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Displays And Electronics user Manual

1. 2 MENU REFERENCES TURN OFF The Turn Off item puts the computer to sleep Fig 2 78 This menu item will only appear if the water contacts are dry While sleeping the screen is blank but the tissue contents are maintained for repetitive diving The Turn Off menu item will not appear during a dive Fig 2 78 CALIBRATE This will calibrate the sensor displays to oxygen Flood the breathing loop with pure oxygen SELECT Calibrate in the display and the con firmation message will display On the top line the millivolt 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 scales with percentage of oxygen and barometric pressure Fig 2 79 Fig 2 79 Pressing the MENU button will prevent the calibration Pressing SELECT will calibrate the sensor displays If any display shows FAIL the calibra tion has failed because the mV reading is out of range Fig 2 80 2 81 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 vapor If you are using a calibration kit with no water vapor and 100 O you can set the calibration gas to 100 It can also be set to other values if pure oxygen is not available Fig 2 80 The calibration takes into acc
2. NOTE During a dive the Switch Setpoint menu item will be the first item displayed The Turn Off and Calibrate displays are disabled 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 Fig 2 91 Fig 2 92 30 SELECT GAS 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 Fig 2 93 Gases are always sorted from higher to lower oxygen content Press the SELECT button when Select Gas is displayed and the first available diluent gas will be displayed Fig 2 94 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 2 95 If you increment past the number of gases available the display will fall back out of the Select Gas display without changing the selected gas The current gas will flash YELLOW when a more appropriate gas is defined Use the Confirm button to select a gas The
3. DEFINE GAS 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 2 105 Pushing SELECT when Define Gas is displayed presents the function to define gas number 1 Fig 2 106 Pushing the MENU button will display the next gas Fig 2 107 Pushing SELECT will allow you to edit the current gas The gas contents are edited one digit at a time The underline will show you the digit being edited Fig 2 108 Each push of the MENU button will increment the digit being edited When the digit reaches 9 it will roll over to O Fig 2 109 Fig 2 105 Fig 2 106 Fig 2 107 Fig 2 108 Fig 2 109 33 Pushing SELECT will lock in the current digit and move on to the next digit Fig 2 110 Pushing SELECT on the last digit will finish editing that gas and bring you back to the gas number Fig 2 117 Fig 2 110 Any gases that have both oxygen and helium set to 00 will not be dis played in the Select Gas function Pushing MENU will continue to increment the gas number Fig 2 112 ig 2 111 NOTE The 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 O2
4. 250 VPM BProfile ft Buhlmann Gradient 96 PR 9096 Gradient 90 Gradient 300 A VPM B PROFILE B VPM B GFS PROFILE e Gradient Factor Surfacing GFS adds conservatism to the shallow stops of a VPM B profile e Inthe pure VPM B profile the B hlmann ZHL 16C Gradient exceeds 90 e the VPM B GFS profile the shallow stops have been lengthened because the gradient is limited to 90 e GFS adds more time to dives that require more decompression Dives with deco times under 45 minutes are typically not affected e 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 99 and the most conservative is 70 The default is 90 ee EXAMPLE DIVE This is an example of the displays that might be seen on a dive This ex Fig 2 57 ample shows a complicated dive with multiple Closed Circuit CC gases and multiple Open Circuit OC bail out gases A 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 2 57 Since we are on the surface and not diving MENU will bring up Turn Off then Calibrate Once the loop is flushed with o
5. 2 16 Fig 2 17 Fig 2 18 Fig 2 19 Fig 2 20 Fig 2 21 Fig 2 22 Fig 2 23 Fig 2 24 Fig 2 25 NOTE On 10 ft 3 m last stops The Wrist Display gives you the option of 10 ft 3 m or 20 ft 6 m last stops You may perform 20 ft 6 m stops even if the unit is set for 20 ft 6 m stops with no penalty since the Wrist 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 AVERAGE DEPTH Displays the average depth of the current dive updated once per second When not diving shows the average depth of the last dive Fig 2 26 AVERAGE DEPTH OF ATMOSPHERES AvgATM 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 Fig 2 27 CIRCUIT MODE The current breathing configuration One of OC Open circuit Fig 2 28 CC Closed circuit Fig 2 29 CURRENT GAS The current gas shown as a percentage of Oxygen and Helium The remainder of the gas is assumed to be Nitrogen Fig 2 30 In closed circuit mode this gas is the diluent In open circuit mode this is the breathing gas Flashes Red when there is another programmed gas that is more appro priate at the current depth than the current gas Fig 2 37 Fig 2 26
6. 2 769 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 when there is less ambient light in order to conserve battery life ALTITUDE 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 set ting this to SeaLvl will assume that surface pressure is always 1013 mBar 1 atmosphere Fig 2 170 WARNING When diving at altitude you must manually ac tivate the computer and set the Altitude option to Auto the default setting is SeaLvl before diving to properly track inert gas loading no decompression and decom pression times Further when diving at altitude you must turn the computer on at the surface If the auto on safety feature is allowed to 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 2 171 FLIP SCREEN This function displays the contents of the screen upside down and reverses the button functions It allows the computer to be worn on the right arm Fig 2 172 52 Fig 2 167 Fig 2 168 Fig 2 169 Fig 2 170 Fig 2 171 Fig 2 172 SYSTEM SETUP DATE The first System Setup changeable op
7. Fig 2 27 Fig 2 28 Fig 2 29 Fig 2 30 Fig 2 31 NO DECOMPRESSION LIMIT NDL The time remaining in minutes at the current depth until decompression stops will be necessary Fig 2 32 Displays in Yellow when the NDL is less than 5 minutes Fig 2 33 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 2 34 GF99 The raw percentage of the B hlmann allowable supersaturation at the current depth Fig 2 35 5 The time to surface TTS if you were to stay at the current depth for 5 more minutes Fig 2 36 TIME TO SURFACE TTS The time to surface in minutes in the current circuit mode Fig 2 37 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 The maximum depth of the current dive Fig 2 38 When not diving displays the maximum depth of the last dive CNS TOXICITY PERCENTAGE Central Nervous System oxygen toxicity loading percentage Fig 2 39 Flashes Red when 100 or greater Fig 2 40 The CNS percentage is calculated continuously even when on the surface and turned off Removing the battery will reset the CNS percentage 4x Fig 2 32 Fig 2 33 Fig 2 34
