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Poseidon MkVI User Manual

1. Figure 1 22 Closeup of hose connection Figure 1 23 Push hose connector into receiver until outer flange Is flush with start of threads Figure 1 24 Hand tighten the swivel capture nut Do NOT use tools or over tighten First select two hoses to be used as the rear left and right breathing hoses Figure 1 21 Insert the end of one of the hoses into the left inhalation threaded breathing manifold Figures 1 22 and 1 23 Pay particular attention to the condition of the radial o ring on the end of the hose and to the radial sealing surface inside the lip of the threaded breathing manifold The o ring O ring groove and sealing surface at the hose junction must all be clean and free of all debris free of scratches and gouges and properly lubricated before assembly Be sure when inserting the hose end into the threaded breathing manifold that the radial o ring does not extrude from its circular groove The radial o ring in the hose end should insert smoothly into the radial sealing surface Figure 1 22 until it is no longer visible and the top rim of the hose end is flush with the ledge just above the threads on the manifold See Figure 1 23 Once the hose fitting is properly inserted Figure 1 23 slide down and hand tighten the hose swivel nut Figure 1 24 Make sure that the threads are properly engaged and are not cross threaded The fittings are designed for ease of assembly and the capture nut should freely rotate until
2. Figure 1 34 show how to connect the oxygen regulator to the oxygen cylinder valve Both the cylinder fitting and the regulator fitting and o ring should be carefully inspected for signs of organic debris grease oil and hydrocarbons If the regulator o ring is damaged gouged scratched or otherwise worn or cut replace it with an appropriate Poseidon oxygen cleaned o ring The oxygen cylinder valve for European users is an M26x2 female DIN thread This is larger than the G 5 8 DIN thread that is commonly used in both the United States and in Europe for compressed air Scuba The purpose of using different threads is to make it absolutely clear that the oxygen delivery system is different from the diluent delivery system Accidental con nection and use of diluent through the oxygen regulator can be considered a compromise of the oxygen cleaning requirements If contamination occurs the compromised components should be taken to an authorized Poseidon Tech Center representative or a qualified tech dive shop technician for oxygen cleaning POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 24 DANGER All components exposed to pressurized oxygen including the oxygen cylinder valve and regulator must remain free of hydrocarbons grease oil gasoline etc and other organic compounds Never expose these components to compressed air which can contaminate components with oil Always have these components cleaned and serviced by a Poseidon Tech Cen
3. of the MkVI is the location furthest behind the diver s back when wearing the rig normally Following is a brief description of each of the major components Primary display The Poseidon MkVI is equipped with a custom glass liquid crystal display LCD with large bright crisp letters for easy reading at a glance underwater It is designed specifically for recreational divers and presents only the informa tion needed for safe operation It includes an automatic high efficiency back light that illuminates the panel when ambient light levels are low It also includes an infrared data port which allows communication with a PC for dive log downloading parameter setting and software upgrades Two wet switch contacts on the back of the display activate the MkVI electronics Figure 1 1 Front view of assembled Poseidon MkVI Right rear breathing hose Right side exhalation counterlung Right side water diversion manifold Right front breathing hose Counterlung Over Pressurization Valve OPV dr Jetstream Octopus Closed circuit open circuit convertible mouthpiece CHAPTER 1 PAGE 1 Fe j D rie T v i Ie ER Left rear breathing hose Left side inhalation counterlung Left side water diversion manifold Left front breathing hose Auto diluent addition valve ADV Primary display Head up display HUD POSEIDON MKVI USER MANUAL Open circuit
4. One of the important new features in the Poseidon MkVI is the Hyperoxic Linearity test When the oxygen sensors are calibrated during the pre dive routine Chapter 2 the linearity of the oxygen sensor response is only validated up to a PO value of 1 0 bar atm i e 100 oxygen at sea level Most rebreathers assume that the sensor response remains linear at higher values operational PO setpoint values often exceed 1 0 bar atm However in certain situations the sensors may not be linear above 1 0 bar atm which can lead to a very dangerous situation For example if the sensor is not capable of responding to PO values greater than 1 2 bar atm and the PO setpoint is 1 2 bar atm the control system may flood the breathing loop with dangerously high levels of oxygen while attempting to achieve a PO value that the sensors are not capable of registering To overcome this problem the Poseidon MkVI performs a test on the primary oxygen sensor the first time a depth of 6 m 20 ft is achieved The test injects a short burst of oxygen directly onto the primary sensor to ensure the sensor response is linear up to a PO value of 1 6 bar atm If the test passes then the dynamic setpoint performs as described previously e using up to the deep PO setpoint value when the depth exceeds 15 m 50 ft However if the Hyperoxic Linearity test fails then the maximum allowable setpoint is set at 1 0 bar atm The reason for this is that th
5. 2 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test continues to fail attempt to reinstall Firmware may cause unrecoverable failure 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test continues to fail reset system parameters 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test continues to fail attempt to reinstall Firmware may cause unrecoverable failure 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test continues to fail try a different battery 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists or if backlight does not turn on during this test contact an authorized Poseidon Service Center for repair POSEIDON MKVI TH TIME SEC 18 20 22 24 Zo 26 2 4 5 4 5 4 5 USER MANUAL DESCRIPTION HUD LED This test measures the amount of electrical current consumed by the red LED in the Head Up Display HUD when activated Buddy Light LED This test measures the amount of electrical current consumed by the red LED in the battery
