harness Version 1 0 181 Prism 2 User Manual Solenoid Solenoid will not fire All parts must be handled as O clean 1 Check for solenoid alert on Secondary Display 2 Check solenoid battery voltage on Secondary Display 3 Check battery quality output limited Use name brand batteries only Solenoid doesn t appear to inject O All parts must be handled as O clean 1 Pressure drop test 2 Temporarily remove in line restrictors re test Solenoid is stuck open All parts must be handled as O clean 1 Bring to Hollis service immediately do not attempt field repair Solenoid adds gas very slowly All parts must be handled as O clean 1 Check for clogged restrictors 2 Check for clogged first stage filter 3 Check O first stage IP Oxygen Pneumatics Manual O addition valve is free flowing All parts must be handled as O clean 1 Replace O rings 2 Check Valve body for cracks 3 Check O2 first stage IP Manual O addition is very slow All parts must be handled as O clean 1 Check for clogged restrictors 2 Check for clogged first stage filter 3 Check O first stage IP Diluent Pneumatics ADV is freeflowing 1 Check Schrader valve 2 Check p
247. with every oxygen injection into the loop It is especially important to purge the loop regularly when that inert gas has increased narcotic properties and decompression issues Remember the lower the percentage of oxygen in PSA separated O the higher the percentage of argon You will also want to account for any added decompression obligations incurred from breathing a heavier inert gas during diving Because there are no tables we know of that specifically address this issue argon is not considered a breathable inert gas for recreational depth and times you may want to err on the side of caution and extend your safety stop Field Notes Adsorbent Don t you mean absorbent Adsorption Definition The adhesion of a chemical species onto the surface of particles Adsorption is a different process from absorption in which a substance diffuses into a liquid or solid to form a solution So why do we call CO sequestration in soda lime an absorption Version 1 0 71 Prism 2 User Manual 72 Solenoid Speed Fig 195 The firing pattern of the solenoid can be changed between fast and slow on controllers The FAST setting adjusts the PID controller s algorithm to use frequent short injections of oxygen and is generally more accurate The SLOW setting is more familiar to many users as it tends to mimic non PID controlled solenoids Fig 196 Set SC Identity Fig 197 198 199 This function is used to switch b
248. ws yellow after the battery is less than 3 28V for 30 seconds Below 3 15V the battery indicator will flash red You will need to change your battery immediately It is recommended to change your battery when the battery indicator steadily glows yellow The ascent rate indicator shows 6 levels of ascent rate Each block represents either 10 fom or 3 mpm 1 2 3 bars will be green 4 and 5 bars will be yellow 6 bars will be red When the ascent rate is greater than 6 bars the whole block will be filled in red and it will flash If you are above the indicated stop depth the stop depth will flash red The second data line shows the three O sensor readings Fig 38 sensor is voted out it will display the current value but it will flash yellow and the value will not be considered in the average PPO This area will also display fixed PPO Fig 38 The next area is the title for the bottom line This title changes frequently in the menu system to provide additional information about the bottom line The last line shows that the computer is in closed circuit CC mode with a gas containing 21 oxygen and 0 helium If there is a gas programmed in the current mode OC or CC that would normally be used at the current depth the system will flash the gas contents in red to remind you to either switch gases or remove the gas if you aren t using it In addition there is a context sensitive area at the bottom which is implemented
249. y Make sure that you and your buddy have gone over the dive plan and you are both clear on the stated objectives of the dive and any emergency or contingent planning or considerations that should be discussed prior to entering the water 44 Install weights 3 steps After some trial and error you will figure out how much weight you will need to safely dive the Prism 2 How you choose to distribute that weight is mostly a comfort issue based on your physical build The Prism 2 has weight pockets sewn into the back of each counterlung and waist dump pockets on the factory supplied buoyancy compensator and several locations to mount trim weights The only hard and fast rule regarding weight distribution is that the majority of the weight must be easily ditch able in the event of a catastrophic loop flood on the surface or any event requiring an emergency buoyant ascent from depth a counterlung Each counterlung can hold up to 5 pounds of either hard or soft lead How much lead you use is up to you but most people report that 3 or 4 pounds is sufficient to offset counterlung buoyancy Some Prism 2 divers prefer not to add weight to the counterlungs Again weight distribution is mostly a comfort issue What works for one person may not work for another b buoyancy compensator The detachable weight pockets can hold up to 10 pounds each of hard or soft weight c trim weights Depending on your system configuration you may have various trim
250. y check OK replaced amp OK Calibrate LED Primary Display presses within 1 second LED Primary Display piezo power switch 1 Record oxygen pressure after loop flush psi bar Solenoid check O setpoint to high gt 1 0 1 solenoid fires and oxygen injection is verified change active setpoint to 19 1 Solenoid Batteries check 6X select OK replaced amp OK Secondary Display battery check OK replaced amp OK 1 Adjust user selected low high set points to desired settings 0 4 1 5 4 steps O menu to dive setup O menu to edit low setpoint adjust as needed low set point O menu to edit high setpoint adjust as needed high set point Diluent system leak test 2 steps Hold for 30 seconds minimum Oo open diluent cylinder charge lines turn off diluent tank valve D watch gauge for pressure drop O Confirm alternate air source operation if supplied Flush loop ADV test 3 steps O open diluent cylinder inhale from on board alternate air source if supplied O open DSV BOV inhale from loop until ADV engages drop loop Check buoyancy compensator inflation air holding and deflation mechanisms O Record diluent pressure Version 1 0 95 Prism 2 User Manual 96 Oo EX EI E31 If diving immediately continue with Immediate pre dive checks checklist If NOT diving immediately Close and diluent cylinder