8. Fig 2 35 Fig 2 36 Fig 2 37 Fig 2 38 Fig 2 39 Fig 2 40 SETPOINT The current PPO setpoint Displays in Yellow when the setpoint is 0 19 Fig 2 41 AVERAGE PPO The average PPO of the current breathing gas Fig 2 42 In OC mode displays in Flashing Red when less than 0 19 or greater than 1 65 Fig 2 43 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 2 44 DILUENT PPO 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 Fig 2 45 GAS PPO Only displayed in OC mode Displays in Flashing Red when less than 0 19 or greater than 1 65 Fig 2 46 GRADIENT FACTOR GF Low GF High Fig 2 47 See Section 5 for further discussion on gradi ent factors Fig 2 41 Fig 2 42 Fig 2 43 Fig 2 44 Fig 2 45 Fig 2 46 Fig 2 47 16 PRESSURE The pressure in millibars Two values are shown the surface surf pressure and the current now pressure Fig 2 48 The current pressure is only shown on the surface i e when not diving The surface pressure is set when the Wrist Display is turned on If the Altitude setting is set to SeaLvl then surface pressure is always 1013 mil libars TEMPERATURE The current temperature in degrees Fahrenheit when depth in feet or degrees Celsius when depth i
9. and He to 00 Fig 2 113 The computer will display all 5 gas entries available to allow you to enter new gases Fig 2 112 Pressing MENU one more time when the fifth gas is displayed will return you to the Define Gas menu item Fig 2 114 NOTE Only enter the gases you are actually carrying on the dive With Fig 2 113 radio station gases the computer has a full picture of the OC 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 OC because the computer already knows what the gas sets are You can still add or remove a gas during the dive if needed Fig 2 113 Fig 2 114 34 DIVE PLANNER Fig 2 115 INTRODUCTION e Calculates decompression profiles for simple dives e In closed circuit CC mode also calculates open circuit OC bail out BO SETUP Fig 2 115 Uses the current gases programmed into the Wrist 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 bottom time respiratory minute volume and PPO DURING A DIVE Computes the decompression profile assuming the ascent will begin im mediately There are no settings to enter RMV is last used value NOTE Residual tissue loading and CNS LIMITATIONS from recent m dives will be use
10. casionally from a transient problem like a battery bounce after an impact It can also be the result of a hardware problem The UPGRADE RESET message shows up after a software update Fig 2 194 This is the normal event that shows the computer has been rebooted after the software update Fig 2 190 Fig 2 191 Fig 2 192 Fig 2 193 Fig 2 194 The BROWNOUT RESET error usually occurs when the battery dies while the computer is asleep Fig 2 195 If the battery gets too low to maintain system integrity the hardware will force the system into reset The following messages are reporting internal hardware failures Fig 2 196 2 199 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 This is not an exhaustive list There are other errors that could be report ed and more checks are added with each software update Fig 2 195 Fig 2 196 Fig 2 197 Fig 2 198 Fig 2 199 BATTERY CHANGE The Wrist Display has a battery compartment in the side of the case Unscrew the battery cap counter clockwise with a large coin Fig 200 Bend a paperclip into a hook shape Hook the battery holder with the paperclip and pull it out Fig 207 Replace the battery with only a SAFT LS14500 Push the wires into t
11. 2 118 The final result screen shows the total dive time the time spent on deco and final CNS Fig 2 119 If 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 OC will be reported Fig 2 120 Fig 2 116 Fig 2 117 Fig 2 118 Fig 2 119 Fig 2 120 NDL DISPLAY 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 Fig 2 121 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 decompression ceiling Fig 2 122 The next selection is CEIL With this setting as long as the NDL time is 0 you have a decompression ceiling the raw ceiling will be displayed instead of the NDL This is the equivalent of the Man on a rope 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 2 123 It is the author s opinion that all stops should be honored It seems intuitive that i
12. 2 83 Fig 2 84 Fig 2 85 EXTERNAL BATTERY ALERTS SOLENOID BATTERY 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 Wrist 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 ceasing operation Low Ext Battery when battery falls below operating threshold 7V Fig 2 86 After user confirms the small red text persists as long as the low battery condition remains Fig 2 87 If the battery falls so low that the solenoid does not fire or current falls out of range a Solenoid Alert occurs Fig 2 88 After user confirms the small red text persists as long as the Solenoid Alert condition remains Fig 2 89 If Ext V is viewed it appears in red Fig 2 90 Eveready etc Off brand discount batteries have no place in life support gear and must never be used to power any component of your PRISM 2 WARNING Use only name brand batteries Duracell Fig 2 86 Fig 2 87 Fig 2 88 Fig 2 89 Fig 2 90 SWITCH SETPOINT When SELECT is pushed with either of these displays the displayed set point on the right will be selected Fig 2 97 2 92
13. 20 seconds to 600 seconds 10 minutes Default is 60s Since the Wrist Display 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 Wrist Display is still in dive mode AND is at the surface 55 56 ADVANCED CONFIGURATION Advanced Configuration allows changing of PPO limits All values are in absolute atmospheres ATM of pressure 1 ATM 1 013 Bar Fig 2 185 Fig 2 185 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 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 20 ft 6 m Default 1 61 CC Min 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 2 or High PPO2 alert is displayed when the above limits are violated for more than 30 seconds A WARNING Do not change
14. GF Lo o Gradient generates 2 first stop 5 a a 8 A 2 02 NS na linear function 2 for gradual Gradient Factors e E e GF Hi surfacing value maintains safety margin First Stop 0 Ambient Pressure absolute This number can be used in several ways First it can be used to calcu late an aggressive ascent that still has some justification in decompres sion 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 B hlmann 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 decompression zone by keeping the gradient above O Another use would be to observe the rapidly increasing gradient in the last 10 feet to the surface and slow that ascent All of this is based on gradient theory that may be completely false There is significant disagreement in the decompression research com munity about the nature and practice of decompression Any techniques described here should be considered experimental but the concepts may be useful to the advanced diver The last selection is 5 This feature has been borrowed from Dan Wible s CCR2000 computer
15. bottom line of the display shows the selected gas An A will appear next to the currently active gas 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 Fig 2 93 Fig 2 94 Fig 2 95 SWITCH TO OC CC Depending on the current computer setting this selection will show as either Switch CC gt OC or Switch OC gt CC Fig 2 96 2 97 Pressing SELECT will select the displayed mode for decompression calculations 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 t