6. 3 If test failure persists contact an authorized Poseidon Service Center for repair Breathing hoses can only be re attached to the end fi ttings by a qualified Poseidon Service Center Do NOT attempt to re attach the fi tting without understanding the correct procedure for doing so An incorrectly attached fitting may appear to be conneted properly can easily and suddenly detach underwater leading to a fl ooded breathing loop 1 Do NOT attempt to dive with a cracked absorbent cartridge If gas leaks through the cartridge wall CO may bypass the absorbent material and enter the inhalation side of the breathing loop which can cause CO2 poisining Always replace a cracked cartridge with a new one Use the various adjustable straps on the counterlungs to secure them in the proper position see Chapter 3 of this Manual It may take several attempts in a pool or other confi ned body of water to get them just right but the effort is well worth it Well positioned counterlungs reduce the work of breathing Loosen the cylinder cam straps on one of the two cylinders and carfeuly adjust its height such that both cylinders are the same height When the cylinders are mounted properly the unit should stand upright without wobbling 1 Ensure all fi ttings are snuggly attached 2 Remove the hose from the leaking fitting to inspect the o ring and sealing surfaces for signs of damage and clean or replace o rings as needed 3 If leaking persists co
7. Pressure Dry in accordance with EN14143 With the nuts loose pull the webbing handle on the bottom of the housing in a fashion so that it moves in the opposite direction from the electronics housing Because o ring seals can set with time it may be necessary to restrain the tube with one hand while pulling with the other see Figure 1 49 Make sure that the nuts are completely free from the heli coils before pulling out the bottom lid Once the dual radial seals on the end cap have cleared the end of the housing tube the CO absorbent cartridge will freely slide out as shown in Figure 1 50 SofnoDive 797 Pre pack CO absorbent Cartridge Figure 1 47 The CO absorbent cartridge with the SofnoDive 797 Pre pack CO absorbent Cartridge inside POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 31 WARNING The CO absorbent cartridge is intended for use with a single fill of the standard 3 liter oxygen cylinder provided with the Poseidon MkVI The cartridge MUST be replaced whenever the oxygen cylinder is re filled When in doubt discard the cartridge and replace it with a fresh one Base plate nut x 4 Cartridge end cap Figure 1 51 Figure 1 52 Figure 1 53 Remove the cartridge Remove the end plate Lift and remove the lower sponge top plate inspect for collected water Rinse dry and store the lower sponge disinfect if desired The sponge should be dried after every dive even if a repetitive dive is p
8. The test number is displayed on the left side of the screen preceeded by a lower case t as shown in Figure 2 5 While the test is running a spinning wheel is displayed on the right side of the display where the remaining dive time is normally displayed This spinning wheel is represented by a O character in the right most POSEIDON MKVI USER MANUAL position missing one of the segments The missing segment rotates positions around the 0 in a clockwise direction Different tests require different amounts of time to complete some require less than one second others require 4 12 seconds to complete Certain tests that involve some action by the diver allow for up to 2 minutes to complete if necessary ka 4 Ki mg Figure 2 6 Test 17 failure with flashing test number and error code DA Figure 2 5 Jest 17 Backlight Power consumption displaying test number on the left and the spinning wheel on the right Two things are worth noting in Figure 2 5 First the bar graph along the top of the LCD screen is a progress bar indicating how much time remains before the PST is complete or how much time is left for the diver to complete some required action Second the circle with the diagonal line through it in the upper right corner of the screen is the Do Not Dive symbol which is displayed throughout the entire pre dive process As long as this symbol is displayed the dive shoul
9. contact an authorized Poseidon Service Center for repair 1 Ensure the oxygen cylinder is connected to the oxygen regulator and that the valve is turned on 2 Ensure that the oxygen cylinder contains sufficient oressure 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Ensure the diluent cylinder is connected to the diluent regulator and that the valve is turned on 2 Ensure that the diluent cylinder contains sufficient oressure 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test continues to fail subject battery to a Learn Cycle on the charger see Chapter 1 3 If test continues to fail try a different battery subject to decompression data issues 4 If test failure persists contact an authorized Poseidon Service Center for repair POSEIDON MKVI TH Time SEC 49 5O 53 120 120 120 USER MANUAL DESCRIPTION Positive Pressure Loop Test Besides checking for leaks in the breathing loop this test checks several additional things including leaks in any of the four solenoid valves that gas actually passes through each of the two metabolic solenoid valves that the dump valve on the right counterlung is secured and that the depth sensor Is sensitive to small pressue changes Because there are several things being checked during this test there are also several different kinds of failures with differ
10. go through the Pre Dive checklist located on the sticker placed on the back side of the primary display The Pre Dive checklist is also located in chapter 2 on page 46 POSEIDON MKVI USER MANUAL Servicing Poseidon MkVI cylinders should be hydro tested once every five years and visually inspected yearly Regulators should be rebuilt every two years Oxygen regulators cylinders and cylinder valves should be oxygen cleaned every two years All of these services form a part of the Poseidon Tech Center biannual service Contact your Poseidon representative for details We recommend that you pay close attention to the primary display at test 55 during the pre dive check At this test the remaining number of weeks until the next scheduled service date is displayed Once the service date is due the diver is prompted to acknowledge similar to power up proce dure that he she has understood that service is needed A grace period of 4 weeks is added WARNING It is recommended practice to don the rebreather unit only after completion of the Pre Dive Procedures described in the next Chapter Not only is it easier to diagnose and correct many test fails when the rig is not on the diver s back but also the risk of oxygen fire is greatest when cylinders are pressurized which is usually done during the Pre Dive Procedures CHAPTER 1 PAGE 36 Figure 1 63 Ready for Pre Dive tests As configured in this photo the Poseidon MkVI