251. y dangerous levels of carbon dioxide CO within the breathing loop The Hollis Prism 2 utilizes a user packed radial design CO scrubber Only Hollis tested and approved CO absorbents should be used and factory stated maximum scrubber durations must never be exceeded Exceeding factory stated scrubber durations for a particular material will eventually lead to serious injury or death It is entirely possible that for any number of reasons including but not limited to channeling ambient temperature exhausted damaged inappropriately stored or for whatever reason inert scrubber material the chemical and thermodynamic reaction required to sequester gaseous CO will not occur as expected and a toxic and possibly fatal level of gaseous CO within the breathing loop can result You must carefully follow all instructor and manufacturer recommendations for use and handling of CO absorbent never use a CO absorbent if you cannot verify that it is able to sustain CO absorption and carefully pack the radial scrubber and complete a system pre breathe prior to each immersion as you were taught in your training course Further you must carefully monitor yourself for any symptoms of possible CO poisoning whenever you are breathing from the Hollis Prism 2 and bail out to open circuit should any physical or mental symptom lead you to suspect elevated CO levels in your breathing loop Failure to bailout at the first sign of trouble can lead
252. y does show readings for the O cells and the battery display shows charged batteries it may be that water has gotten into the oxygen pneumatics or the solenoid has simply failed Have the unit serviced by an authorized Hollis service center Never dive your Prism 2 with a failed solenoid 9 Inspect head assembly 3 steps a Red CO Seal 1 W The Red CO Seal is a thick spongy feeling red gasket that resides on the underside of the head in a channel on the face of the exhaust plenum adjacent to the three O sensors Fig 299 DO NOT LUBRICATE THE Red CO Seal The Red CO Seal MUST be checked now and prior to sealing the bucket to the head The Red CO Seal is a critical component of a properly functioning breathing loop If the gasket were left out during operation Fig 300 you would have 100 CO breakthrough possibly leading to injury or death WARNING You must verify that the Red CO Seal is in place seated properly in its groove and is clean and undamaged anytime you load the CO scrubber basket into the unit Failure to check the Red CO Seal may lead to serious injury or death b head to bucket O rings 2 W 1 The head to bucket sealing flange Fig 301 incorporates two bucket sealing O rings Fig 302 You must check and clean both O rings and their seating surfaces whenever the bucket has been removed from the seating flange Version 1 0 111 Prism 2 User Manual To begin the cleaning process using t
253. y reason the LED corresponding to the lost signal will oscillate green red continiously until signal output is restored Some of the more common conditions which could cause this would be broken or shorted wiring in the cell or wiring harness or a completely dead aged cell An operating cell which has gotten its permeable membrane wet will rarely lose signal completely Field Notes Bi Colored LEDs Bi color LEDs are actually two different LEDs in one case They consist of two dies connected to the same two leads antiparallel to each other Current flow in one direction emits one color and current in the opposite direction emits the other color Alternating the two colors with sufficient frequency causes the appearance of a blended third color For example a red green LED operated in this fashion will color blend to emit a yellow or orange appearance Version 1 0 29 Prism 2 User Manual Secondary Display The display has five areas There are three title areas and three data display areas Fig 37 Across the top line is the title for the first row of information This area only changes during the display of the dive log The first data Fig 37 area shows depth battery warning dive time ascent rate first stop depth and first stop time Fig 37 is showing a depth of 34 7 meters a low battery alarm 15 minute dive time a 3 meter per minute ascent rate and a stop at 24 meters for 1 minute The low battery indicator glo
254. your mouth Turn the mouthpiece up for 1 or 2 seconds and then put the mouthpiece back in your mouth and exhale forcefully to move the water from the valve chamber past the exhalation valve into the exhalation hose There are two methods to clear the exhale hose of water Lean slightly to your right and allow the water to drain into your exhalation counterlung The directional mushroom valves inside the DSV will block the water from entering the inhalation side of the loop so it can only go to the exhalation side You can also close the mouthpiece lift the hose assembly above your head and allow the water to drain into the exhalation counterlung Remember to blow tiny bubbles whenever the mouthpiece is out of your mouth 158 Version 1 0 Prism 2 User Manual Each of your counterlungs has a drain valve located on the bottom of the counterlung On the end of the drain valve you have a silver twist lock which should be closed for diving Fully loosen the lock mechanism During your exhale cycle push the drain nib back towards the valve body This will open the drain and allow the liquid inside the counterlung to vent out You only open the valve during exhale so the back pressure inside the counterlung helps force the fluid out Let go of the nib during your inhale cycle Repeat the process until you see a stream of bubbles exit through the drain valve Draining the counterlung can be a very slow process It may take a minute to fully drain the c

Warning

Contents

Download Pdf Manuals

Related Search

Related Contents