16. 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 until they have mastered the proper set up and operation of the Hollis PRISM 2 rebreather This includes new PRISM 2 divers as well as PRISM 2 certified divers who have been away from diving for an extended period of time 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 circuit breathing loop circulate breathing gas that may not contain 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 PRISM 2 computer controlled addition of oxygen to the breathing loop is intended as a fail safe back up system to you the primary controller If you either knowingly or by inattention allow the PRISM 2 computer to control oxygen addition to the breathing loop at any time you are diving outside the principals of your PRISM 2 training assuming any and all possible risk WARNING DECOMPRESSION This computer is capable of calculating deco stop requirements These calculations are predictions of physiological decompression requirements Dives requiring
17. gt RISAN DISPLAYS AND ELECTRONICS HUULTE WS T Fu i REV 1 EDITORS Jeffrey Bozanic Chauncey Chapman John Conway Gerard Newman CONTRIBUTORS Kevin Watts Document Control Number 12 4100 Rev 1 Publish Date 5 9 2013 WRITTEN BY Matthew Addison Bruce Partridge This is the operations manual for the HOLLIS PRISM 2 This manual specifications and features of the PRISM 2 are proprietary and copyright Hollis Inc 2012 This document cannot be copied or distributed without the prior agreement and authorization from Hollis Inc All information contained is subject to change Contact the manufacturer for the latest information www hollisgear com The PRISM 2 is manufactured in the USA by Hollis Inc 2002 Davis Street San Leandro CA 94577 USA Ph 510 729 5100 EC Type approved by SGS UK Ltd Weston super Mare BS22 6WA Notified Body No 0120 Testing conducted by ANSTI Test Systems Hants To ensure your user information is up to date Please check www hollisgear com for updates to this manual WARNINGS CAUTIONS AND NOTES Pay attention to the following symbols when they appear throughout this docu ment They denote important information and tips WARNINGS are indicators of important information that if ig nored may lead to injury or death NOTES indicate tips and advice TABLE OF CONTENTS General Safety Statements amp Warni
18. page Adv Config 2 OC Min PPO2 OC Max PPO2 CC Min PPO2 0 1 Deco 2 0 CC Max PPO2 1 Done Edit Fig 2 179 Fig 2 180 Fig 2 181 At the top level menu you can either enter the Advanced Configuration or reset the Advanced Configuration values to their defaults Fig 2 179 2 181 Advanced Config Screens SALINITY The salinity setting sets the density of water in kilograms per cubic meter kg m A cubic meter of pure water weighs 1000 kg Therefore this value sets the weight of the dissolved salts in the water For example a value of 1030 kg m means there are 30 kg of salts per 1000 kg 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 Fig 2 182 Fig 2 182 Common Values e 1000 kg m Fresh water e 1020 kg m EN13319 value Predator default between fresh and salt water e 1025 kg 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 Green Fig 2 183 2 184 Cyan and Gray Title Colors green and blue also available DEPTH TIME STOP TIME 02 HE 14 A Uu f benar Fig 2 183 Fig 2 184 END DIVE DELAY Sets the time in seconds to wait before ending the current dive This value can be set from
19. s M value Therefore staying at or below GF 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 not exceed that value In this way you know that your tissue compartments are never over 8096 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 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 wrist unit uses 30 85 as its default setting 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 3096 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 Assume you hit your first stop GF 0 30 at
20. setting is more familiar to many users as it tends to mimic non PID controlled solenoids Fig 2 161 For shallow dives of 150 ft 45 7 m setting the solenoid to SLOW is recommended 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 2 162 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 2 163 NOTE The Up Auto SP switch occurs during the descent The Down Auto SP switch occurs on the ascent The next option is still a part of the switch up function and enables the editing of the switch depth Fig 2 164 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 2 165 The Auto Setpoint Switch to the up and down settings will only occur once respectively during a dive For instance let s say your Auto Up is set at 60 ft 18 2 m and your Auto Down is set at 40 ft 12 1 m The com puter automatically switches to High Setpoint up switch when 60 ft 18 2 m is exceeded But if you have to return to a depth above 40 ft 12 1 m momentarily for any reason the computer will switch to the programmed Low Setpoint down switch It will not Auto Setpoint S
21. staged decompression are substantially more risky than dives that stay well within no stop limits They require specific training in CCR decompression procedures 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 A 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 WARNING PROPER BATTERIES ONLY name brand batteries such as Duracell or Eveready may be 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 Therefore they 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 batteries 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 Because o
22. these values unless you under stand the effect See descriptions above ERROR DISPLAYS The system has several displays that alert an error condition All of these 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 button will take you into the menu and a push on both buttons will show the mil livolt display The error message will keep returning until it is dismissed with a SELECT The HIGH PP OXYGEN message will appear if the average PPO goes above 1 6 for more than 10 seconds Fig 2 186 It will come back after being dismissed if the situation occurs again The LOW PP OXYGEN message will appear if the average PPO goes below 0 4 for more than a few seconds Fig 2 187 It will come back after being dismissed if the situation occurs again It is not unusual to get this error immediately after submerging with a hypoxic mix The first breath after submerging floods the loop with low PPO gas The
23. 110 ft We now have two known points Point 1 is 110 0 30 that is at 110 ft 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 Current Depth HighGFDepth LowGFDeptrh But since the high gradient factor is reached at the surface HiGFDepth 0 So HighGF LowGF LowGF Depth MaxGF HighGF Current Depth Therefore if you hit your first GF 0 30 at 110 ft then your LowGFDepth 110 Before you can ascend to 100 ft you must let off enough tissue compartment pressure so that when you arrive at 100 ft the GF of your tissue compartments does not exceed 0 35 calculated as MaxGF 0 85 ES i 00 You can ascend to 90 ft when your tissue compartments let off enough pressure at your 100 ft stop so that when you reach 90 ft 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 If you understood the above explanation then you see why divers say that setting your GF parameters to 10 90 10 80 etc helps generate deep stops The low GF of 10 means a stop must be gene
24. D number 1 L to R reports the readings from O sensor number 1 and so forth as reported on the Wrist Display Fig 2 2 The Heads Up 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 LED s 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 The PO light states encountered on the Heads Up Display are shown in the table on the following page and are as follows While in dive mode reporting loop PO 1 0 ATM is considered the mid line for the Heads Up 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 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 the centerline of 1 0 PO Fig 2 1 HUD WRIST DISPLAY 4 Fig 2 2 NOTE Bi color LEDs are actually two different LEDs in one case They consist of two dies connected to the same two leads antiparallel to ea