11. graph will flash The full scale 100 value of each of these bar graphs is established using the PC Software Do NOT ignore the remaining battery life indicator If the battery fails the entire life support system including alarms may cease to function Failure to abort to open circuit and terminate the dive could lead to serious injury or death Figure 3 31 Diluent cylindepressure indicator Figure 3 32 Oxygen cylinder pressure indicator Temperature Immediately to the left of the Battery Life Indicator is the Temperature reading This value is displayed in units of centigrade when in metric mode and units of fahrenheit when in imperial mode NOTE These numbers will show the last two decimals of the PO value if it has been set to High Res in the PC Config tool Figure 3 30 Temperature Ascent rate indicator The bar graph along the very top of the Primary Display indicates the divers current ascent rate It soans from left to right and is not dis played when the diver is not ascending If the bar is half way across the width of the screen the diver is ascending at a rate of 9 m 29 5 ft per minute If the status bar is shown across the entire width of the screen the diver is ascending at arate of 18 m 59 0 ft per minute The segments in this graph will flash if the safe Figure 3 33 Ascent rate indicator ascent rate 10 m 33 ft per minute is exceeded POSEIDON MKVI USER MANUAL S
12. 2 If test continues to fail reset system parameters HUD Head Up Display which contains user selectable con EEPROM 3 If test failure persists contact an authorized Poseidon Service Center for figuration information for internal errors or data corruption repair 6 5 Backpack ROM RAM Fuses This tests the RAM ROM and 4 Bad RAM 1 Standard Response 2 If test failure persists contact an authorized fuse settings of the electronics in the backpack processor 5 Bad Fuse Poseidon Service Center for repair The RAM is tested only when the battery is inserted and the results used for all subsequent power up routines Other tests 3 Bad ROM 1 Standard Response 2 If test continues to fail attempt to reinstall are conducted on each power up routine Firmware may cause unrecoverable failure 3 If test failure persists contact an authorized Poseidon Service Center for repair POSEIDON MKVI TH Time SEC 7 14 15 16 17 1 USER MANUAL DESCRIPTION Backpack EEPROM This tests the EEPROM static memory in the backpack processor which contains user selectable configuration information for internal errors or data corruption Battery ROM RAM Fuses This tests the RAM ROM and fuse settings of the electronics in the battery processor The RAM is tested only by the factory or when new firmware is installed and the results used for all subsequent power up routines Other tests are conducted on each power up routi
13. Before the dive make sure there is enough diluent air and oxygen to carry out the dive you plan to do The EU version of the Poseidon MkVI comes with a 3 liter 183 cubic inch aluminum diluent air cylinder with black valve knob with a rated fill pressure of 204 bar 2958 psi Filled to its maximum allowed working pressure it holds 612 liter 21 6 cubic feet of air Because this cylinder is your open circuit OC bailout gas in the event of an emergency Poseidon strongly recommends that this cylinder be full at the start of each dive The included oxygen cylinder white valve knob has the same capacity and pressure rating as the diluent cylinder but the recommended maximum filling pressure of oxygen is limited to 135 bar 2000 psi for reasons of fire safety Attach both the diluent and oxygen cylinders using the procedures described in Chapter 1 Do not turn the cylinders valves on initially as this will result in wasted gas during certain portions of the pre dive tests As described below the cylinders should be turned on when the pre dive checks reach Test number 44 and 45 The pre dive tests will fail if the pressure in the diluent cylinder is less than 51 bar 739psi or the oxygen cylinder is less than 34 bar 493 psi Similarly if starting a dive with only a marginal amount of gas above these minimum safety limits these gas pressure limits will be reached soon after the start of the dive leading to an unsatisfying diving experie
14. Breathing hoses properly connected to the mouthpiece CHAPTER 1 PAGE 28 The final step in assembling the breathing loop is the convertible open circuit closed circuit mouthpiece Figure 1 45 shows the bottom half of the mouthpiece and the two closed circuit CC hose connections Each CC connection contains within it a removable flow checkvalve and o ring sealed carrier plate These checkvalves constrain the direction of the breathing gas from left to right The left CC entry port into the mouthpiece is the upstream or inhalation port and the right CC entry port is the downstream or exhalation port Figure 1 45 shows a close up view of the downstream CC checkvalve It should be free of debris and should lie smooth and uniformly flat against its removable carrier plate If there is any curling cuts gouges or other damage to the checkvalve remove the carrier plate and replace the check valve only with a Poseidon original manufacture mouthpiece checkvalve Attach the right hand front breathing hose to the downstream CC port as shown in Figure 1 45 following the proce dures previously described Inhalation left CC port Inhalation close circurit checkvalve Exhalation right CC port Exhalation close ee di checkvalve Figure 1 45 msbdki the inhalation CC and exhalation CC checkvalve on the mouthpiece Attach the front breathing hoses to the inhalation VS and exhalation OC ports on
15. Module around the braided 90 cm hose and attach the HUD to the moutpiece and make sure it is properly secured See Figure 1 38 and 1 39 Diluent 1st stage IP port E Gong braided 90cm Low Pressure hose Long braided 90 cm Low Pressure hose 9 16 connection Figure 1 39 Figure 1 37 Connect the long braided 90 cm Low Pressure hose to the Connect the long braided 90 cm Low Pressure hose to the diluent 1st stage IP port mouthpiece and attach the HUD to the mouthpiece POSEIDON MKVI USER MANUAL 10 Jetstream Octopus The Poseidon MkVI is delivered with an alternative air source i e Octopus that should be connected to the diluent 1st stage To fully understand the funktions ofthe Jetstream NS please read the Jetstream Octopus manual WG CH A Figure 1 40 i The alternative air source i e Octopus should be connected to the diluent 1st stage and the LP hose should be routed in such way that it allows easy access to the alternative air source in case of an emergency situation CHAPTER 1 PAGE 26 Figure 1 41 Connect the alternative air source low pressure hose to a low pressure port marked IP on the diluent black connection wheel 1st stage POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 27 11 Front CC hoses to counter lung T section Connect the left front CC loop hose to the inhalation counter lugn T connection Lay out the two remaining breathing hoses Connect the right front breathi
16. O When the displayed value is the PO Setpoint the first digit to the left of the decimal is shown using only the upper half of the numeric value Figure 3 14 PO Set point value Figure 3 15 Real PO value The Poseidon MkVI incorporates a dynamic PO setpoint value which means the setpoint changes depending on depth and decompression status Two setpoint settings control what the range of setpoint values will be during the dive A surface setpoint value default 0 5 bar atm establishes the PO setpoint when at the surface and a deep setpoint default 1 2 bar atm establishes the PO setpoint when at a depth greater than of 15 m 50 feet Between these two depths the setpoint changes in small increments between these two values Thus when the depth is less than 15 m 50 ft the setpoint will be some value between the surface setpoint and the deep setpoint proportional but not linearly so to current depth This dynamic setpoint method helps prevent excessive PO spikes during descent and excessive oxygen wastage during ascents from no decompression dives There are two exceptions to the dynamic setpoint method described above The first is that whenever a decompression ceiling exists the setpoint will not drop below 0 9 bar atm during ascent The second involves the Hyperoxic Linearity test on the primary oxygen sensor as described below CHAPTER 3 PAGE 52 Hyperoxic linearity test
17. adequate substitute for training from a qualified Poseidon MkVI instructor Failure to obtain proper training prior to using the Poseidon dall could lead to serious injury or death Monitoring alarms The most important responsibility of anyone diving the Poseidon MkVI is to monitor the alarm systems There are three separate alarm systems the Head Up Display HUD located on the mouthpiece the battery module located on the main electronics module behind the diver s head and the Primary Display Each of these systems is intended to get the attention of the diver or the diver s companions through visual audio and tactile signals and convey clear information to the diver concerning the status of the MkVI DANGER NEVER ignore or otherwise discount any of the alarm signals on the Poseidon MkVI Failure to respond appropriately to any of the alarm signals could lead to serious injury or death HUD vibrator Perhaps the most important alarm signal on the Poseidon MkVI is a customized version of the patented Juergensen Marine DIVATM vibrator system located in the HUD mounted on the mouthpiece There are two ways this tactile alarm may be triggered The first and by far the most important alarm is a continuous pulsing vibration signal On Off On Off etc This signal has one and only one meaning Change the Mouthpiece Valve position NOW In most cases this signal will be triggered in association with an open circuit
18. breathing gas and to direct the flow to the gas processing unit in the backpack One way checkvalves in the mouthpiece direct the exhaled gas such that it moves from the mouthpiece to the right front exhalation breathing hose into the right water diversion manifold and into the right counterlung During normal use water will sometimes collect in both of the front breathing hoses but predominantly it will collect in the right front exhalation breathing hose The right side water diversion manifold directs the water into the right counterlung while the breathing gas continues through the loop towards the CO absorbent cartridge At the bottom of the right counterlung is a variable tension dump valve that can be used to vent the water periodically during the course of a dive The counterlungs left and right are each sized to be about half the volume of a full breath for an average individual This design known as a dual over the shoulder counterlungs optimizes the ease of breathing underwater Those familiar with open circuit diving will notice an immediate improvement in diving comfort when using the Poseidon MkVI because of this design POSEIDON MKVI USER MANUAL Carbon dioxide absorbent cartridge At the heart of all reoreathers is the requirement to remove the metabolically generated carbon dioxide CO from the breathing loop and replace the oxygen consumed through metabolism The Poseidon MkVI is designed around a mod
19. closed circuit mouthpiece One of the most amazing of several technology breakthroughs in the Poseidon MkVI is its switch able mouthpiece It incorporates a high performance lightweight open circuit regulator and you can breathe it just that way just like standard scuba With a simple quarter turn of an easy to operate switch the system is ready for fully closed circuit bubble free silent depth independent diving Automatic diluent addition valve ADV The mouthpiece also contains a patented system that integrates an automatic diluent addition valve ADV which compensates for depth related compression of the counterlung breathing volume during descents This ensures a full breath automatically allowing for hands free descents The Poseidon MkVI incorporates this into the mouthpiece with a special mechanism that adjusts the trigger tension on the open circuit second stage when diving in closed circuit mode so that gas is only added when the counterlung volume is insufficient to provide a full breath on inhalation Figure 1 2 HUD with red LED on Heads up display HUD The mouthpiece also includes a snap in place head up display HUD The HUD contains its own computer processor that communicates with other system processors via the network and includes both a high intensity red LED to alert the diver of a potential problem Figure 1 2 and a patented Juergensen Marine vibration system that provides a tactile alarm system to adv