25. Ds will flash green red 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 will cause all three sensors to fail calibration concurrently LOST SIGNAL If the Heads Up Display were to lose signal for any reason the LED corresponding to the cell will oscillate green red continiously without pause 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 Wrist Display Wrist Display The display has five areas There are three title areas and three data display areas Fig 2 5 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 area shows depth battery warning dive time ascent rate first stop depth and first stop time Fig 2 5 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 glows yellow after the battery is less than 3 28 V for 30 seconds Below 3 15 V the battery indicator will flash r
26. ING Use only name brand batteries Duracell LOW BATTERY WARNING The Heads Up Display is powered by a SAFT 3 6V AA battery mounted in the battery compartment in the head After the LED check the Heads Up Display it will check its battery state If the battery charge is low the display will illuminate all three LEDs orange combined red and green for 30 seconds Fig 2 4 and then go into operational mode if enough battery charge remains for it to do so Low battery warnings will Fig 2 4 only occur once at power on and will not be repeated until the Heads Up Display power is cycled off and on again when you receive a low battery warning Failure to change the battery when the Heads Up Display indicates a low battery during power on could result in the LED Heads Up Display shutting down unexpectedly mid dive WARNING You must change the Heads Up Display battery CELL CALIBRATION ACCEPTED If calibration of all three cells have been accepted the Heads Up 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 in 5 second intervals until a successful calibration of that cell has been achieved CELL CALIBRATION FAILED Any cell which fails calibration will flash green red in 5 second intervals until a valid calibration for that cell is accepted by the controller If all 3 sensors fail calibration all LE
27. 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 2 126 Fig 2 126 SETPOINT 19 Fig 2 127 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 maintenance 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 started with the 19 setpoint selected Fig 2 128 A WARNING Never breathe from the Loop when the com puter is set to a set point of 0 19 Fig 2 127 Fig 2 128 39 DIVE LOG MENU DISPLAY LOG At the Dive Log prompt press SELECT to view the most recent dive Fig 2 129 2 130 The profile of the dive is plotted in blue with decompression stops plotted in red The following information is displayed Fig 2 131 Fig 2 129 e Maximum and Average depth Dive number e Date mm dd yy and time 24 hr clock of dive start e Length of dive in minutes Fig 2 130 Press MENU to see the next dive or SELECT to quit viewing logs UPLOAD LOG See Section 18 Firmware Upload and Dive Log Download Instructions Fig 2 131 EDIT LOG NUMBER The dive log number can be edited This is useful if you need to c
28. PSA work When 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 The issue with using PSA derived oxygen in hyperbaric applications especially rebreathers is that the adsorbents 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 NOTE Absorbent or a
29. SETUP The fourth submenu is O Setup This menu allows the user to edit the Oxygen settings CAL FO This allows the user to set the expected FO for calibration It is used in three situations Fig 2 159 The first is when pure oxygen isn t available and the oxygen is being gen erated by a membrane or PSA systems The oxygen in that case might be 96 O and a few percent of Argon See full explanation on the follow ing page Fig 2 159 The second is when you are using a calibration kit and are assured of us ing 100 O with no water vapor If any change is made in this screen the current calibration will be dis carded and the PO readings will display FAIL The computer must be recalibrated with the new settings 47 48 WHEN TO USE THE CAL FO 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
30. ase in atmospheric pressures Hollis recommends completion of a specialized Altitude training course by a recognized training agency prior to diving in high altitude lakes or rivers PRISM 2 DISPLAYS AND ELECTRONICS WELCOME Your PRISM 2 utilizes the best CCR electronics package avail able today to monitor and control operation You will find the electronics are reliable and simple to use This manual will walk you through all the basics as well as the subtleties of the displays and electronics For complete understanding of the PRISM 2 use this manual in conjunction with the main PRISM 2 User Manual doc 12 4072 Remember that it is far easier and safer to learn what all the different alarms warnings and indications mean before you jump in the water If after reading this manual you are not clear on any topics ask your PRISM 2 instructor for further information vii DISPLAYS ELECTRONICS OPERATION DISPLAYS CONTROLLER There are two separate diver display systems in the PRISM 2 The Heads Up Display and the Wrist Display Heads Up Display HUD The Heads Up Display Fig 2 1 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 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 LE
31. by using levels of conserva tism The levels of conservatism are pairs of number like 30 85 The default of the system is 30 70 The system provides several settings that are more aggressive than the default Don t use the system until you understand how it works GRAPH FROM ERIK BAKER S CLEARING UP THE CONFUSION ABOUT DEEP STOPS Pressure Graph Gradient Factors 1 8 6 4 2 0 A Gradient Factor is simply a decimal fraction or percentage of the M value Gradient GF Lo M value Gradient Factors GF are defined Gradient generates between zero and one 0 lt GF first stop lt 1 A Gradient Factor of 0 represents the ambient pressure line Surface Pressure A Gradient Factor of 1 represents gt linear function the M value line for gradual change in Gradient Factors modify the Gradient conservatism within the Factors original M value equations for decompression zone Compartment Inert Gas Pressure absolute GF Lo determines the depth of the first stop Used to generate Stop The lower Gradient Factor value deep stops to the depth of the deepest possible deco stop Hi surfacing value maintains safety margin First Ambient Pressure absolute X GRADIENT FACTORS EXPLAINED BY KEVIN WATTS BACK ENTER GRADIENT FACTORS 20 First the gradient factor formula tells us that at a Gradient Factors of 1 0 GF 1 0 you are at B hlmann
32. ch other Current flow in one direction emits one color and cur rent 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 ap pearance CAUTION DO NOT attempt to unscrew the Heads Up Display wir ing from the head or the Wrist Display wiring from either end of the wire THIS IS NOT A THREADED PART Attempting to unscrew or remove either wiring will destroy the wir ing and quite possibly the hardware sealing surface in the Head or Wrist Display Flash 5 Sec 5 sec 5 sec Solid 5 sec Lost Signal Continuous Continuous Once only Solid 30 sec Fig 2 3 1 5 1 1 0 95 1 05 LED CHECK AT TURN ON When you first turn on the Heads Up 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 O cell information Eveready etc Off brand discount batteries are ac ceptable 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 WARN