20. flash for five seconds unless the wet switch is activated It is important to note BOTH the test number left side of the display and the error code number right side of the display because both of these values are needed to identify the likely cause of the problem and in some cases determine the best course of action to correct the problem Figure A1 1 Jest 17 Backlight Power consumption displaying test number on the left and the spinning wheel on the right Figure A1 2 Test 17 failure with flashing test number and error code POSEIDON MKVI USER MANUAL Technically an error code of 1 means that the test passed successfully However this should never be displayed because as soon as a test passes the routine continues on to the next test An error code of O means that the test did not complete within the alloted time For tests requiring action by the user t43 t45 t50 this usually happens when the action was not performed within the time allowed For the other tests error code O is the result of a failure of a processor to respond in time such as from a network failure which in many cases can be solved with the standard response as described below Standard response to test failure The first thing to do when any of the automatic pre dive tests fail is make sure that the battery is adequately charged and that it does not require a learn cycle A low battery may cause one or more of the test
21. followed by a stream of gas bubbles After the water has been flushed the loop vent valve can be tightened by rotating clockwise and the breathing loop volume and PO can be restored to normal A small amount of condensation may also collect in the inhalation portion of the breathing loop between the CO absorbent cartridge and the mouthpiece Normally this will only be a small volume of water and most will be absorbed by sponge trap POSEIDON MKVI USER MANUAL CHAPTER 3 PAGE 60 Managing ascents During an ascent from a rebreather dive the oxygen partial pressure in the loop will begin to drop due to the dropping ambient pressure The oxygen control system will likely begin to compensate for this by injecting oxygen however during somewhat faster ascents the solenoid valve may not be able to keep up with the drop in loop PO caused by the drop in ambient pressure This is not of great concern unless the PO gets so low that it triggers alarm conditions but it represents one more reason why it s always good practice to ascend at a slow and controlled rate During the ascent loop gas will be vented from the breathing loop due to expansion For this reason dives involving many ascents and descents up and down can lead to excessive loss of both diluent during descents in re filling the breathing loop and oxygen during ascents while trying to maintain the set point Ending the dive After surfacing and exiting the water t
22. for a dive to be started at least 25 of maximum capacity Sufficient Battery Capacity This test ensures that the battery has a sufficient charge to start a dive The minimum necessary charge depends on how long it has been both in terms of time and number of charge cycles since the last Learn Cycle see Chapter 1 If 160 days have elapsed since the last Learn Cycle this test will always fail ERROR GODE 35 Bad Batt Deco data 36 Bad Rig Deco data 37 Ser Num Mismatch 38 Time Mismatch 39 No Deco data O Timeout O Timeout O Timeout 5 Charge Insufficient APPENDIX PAGE 75 SOLUTION The most common cause of failure of this test is inserting a battery from one user into the rig of another user In such cases the decompression data will not match The first automatic pre dive routine to encounter this condition will fail alerting the diver to the mis matched data The next time the electronics are booted this test should pass and the system will assume the worst case set of decompression data among the two disparate sets 1 Standard Response 2 If test failure persists contact an authorized Poseidon Service Center for repair 1 Ensure that the moutpiece is fully in the OC position sometimes requires firm pressing on the mouthpiece lever 2 Ensure that the HUD is properly positioned on the top of the mouthpiece and that the exhaust cover is holding it tightly in place 3 If test failure persists
23. if the sponge isn t completely dry to minimize the chance of replacing the wrong CO absorbent cartridge After each day of diving Open the breathing loop At the end of each diving day it is important to open up the breathing loop to allow the hoses and other components to dry overnight This is by far the best procedure for keeping the inside of the breathing loop clean All four breathing hoses should be removed from their attachment points mouthpiece shoul der ports and main housing and placed such that water inside will drain out and somewhere with relatively dry well circulated air Remove the shoulder ports from the counterlungs and store them where they will dry and will be protected from accidental damage Remove the counterlungs from the harness and if possible hang them such that water will drain from them through the Shoulder Port connec tion sockets Remove the CO absorbent cartridge and the two sponge water traps Discard the absorbent cartridge properly and squeeze out the sponges and place them where they will be allowed to dry Store the electronics After removing the regulators from the oxygen and diluent cylinders remove the electronics module and place the entire electronics oneumatics assembly where it will be able to dry Do not attempt to disconnect the regulators from the electronics module or disconnect the mouthpiece from the supply hose It is best to keep the entire electronics oneumatics as
24. obligation i e the Decompression Ceiling Alert is displayed and the diver then ascends above the depth at which the Decom pression Stop Alert is displayed the down arrow will flash In this situation simply descend gradually until the down arrow no longer flashes and remain at that depth until the Decom pression Stop Alert no longer displays POSEIDON MKVI USER MANUAL Battery life indicator Near the bottom of the Primary Display just to the left of the Elapsed Dive Time value is the Battery Life Indicator This indicator serves as a fuel gauge for remaining battery life If the remaining battery life is less than 20 this indi cator will flash and the screen will indicate that the dive should be terminated The more time that has elapsed since the last battery Learn Cycle the greater percentage of battery charge is needed to ensure 20 remaining power DANGER Figure 3 29 Battery life indicator CHAPTER 3 PAGE 56 Cylinder pressure indicators Along either side of the Primary Display are the two cylinder pressure indicators represented as bar graphs The graph on the left side of the screen is for the diluent supply and the graph on the right side of the screen is for the oxygen supply Each segment in the bars represents approximately 10 of the total gas supply for each cylinder When the pressure in either cylinder drops below the minimum acceptable value the remaining segments of the corresponding bar