33. d The Wrist Display Dive Planner is intended for simple dives in calculating the Multi level dives are not supported profile The Wrist Display Dive Planner makes the following assumptions e Ascent and descent rates are 33 ft min 10 m min e For OC the gas in use will be the gas with the highest PPO less than 1 61 e For CC the Diluent gas in use will be the gas with the highest PPO less than 1 05 e For CC the PPO is constant for the entire dive e The RMV is the same while diving as during deco 35 36 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 The results are given in tables showing Stp Stop Depth In feet or meters Tme Stop Time In minutes Run In minutes s Qty Gas Quantity in CuFt or liters OC and BO only The first two rows are special 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 2 116 2 117 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
34. dsorbent 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 Simply it is a misnomer that the dive industry adopted Despite not being the best word choice we will use the standard absorbent throughout the rest of this text to avoid confusion However because of Argon s heightened narcotic 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 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 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 Wrist Display and navigate to your O s
35. e TTS is 15 minutes To turn the comput er on press both The computer works in both metric and imperial for depths and the Menu and the temperatures The depth shows a decimal point when the depth is Select buttons at between 0 and 99 meters It shows no decimal point if the display is set the same time to feet BUTTONS MENU LEFT From the default display pressing MENU brings up the menu e Once inthe menu system MENU moves to the next menu item Ifthe current function is an edit pressing MENU increments the current display SELECT RIGHT Inthe menu system the select button saves the current value or ex ecutes the command e Out of the menu system the select button brings up information dis plays BOTH BUTTONS When the computer is off pressing MENU and SELECT at the same time will turn the computer 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 2 7 Fig 2 7 The right button SELECT is used to accept the current choice Pressing SELECT with this screen displayed will enter the Select Gas function Fig 2 8 Fig 2 8 In the Select Gas function MENU increments the gas number Fig 2 9 SELECT would select closed circuit gas 2 Fig 2 10 When the system is not in a menu pushing SELECT will bring up information displays with various dive status informatio
36. e not using For instance some divers do most of their diving with a select group of mixes They can enter up to 5 mixes into their controller and turn them on or off depending on what mixes are appropriate for the dive they are doing that day Mixes turned off are not used in the decompres sion calculations but can still be used underwater which will automatically turn that gas on It will then be used in the decompression calculation If the feature is set to off then gases can be added deleted edited but not turned off and on OC GASES 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 2 157 For a description of how to appropriately set each gas please see Define Gas Section 14 Fig 2 154 Fig 2 155 Fig 2 156 Fig 2 157 CC GASES 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 section contained earlier in this manual The interface conveniently displays all five gases simultaneously Fig 2 158 Fig 2 158 For a description of how to appropriately set each gas see Define Gas Section 14 O
37. ection 18 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 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 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 110 DISPLAY ELEMENTS DESCRIPTIONS CLOSED CIRCUIT PARTIAL PRESSURE OF 0 PPO The wrist unit will Flash Red PPO when less than 0 4 or greater than 1 6 Fig 2 12 Shows internal sensor PPO will show three values Shows the current setpoint which is the PPO at which the wrist unit assumes the breathing loop is being maintained Displays 3 sensors Displays PPO in Yellow when sensor is voted out Fig 2 13 Displays FAIL when calibration is not valid Fig 2 14 When in OC mode the sensor values continue to display This sh
38. ed 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 fpm or 3 mpm 1 2 and 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 2 6 If a 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 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 when cycling through menus Fig 2 5 Fig 2 6 The no decompression limit NDL is zero since we are in NOTE decompression and the time to surfac
39. etup menu The first sub menu item is Cal PPO The default is 0 98 Adjust the value to 2 100 s 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 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 50 SOLENOID SPEED 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 during deep dives below 150 ft 45 7 m Fig 2 160 The SLOW
40. f 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 Diagram showing rapid discharge of non branded batteries which in life support gear can result in unnecessary hazards Power Watts The full article Are Expensive Batteries Worth The Extra Cost is available at Wired com Image courtesy of Rhett Allain Wired 0 050 10000 20000 30000 40000 50000 60000 70000 80000 90000 Time s WARNING It is extremely important that you read this manual and understand completely before attempting to use your new Hollis dive computer vi WARNING Each numeric and graphic display represents a unique piece of information It is imperative that you understand the formats ranges and values of the information represented to avoid any possible misunderstanding that could result in error WARNING As with all underwater life support equipment improper use or misuse of Hollis computers can result in serious injury or death WARNING Helium features are intended for use by divers who have successfully completed a recognized course in CCR diving with Trimix mixtures and have knowledge of the potential risks and hazards of diving CCR with Trimix WARNING Diving at high altitude requires special knowledge of the variations imposed upon divers their activities and their equipment by the decre
41. f 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 B hlmann 99 99 profile Fig 2 124 The selection is GF99 With this setting as long as the NDL time is O 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 current 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 2 125 Fig 2 121 Fig 2 122 Fig 2 123 Fig 2 124 Fig 2 125 GRAPH FROM ERIK BAKER S CLEARING UP THE CONFUSION ABOUT DEEP STOPS Pressure Graph Gradient Factors 1 8 6 4 2 0 y 1 j n g M value