25. oxygen clean systems gas banks and compressors are already handled by those centers and all you need to do is present your cylinders for filling For those with less convenient access to such facilities there are several practical consider ations It may be worthwhile to acquire several spare Poseidon MkVI oxygen cylinders and have those pre filled for future dives when needed If you will be visiting a dive resort or live aboard boat inquire ahead as to the availability of oxygen and or the availability of pre charged cylinders on site that are compatible with the MkVI Note that the MkVI oxygen cylinders sold in Europe contain a DIN M26x2 thread This is larger than the G 5 8 DIN thread that is more standard around the world Poseidon sells oxygen cleaned converters that will allow filling of the M26x2 oxygen cylinder from a standard G 5 8 male DIN fitting POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 12 Part 2 Assembly Before you start assembling your Poseidon MkVI eCCR you should perform the following preparations e Make sure you have a scrubber that will last your planned dive s e Fill your diluent tank with the correct gas e Fill your oxygen tank with the correct gas e Make sure your battery is charged and that a learn cycle has been performed within the last 30 days e Make sure you have all parts and that they are without damage e Lubricate all o rings that you can access Please note that the Besea harness a
26. rer ee EE 71 POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE IV Conventions used in this guide This User s Guide is NOT intended for use as a training manual or in any way as a Text photographs and figures copyright 2008 2011 substitute for proper training through a legitimate training agency approved by Poseidon AB It is only intended to provide basic information concerning the Poseidon pace A ALL RIGHTS RESERVED Throughout this Guide special alert boxes have been inserted to draw attention to critical information Three levels of alerts are used in conjunction with color coded triangle symbols as follows by Poseidon Diving Systems AB Manual Version 2 2 December 2011 No part of this book may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying recording or by any information storage retrieval system without permission in writing from an authorized representative of Poseidon Diving Systems AB WARNING Alert boxes that are YELLOW contain vital information that may impact a diver s safety and or proper function of the Poseidon MkVI Though generally not life threatening information contained in these boxes should not be ignored POSEIDON MKVI USER MANUAL Preface Congratulations on your decision to purchase the Poseidon MkVI Closed Circuit Rebreather CCR The Poseidon MkVI design includes several fundamental improve ments over previous closed circuit rebrea
27. routine that automatically follows power up Negative Pressure Loop Test Before powering up the electronics it is important to check the integrity of the breathing loop A positive pressure loop test is conducted later on as part of the normal power up and auto mated pre dive test procedure However it is possible that some leaks in the breathing loop will fail only when the external ambient pressure exceeds the pressure inside the breathing loop and thus will not be detected during a positive pressure loop test For this reason it is important to conduct a manually negative pressure loop test before starting a dive To conduct a manual negative pressure loop test first secure the exhalation counterlung over pressure checkvalve by tightening it inward to its full extent using a clockwise rotation when viewed standing in front of the valve and looking at the valve Place the mouthpiece switch lever to closed circuit CC position and inhale any residual gas within the breathing loop exhaling it through the nose to remove it from the breathing loop Repeat this procedure several times until you have pulled as strong a vacuum on the breathing loop as you can and then quickly switch the mouthpiece to OC position to hold the vacuum inside the breathing loop The breathing hoses will contract until no more breathing gas can be pulled from the loop CHAPTER 2 PAGE 38 With the mouthpiece in the OC position observe over a period of a minut
28. screen to see which value s is are also flashing As long as one of the other displayed values on the Primary Display is flashing the General Alert symbol will also flash Electronics alert Located between the DO NOT DIVE symbol and the General Alert symbol is a small icon that resembles a personal computer with a lightning bolt on the screen This symbol indicates that a problem has been detected with the electron ics such as a network failure an unexpected system re boot or other detected errors The specific cause is recorded in the logged data If the Electronics alert symbol is shown during a dive of after the completion of a Pre Dive test ABORT the dive or DO NOT DIVE Decompression ceiling alert In the lower center of the Alarm Signal Area is the Decompression Ceiling Alert This symbol will flash when the diver has incurred a decom pression obligation The Poseidon MkVI is not intended for decompression diving so the dive should be terminated whenever this icon is dis played The diver should ascend towards the surface at a slow and controlled rate watching the Primary Display for the Stop Alert and addi tional decompression information see below USER MANUAL Figure 3 9 General alert Figure 3 10 Electronics alert Figure 3 11 Decompression ceiling alert Figure 3 12 Stop alert CHAPTER 3 PAGE 51 Stop alert The octagonal shape with a flat palm in the center located between the ABOR
29. shows the optional Platform backpack installed but not the optional buoyancy compensator wing which is mounted behind the counterlungs POSEIDON MKVI USER MANUAL CHAPTER 2 PAGE 37 Chapter 2 Pre dive procedures The Poseidon MkVI is a compact and very powerful life support system that offers an unprecedented new experience in recreational diving But it is also a complex assembly of high technology that includes sensors actuators computers and software that need to operate reliably in an underwater environment for the important purpose of keeping a diver alive and healthy For the same reasons that good pilots use pre flight checklists to ensure their flying machine has a high probability of successful take off flight and landing so does the rebreather diver need to formalize the process leading up to a dive The MkVI design team has gone to extraordinary measures to automate the pre dive procedure and the operation of the rig during a dive This chapter explains the pre dive test procedures including manual actions that are required by the user and how to interpret the results of the automated tests should any of them fail to complete successfully DANGER Failure to properly and completely conduct the Pre Dive tests and to ensure that the rig is operating properly could lead to permanent injury or death Do NOT skip the Pre Dive Procedure Your life depends on it Initial Pre dive procedures Gas supply cylinders