42. han was predicted and now there is a 100 foot stop Fig 2 70 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 2 77 Fig 2 66 Fig 2 67 Fig 2 68 Fig 2 69 Fig 2 70 Fig 2 71 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 2 72 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 2 73 The second push 2 brings up Switch CC gt OC Fig 2 74 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 gas with the highest PPO less than 1 6 and recalculated the decom pression based on the new profile Fig 2 75 At 20 feet one push on MENU brings up select gas Fig 2 76 A push on SELECT enters the select gas menu and another SELECT picks the O Since the gases are sorted by oxygen content O is the first gas offered Fig 2 77 Fig 2 72 Fig 2 73 Fig 2 74 Fig 2 75 Fig 2 76 Fig 2 77
43. he battery compartment before inserting the battery holder Align the flat edge of the battery holder towards the button Fig 202 Gently press the battery holder into the battery compartment Tighten the battery cap clockwise with a large coin until it is flush with the case Fig 203 Fig 2 200 Fig 2 201 Fig 2 202 Fig 2 203 STORAGE The Wrist Display should be stored dry and clean Do not allow salt deposits to build up on your Wrist Display Wash your Wrist Display with fresh water to remove salt and other contaminants Do not use deter gents benzene or other cleaning chemicals Allow to dry naturally 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 pro tection for the depth sensor After cleaning store the Wrist Display upright out of direct sunlight in a cool dry and dust free place Avoid exposure to direct ultra violet radia tion and radiant heat SPECIFICATIONS e Atmospheric Range 800 1050 mBar e Transducer Depth Range 14 ATA e Transducer Depth Accuracy 2 5 Depth of Dive Time Start 1 6 m of Sea Water Depth of Dive Time Stop 0 9 m of Sea Water e Operating Temperature Range 4 to 32 Short Term hours Temperature Range 10 C to 50 C e Long Term Storage Temperature Range 5 C to 20 C e Crush Depth Limit 185 m e Weight 0 4 kg e Bat
44. he next field Once the user has pressed SELECT through all the fields the new user preferences will be saved DIVE SETUP The first submenu is Dive Setup The options contained here are the same as those accessed from the Dive Setup section described 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 Fig 2 152 2 153 For a description of the functionality of each option please see the Dive Setup section Fig 2 150 Fig 2 151 Fig 2 152 Fig 2 153 45 46 DECO SETUP The Deco Setup submenu allows for adjustments that affect decompres sion Conserv GF The Wrist Display implements Gradient Factors Fig 2 154 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 Under standing M values The articles are readily available on the web You might also want to search for Gradient Factors on the web Last Stop You can set the computer to calculate a final decompression stop at either 20 ft 6 1 m or 10 ft 3 04 m Fig 2 155 Gas On Off With the feature Fig 2 156 turned on you can select the mix es you are carrying and turn them on You can also turn off the gases you ar
45. igh Setpoint e Define Gases e Dive Planner e Conservancy e NDL Display Brightness Dive Log Display Log e Upload Log e Edit Log Number e Setpoint gt 19 e System Setup e Dive Setup e Deco Setup e OC Gases e CC Gases Setup e Auto SP Switch e Display Setup e System Setup e Advanced Configuration e Salinity e Title Color Dive Delay e OC e CC Min PPO CC Max PPO MENU STRUCTURE DIVE MODE 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 e Switch Setpoint e Select Gas e Switch Open Circuit Closed Circuit Dive Setup e Edit Low Setpoint Edit High Setpoint e Define Gases e NDL Display e Brightness The Status Screens Are e Gases no decompression limit and time to surface Diluent PPO CNS and average PPO e Oxygen sensor millivolts e Max depth average depth average atmospheres e Water temperature current Gradient Factor current fixed Oxygen e GF99 decompression ceiling time to surface in 5 minutes and time to surface e Battery voltage e Pressure e 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 S
46. ill now Decrypt Fig 2 748 which will take approxi mately 4 minutes WARNING Do not remove the battery at this time After decryption the Wrist Display will process which will take an additional 4 minutes Fig 2 749 The screen upon completion of processing will read Tissues Cleared which must be confirmed The screen will then read Upgrade Reset which also must be confirmed The Wrist Display now has the most up to date firmware Fig 2 146 Predator V15 aes Fig 2 147 Fig 2 148 Fig 2 149 SYSTEM SETUP System Setup contains configuration settings that are only set be tween dives This menu item doesn t appear during dives Each of the items in the System Setup menu can only be accessed on the surface Fig 2 150 All of the submenus contained within System Setup make use of a con venient user interface The MENU and SELECT buttons Fig 2 151 are context sensitive to each sub menu and individual setting 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 options in this submenu Once the user has pressed SELECT to edit a submenu MENU will cycle the user through the different submenu listings while SELECT will let the user edit those listings 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 t
47. lear the dive log but want the numbering to continue from where you left off Fig 2 132 At the Edit Log Number prompt press SELECT to begin editing While Fig 2 132 editing use MENU to change the value of the currently underlined digit and SELECT to move to the next digit Fig 2 133 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 Fig 2 133 AO CLEAR LOG e Clear Log prompt press SELECT You will be asked to SELECT again Press SELECT to begin clearing the log or press MENU to cancel Fig 2 134 2 135 e It will take about 1 minute to clear the log Do not remove the battery during this time e Clearing the log will not clear the dive number NOTE The Wrist 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 2 134 Fig 2 135 41 FIRMWARE UPLOAD DIVE LOG DOWNLOAD INSTRUCTIONS No firmware file selected Select File Plug the Bluetooth dongle into your PC if Bluetooth support is not m built in 3 Select firmware update file and start Place the Wrist Display within 6 inches of the Bluetooth dongle Go to http www hollisgear com PRISM 2 library and download the most recent version of PRISM 2 Desktop with Air and the latest firmware up date Uninstall any old ver
48. n This is the first information display showing the diluent PPO amount the current CNS loading the setpoint and the average PPO being used for decompres sion calculation Fig 2 11 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 settings 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 KEY CHARACTERISTICS 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 in surface mode Fig 2 9 Fig 2 10 Fig 2 11 MENU STRUCTURE SURFACE MODE The Full Menu Structure Is Below e Turn Calibrate e Switch Setpoint Select Gas Switch Open Circuit Closed Circuit Dive Setup Edit Low Setpoint e Edit H
49. n meters Fig 2 49 EXTERNAL VOLTAGE The external voltage of the solenoid battery Fig 2 50 INTERNAL VOLTAGE The Wrist Display s internal battery voltage Fig 2 51 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 The raw millivolt readings from the O sensors Fig 2 52 DATE AND TIME In the format MM DD YY Fig 2 53 24 hour clock time SERIAL NUMBER Unique serial number identifier for every Wrist Display Fig 2 54 Fig 2 48 Fig 2 49 Fig 2 50 Fig 2 51 Fig 2 52 Fig 2 53 Fig 2 54 VERSION The version number indicates the features available on the Wrist Display The last two numbers are the firmware version Fig 2 55 SURFACE INTERVAL The time in days hours and minutes since the last dive ended Reset when the battery is removed Fig 2 56 Fig 2 55 Fig 2 56 DECOMPRESSION GRADIENT FACTORS The basic decompression algorithm used for the computer is B hlmann 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 educa tion about decompression algorithms but he is in no way Responsible for the code we have written The computer implements Gradient Factors
50. ngs Welcome SECTION 1 DISPLAYS CONTROLLERS LED Heads Up Display SECTION 2 WRIST DISPLAY SECTION 3 BASIC SETUP SECTION 4 DISPLAY ELEMENTS DESCRIPTIONS SECTION 5 DECOMPRESSION GRADIENT FACTORS ARTICLE GRADIENT FACTORS EXPLAINED SECTION 6 VPM b GFS EXPLAINED SECTION 7 EXAMPLE DIVE SECTION 8 MENU REFERENCES SECTION 9 CALIBRATION PROBLEMS SECTION 10 EXTERNAL SOLENOID BATTERY ALERTS SECTION 11 SWITCH SETPOINT SECTION 12 SELECT GAS SECTION 13 SWITCH TO OC CC SECTION 14 DIVE SETUP SECTION 15 DIVE PLANNER SECTION 16 SETPOINT 19 SECTION 17 DIVE LOG MENU iv vi vii 11 18 19 22 23 26 27 28 29 30 31 32 35 39 40 SECTION 18 FIRMWARE UPLOAD DIVE LOG SECTION 19 SYSTEM SETUP ARTICLE WHEN TO USE THE CAL PPO FUNCTION DIVING YOUR PRISM 2 WITH O FILLS OF LESS THAN 99 8 PURITY SECTION 20 DISPLAY SETUP SECTION 21 SYSTEM SETUP SECTION 22 ADVANCED CONFIGURATION MENUS SECTION 23 ERROR DISPLAYS SECTION 24 BATTERY CHANGE SECTION 25 STORAGE Specifications SECTION 26 GLOSSARY OF TERMS 42 19 48 52 53 54 57 60 61 62 UJ m T Qi O zi m Z z 0 iv GENERAL SAFETY STATEMENTS WARNINGS A WARNING GENERAL SAFETY No person should breathe from or attempt to operate in any way a Hollis PRISM 2 rebreather or any component part thereof without
51. o deal with the computer will make a best guess of which gas the diver would choose When switching the computer from CC mode to OC mode the computer will continue to maintain the active O setpoint Fig 2 98 You can manually adjust setpoint after switching the computer to OC mode to as low as 0 4 ata O Fig 2 96 Fig 2 97 Fig 2 98 c DIVE SETUP These screens are showing controller displays Pressing SELECT will enter the Dive Setup sub menu Fig 2 99 LOW SETPOINT This item allows you to set the low setpoint value It will display the currently selected value Default values from 0 4 to 1 5 are allowed A press of MENU will increment the setpoint Fig 2 100 Press the SELECT button when Edit Low SP is displayed and the edit display will be shown In this example it is set at the lowest valid value setpoint 0 4 Fig 2 101 Another press of MENU will increment it again Fig 2 102 If SELECT is pushed the currently displayed setpoint will be selected and the display will return to the Low SP menu item Fig 2 103 If the highest allowable programmed value or the default 1 5 has been passed the value will return to the lowest programmed value or the de fault 0 4 HIGH SETPOINT The high setpoint function works exactly like the low setpoint function Fig 2 104 Fig 2 99 Fig 2 100 Fig 2 101 Fig 2 102 Fig 2 103 Fig 2 104
52. ount the altitude at which the computer was turned on For example if the altitude was 885 mBar or 87 ATA then with a 98 calibration gas the sensors would calibrate to 85 Fig 2 81 NOTE The Calibrate menu item will not display during a dive 26 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 re turn to green Fig 2 82 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 success fully calibrate If the computer were to display a value with a new sensor it would be a meaningless value without calibration Fig 2 83 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 translates to a range of 30 to 70 as valid mV readings in 9896 oxygen The computer will refuse to calibrate outside that range Fig 2 84 Three sensors all showing FAIL is usually caused by an accidental cali bration in air A failed calibration can only be fixed by performing a suc cessful calibration Fig 2 85 Fig 2 82 Fig
53. ows the state of the breathing loop but not what is currently being breathed Fig 2 12 Fig 2 13 Fig 2 14 aa FRACTION INSPIRED FiO The fraction of the breathing gas composed of O This value is independent of pressure Fig 2 15 ASCENT BAR GRAPH Imperial Shows 1 bar for every 10 feet per minute fpm of ascent rate Metric Shows 1 bar for every 3 meters per minute mpm of ascent rate Green when 1 to 3 bars Fig 2 16 Yellow when 4 to 5 bars Fig 2 17 and Flashes Red when 6 bars or more Fig 2 18 BATTERY SYMBOL When the battery is good the battery symbol does not display Displays Yellow when the battery needs to be changed Fig 2 19 Flashes Red when the battery is dangerously low and must be replaced immediately Fig 2 20 DEPTH Shows the depth in the currently selected units feet or meters Meters are displayed with 1 decimal place up to 99 9 meters Feet are never displayed with a decimal place Fig 2 27 If the depth shows a Flashing Red zero then the depth sensor needs service Fig 2 22 DIVE TIME The length of the current dive in minutes Does not display when not diving Fig 2 23 STOP DEPTH AND TIME Stop the next stop depth in the currently selected units feet or meters Time the time in minutes to hold the stop Fig 2 24 Stop and time will Flash Red when you ascend shallower than the current stop Fig 2 25 12 Fig 2 15 Fig
54. rated when your tissue compartments are only 10 of the way between ambient pressure and B hlmann s M value rather than 3096 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 about deep stops and Understanding M values available on the web 21 VPM B GFS EXPLAINED The VPM B algorithm requires an activation code which can be purchased at additional expense To activate the VPM B decompression algorithm contact your Hollis Dealer 100 The VPM B GFS profile limits the gradient to 90 extending the shallow stops Buhlmann Gradient exceeds 90 on this VPM B profile 150 4 200 4 VPM B Profile ft VPM B GFS Profile ft Buhlmann Gradient
55. requirements JOoLL S mn HOLLISGEAR COM
56. sions and install the new Desktop G 2E If Dive Computer menu item is greyed out the PC cannot find a Blue 59 tooth device plugged into it Fig 2 136 M II If you cannot connect to either update firmware or download dive log Fig 2 137 then you need to ensure that Bluetooth is working on your PC or laptop Fig 2 137 Once you can access dive computer run the program and select Up date Firmware from the Dive Computer Menu Fig 2 138 Select the PRISM 2 AES file that is with the document Fig 2 138 Now on the Wrist Display go to the Dive Log menu and select Upload Log Fig 2 139 2 140 Fig 2 139 Fig 2 140 42 The Wrist Display screen will switch from Initializing Fig 2 141 to Wait PC Fig 2 142 which will have a countdown Now go back to the Shearwater Desktop Fig 2 143 Click start from Fig 2 141 the open Update Firmware Box Fig 2 144 or Download Log Fig i n mE The PC will then connect to the Wrist Display and send the new firmware Fig 2 142 Fig 2 143 Predator V15 aes B BEEN Connecting to dive computer Fig 2 144 Predator V15 aes h Fig 2 145 43 The Wrist Display screen will give percentile updates of receiving the firm ware Fig 2 146 then the PC will read Firmware successfully sent to the computer Fig 2 147 The Wrist Display w