30. t see Figure A1 1 When each test is active a spinning wheel is displayed on the right side of the display where the remaining dive time is normally displayed This spinning wheel is represented by a O character in the right most position missing one of the segments The missing segment rotates positions around the 0 in a clockwise direction The purpose of this symbol is to assure the diver that the test is still actively being conducted and the system has not locked up When a test completes successfully the next test begins automatically as represented by the increasing t number on the left side of the Prmary Display The bar graph located along the top of the display normally used as an ascent rate indicator serves as a progress bar for the test routine starting with all segments lit then eliminating segments from right to left as the test or set of tests progresses If a test fails the test number flashes and the spinning wheel indicator on the right side of the display is replaced by a flashing error code indicating what aspect of the test failed Figure A1 2 This continues for approximately five seconds after which the electronics power down if the wet switch is not activated and the system has not entered Dive Mode due to exposure to depth It is important to carefully monitor the automatic pre dive test routine in case a test fails Upon test failure the test number and error code only
31. tanks should be mounted on your left hand side Make sure that tanks are filled with the correct gases Left side Diluent Right side Oxygen Figure 1 27 The Diluent black knob tank is mounted on the unit s left hand side and the oxygen white knob is mounted on the unit s right hand side CHAPTER 1 PAGE 20 The Poseidon MkVI is equipped with one mounting bracket holding two nylon cylinder straps with cam buckles on each side Attachment of the diluent cylinder black valve handle is illus trated in Figures 1 27 and 1 28 After positioning the cylinder with the valve in the correct ori entation the strap should be pulled through the cam buckle to snug the cylinder so that it cannot rotate Figure 1 28 Maintain the tension on the strap while threading it through the end slot of the cam buckle Maintain tension while closing the cam so as not to allow any slack to pass back through the buckle then swing the cam buckle closed The cylinder should be rigidly mounted to the gas processor housing once both upper and lower straps have been oroperly attached and secured Then repeat these steps on the oxygen cylinder white valve handle Cam buckle Strap Figure 1 28 The tank bands should be tightned hard enough to prevent the tanks from rotating POSEIDON MKVI USER MANUAL 7 E module Check and make sure that the two o rigs around the e module are in place and without damage Align the e module so that the
32. the mouthpiece ON Tighten the hose nut oh the downstream CE pore Sw threads DO NOT use tools or over tighten mE POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 29 Inspect the upstream CC checkvalve It should be free of debris and should lie smooth and uniformly flat against its removable carrier plate If there is any curling cuts gouges or other damage to the checkvalve remove the carrier plate and replace the checkvalve only with a Poseidon original manufacture mouthpiece checkvalve Attach the left front breathing hose to the upstream CC port as shown in Figure 1 45 following the standard hose connection pro cedures previously described The breathing loop assembly is now complete The result should now appear as shown in Figure 1 44 WARNING Carefully inspect all breathing hose o rings when assembling the breathing loop and ensure that the fittings themselves are properly attached to the hoses Sometimes the fittings can become loose and form an imperfect seal Careless assembly can lead to poor seals and increase the risk of water entering the breathing loop during a dive DANGER Ensure that the checkvalves are inserted properly and in the correct orientation WARNING The hoses are designed to function properly in all normal diving environments However if the hoses are exposed to temperatures in excess of 70 C 158 F they may become permanently deformed and would need to be replaced POSEIDON MK
33. 1 16 attach the counterlungs to the shoulder straps of the backpack The MkVI is provided with a lower D ring and a crotch strap that connect to the bottoms of each counterlung Using this system the user can fix the counterlungs as high or low on the harness straps as desired to reduce the work of breathing Figure 1 16 Fasten the upper counterlung position with the adjustable length quick connect buckle Attach the three velcro retainer flaps to the Platform harness straps POSEIDON MKVI USER MANUAL 4 Rear CC hoses to counter lung T connections Connect the T connection to the top port in each counter lung Thread connection post Iw Figure 1 17 nsert the right hand water diversion manifold into the port on the right counterlung Locate the two counterlungs and their respective water diversion manifolds also known as shoulder ports or T ports and lay those out for assembly The purpose of these manifolds is to prevent water that collects in the counterlungs from reaching the gas processor The water diversion manifold at the top of each counterlung diverts water coming from either of the front breathing hoses into their respective counterlungs Because of the direction of breathing flow and the one way check valves in the mouthpiece almost all water that leaks into the mouthbit collects in the right counterlung where it can be dumped via the checkvalve port at the bottom of the counterlung F
34. Buddy Light when activated HUD Vibrator This test measures the amount of electrical Current consumed by the vibrator motor in the Head Up Display HUD when activated Metabolic O2 Solenoid 1 This test measures the amount of electrical current consumed by the first metabolic solenoid valve when activated It does not check that the solenoid actually opens and closes verified during the Positive Pressure Loop Test t32 Metabolic O Solenoid 2 This test measures the amount of electrical current consumed by the second metabolic solenoid valve when activated It does not check that the solenoid actually opens and closes verified during the Positive Pressure Loop Test t32 Oxygen Calibration Solenoid This test measures the amount of electrical current consumed by the oxygen calibration solenoid valve when activated It does not check that the solenoid actually opens and closes verified during the Positive Pressure Loop Test t32 Diluent Calibration Solenoid This test measures the amount of electrical current consumed by the diluent calibration solenoid valve when activated It does not check that the solenoid actually opens and closes verified during the Positive Pressure Loop Test t32 ERROR GODE 11 Current too low 12 Current too high 11 Current too low 12 Current too high 11 Current too low 12 Current too high 11 Current too low 12 Current too high 11 Current too low 12 Current