57. situation is usually resolved by increasing 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 Fig 2 188 There is no way to know the actual PPO and the average PPO will be calculated as 0 00 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 2 189 Fig 2 186 Fig 2 187 Fig 2 188 Fig 2 189 ae 58 The FAST ASCENT alarm is 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 Fig 2 190 This alarm may return after being dismissed if the condition occurs again The MISSED STOP alarm occurs when the diver has been above the minimum depth for a decompression stop for more than one minute Fig 2 191 This alarm will only appear once during a dive but it will also appear once on the surface after the dive The TISSUES CLEARED alarm will show every time the computer loses power Fig 2 192 All decompression information has been lost The WATCHDOG RESET alarm happens when the computer does not complete all of its tasks in the time allotted Fig 2 193 It can happen oc
58. tery ONLY USE SAFT 1514500 3 6V Lithium 2250mAh AA Size e Battery Operating Life Display Medium Brightness 100 Hours Plus 1 Year Standby Wrist Display Do not tighten or remove the faceplate screws Service of the Wrist Display may only be done by a Hollis authorized service center WARNING There are no user serviceable parts inside the 61 GLOSSARY OF TERMS Absorbent chemical media used to remove CO from exhaled gas Bailout redundant gas supply system BOV bail out valve Breathing Loop parts of the rebreather that breathing gas circulates within CCR CC closed circuit rebreather Diluent a gas used for breathing volume and to reduce the fraction of oxygen in the Breathing Loop DSV dive surface valve fraction of oxygen HP high pressure IP intermediate pressure LP low pressure OC open circuit PPO PO partial pressure of oxygen 62 NOTES OUR HISTORY Bob Hollis had his first rebreather experiences in the mid 60 s He used Draeger units to allow him to get close to Sea Otters and other marine life in Monterey Bay In 1970 Hollis made some of the first dives on the Electrolung rebreather using Heliox down to 300 feet in Honduras and Bonaire filming shipwrecks and deep reefs In 1990 Bob amp Oceanic developed the Phibian rebreather which at the time was the only commercially available unit HOLLIS REBREATHER DEALER SUPPORT COMMITMENT As aconsumer you will recei
59. tion is Date which allows the user to set the current date Fig 2 173 The date will have to be re entered after a battery change TIME The next System Setup changeable option is Time which allows the user to set the current time Fig 2 174 The time will have to be re entered after a battery change UNLOCK CODE The next System Setup changeable option is Unlock which allows the user to enter in an unlock in order to change models and to set other features Fig 2 175 2 176 LOAD UPGRADE The next System Setup changeable option is Load Upgrade which al lows for the user download version upgrades Fig 2 177 The documentation on how to use the Load Upgrade option can 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 all user changed options to factory settings and clear the tissues on the Wrist Display Reset to Defaults cannot be reversed Fig 2 178 NOTE This will not delete dive logs or reset dive log numbers Fig 2 173 Fig 2 174 Fig 2 175 Fig 2 176 Fig 2 177 Fig 2 178 53 54 ADVANCED CONFIGURATION MENUS 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
60. utomatic 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 appropriate depth The same is true for OC Itis always con figured correctly if you actually have the gases you have created If it is necessary to switch to OC while diving 3 button pushes will do it Fig 2 66 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 differ ent from your diluent gas list but all of the OC gases are automatically selected and available Now switch back to closed circuit and start the dive Fig 2 67 We have reached a depth now that will incur decompression soon Fig 2 68 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 2 69 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 fom now during the 7 minute ascent the diver ascended slower t
61. ve a greater level of support from a Hollis Rebreather Dealer Not because a non Rebreather dealer doesn t care about support Instead the Hollis Rebreather Dealer has a greater level of commitment to the complete product line A Hollis Rebreather Dealer has perfected their diving skills and is at their peak of instruction They will provide access to rebreather training service consumables upgrades and travel The view from a Hollis rebreather into the underwater realm is like a view from no other place on earth Hollis Gear promises to deliver an experience like no other In 2000 Hollis parent company American Underwater Products under two separate contracts with the United States Naval Surface Warfare Command developed and delivered a unit called the ATUBA Advanced Tactical Underwater Breathing Apparatus This solid background of rebreather technology has led to the development of the Prism 2 AMERICAN UNDERWATER PRODUCTS ENVIRONMENTAL QUALITY POLICY American Underwater Products is committed to the preservation of our oceans and supports outreach and awareness programs that develop an understanding of the oceans importance to life on earth the fragility of marine ecosystems the damage done by pollution and the threat of overfishing We produce innovative products of the highest quality manufactured in an environmentally sustainable manner that meets or exceeds our customer s expectations and regulatory
62. witch back to the High Setpoint upon another descent past 60 ft 12 1 m during the same dive The setpoint switch must then be made manually throughout the dive despite any Auto Setpoint Switch settings descent and initial ascent Returning to a previous depth will not trigger another down or up switch If another up or down switch is required in the same dive it will need to be done manually WARNING The Auto Setpoint switch only occurs on initial Fig 2 160 Fig 2 161 Fig 2 162 Fig 2 163 Fig 2 164 Fig 2 165 The final option is still a part of the switch down function and enables the editing of the switch depth Fig 2 766 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 from 2 999 meters If you enter a setting that is outside the allowed range the existing valid setting is retained with no change Fig 2 166 oT DISPLAY SETUP 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 Fig 2 167 2 168 BRIGHTNESS RANGE The next Display Setup changeable option is Brightness which allows the computer to switch between four brightness settings Auto Low Medium and High Fig
63. xygen SELECT will bring up the confirmation display Fig 2 58 and another SELECT will calibrate Fig 2 59 Fig 2 58 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 2 60 The first CC gas that is available will display Fig 2 61 Fig 2 59 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 con figured We SELECT gas number 2 Trimix 10 50 Fig 2 62 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 Fig 2 60 assume that you have switched to an air diluent at 124 feet This is only for TTS The computer will always use the currently selected gas for tis sue loading calculations Then we switch to open circuit to look at our bail out gases Flipping through the gases with MENU shows that we have three gases available Fig 2 63 2 65 Fig 2 61 Whether they are appropriate gases is a subject for one of the web fo rums Fig 2 62 Fig 2 63 Fig 2 64 Fig 2 65 2 24 These are the gases that will be used to estimate TTS in the event that you switch to open circuit 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 A

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