35. CHAPTER 3 PAGE 54 Maximum depth Ceiling In most circumstances the maximum depth achieved during the dive is displayed below the current depth in the lower left corner of the Primary Display to the left of the word Max However in the event that a diver has inadver tently incurred a decompression obligation this value changes to represent the current decom pression ceiling shallowest depth to which it is safe to ascend When displaying the ceiling value the value briefly changes to cL to indicate ceiling every few seconds as shown below POSEIDON MKVI USER MANUAL Remaining dive tims RDT The Remaining Dive Time RDT value shown as the large number on the right side of the Primary Display is based on various factors including the remaining no decompression time at the current depth oxygen supply remaining battery life and oxygen toxicity units OTUs It represents the number of minutes remaining at the current depth before one of these para meters is exceeded 199 is displayed if more than 199 minutes remain When the value falls below 5 minutes it will flash If a decompression ceiling is incurred this value changes to represent the total decompression time ascent time plus decompression stop s When displaying this value the value briefly changes to td total decompression every few seconds as shown on the previous page CH bd Figure 3 25 Remaining
36. Diluent Addition Valve ADV that compensates for breathing volume in closed circuit mode so that you will never run short of a full breath during a dive Easy maintenance the entire rebreather breaks down rapidly for washing drying and storage No tools needed New software releases can be downloaded and installed over the internet and various system parameters can be customized to meet your particular dive operating paradigm r SEM o te a J e F P w J d i p H T 8 a bg Fa rii E A Wee 7 r i ca i i L L td T J e E i K DU Ch Ke POSEIDON MKVI USER MANUAL Conformance with CE requirements The information listed in this chapter are the CE requirements that has to be met to get a CE approval and they are NOT the exact specifications of the Poseidon MkVI The exact specifications and values of the MkVI can be found in the later chapters of this user guide The below text shows that the MkVI operates within these CE requirements In conformance with the European Standard EN 14143 section 8 the following information is provided herein 8 1 This manual contains information that will enable trained and qualified persons to assemble and use the Poseidon MkVI in a safe manner 8 2 This manual is written in the English language 8 3 The application of the Poseidon MkVI is as a diving apparatus to be used for recreational no decompression diving with mixtures of air an
37. E 57 Monitoring gas Tee E or Mo nitormg remaining Welle EE St Breathing underwater sssssesrsrsrsrerrrrrrsrsreraranrsrrrsrarrriersrrrnrirnsrsrtreranrrrsrsrernrrni 58 COU NURO P ICONEN sea carat aa E E 58 SEELEN srap AG IU SU GIS Eeer 58 WOORD E 59 Me keane to BGC ONO P E E 59 Venting water from the Joop 59 EE 60 EnGING NO CUS sc satyhesecer ey acge eet gta aee aier bance anacepneeieces 60 odie OMNO WINE OSS MKV RE 61 Chapter 4 Post dive care and maintenance AOF O OA EE 62 FOW le 62 Replacing the Oxygen and CO absorbent Ga eesiriisier siiin 62 Removing the electronics ane el 62 POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE Ill Replacnd the water Tal SOONG CS anien ena E EAA AO 63 Altereach day of a le e E 63 DS NS ON eT NOs ee 63 OO NS SN COGS eae SE 63 Long term storage and TE 63 EE eebe 63 Replacing Oxygen EE 64 Traveling with the Poseidon MV 66 Beidel reel 66 Appendix roublesnooting guide ENEE EE A th ti i ts sn ne ee 67 Standard response tO test FANUC 0 ececcecsecee eee ee eee eeeeeeeeeaeeeeaee sense eeeeeeteeeenes 68 WONG STN OTIC ee 68 FCI DO UOS eree ier EE E ERE 68 Ie ebie EE EE RE E A E E E E EE 69 EO O E a E E nimaneecoageetdant sectors 69 Depth reading difference s sssssrsrsrsrrrrrrersrsrnrrrrsrsrsrerarirrsrsrrrrrnersrsrsrernrrne 69 CE en Re A E A E E E E 69 Hyperoxic linearity Test 70 FOW EPO alarm WOK E 70 What to do if can t resolve the problem 70 lable oi the E
38. ER MANUAL INGO anh e Fressie LOOD TOS EE 38 Bled teller ee UD EEN 39 Power up Self test test 1 D 40 Tesue tension 16S eer Eege 41 Open circuit mouthpiece position test A7 42 Oxygen and diluent cylinder supplies test 44 amp Af 42 Battery power verification test A9 43 Positive pressure loop test test AO 43 Closed circuit mouthpiece position test DI 44 Oxygen sensor calibration test 3 45 Open Circuit regulator function test E 45 Service interval check test D 46 NM TO EE 46 Chapter 3 Dive procedures MONORI UA EE 47 EIER Ste EE A7 RIIT E 48 A Seea e A e E E E E A E E vn aiaaitde tam pacanei assur et iseinmen 48 Ruddy alert IOM EE 48 POPP OTIC breede et Ee 48 Blat ene LE 50 eea E i E A en ATTE N E E T ETE ATE 50 Abon and ODEN crout alor GE Sab NT OVE AG GE 50 ER EE 51 EICH ONCS EE 51 Decompression er iere rai iasnatienceuemotctaeanandieaiesaueeeuanamed ourencaeeoeeennseieeyets 51 BO Eeer 51 OMe E ee ee ere ree 51 BOR e te ee eg CHAPTER 1 PAGE Il EE EH icc eet 52 OXYGEN Sensor EENEG e genee 53 MOUNDIGCS DOSI E TE EEEE E EE 54 Maximum depth Geill EE 54 Pe ReMi tC GVE UMAR D T orren E eeanauaiyeaen 55 EPP OS ln EE 99 Ascend descenqd amow uu cccecceceececcece uence eee eee eee eeeee eee eseeeeee ese eeeeeeeaeeaeeesnentegeas 50 Batory iNo NN CLO UC erisia EE AEE EREEREER 56 emperature geed EEEE rra 56 Cynder pressure e ege E 56 Ascent rate nelle er EE 56 SSN EE en MORRO TME
39. I will successfully complete all Pre Dive checks in about three minutes and a screen will appear on the display that looks like that shown in Figure 2 13 with a PO value between 0 3 and 0 9 usually the number is towards the higher end of this range because the loop is partially filled with oxygen during Tests 49 and 53 a depth of O a dive time of O and a remaining dive time clock showing 199 minutes At this point the pre dive tests are completed and the system is ready to dive Figure 2 13 Clear to dive CHAPTER 2 PAGE 46 Test 1 38 55 AO 43 50 54 44 45 48 49 53 2 S A Pre Dive Checklist Cylinders OFF CLOSE OPV OPEN CIRCUIT mode Touch wet switch keep dry for 5 sec onds then HOLD wet switch Test 44 turn cylinders ON Test 50 CLOSED CIRCUIT Test 54 OPEN CIRCUIT test bailout regulator function Confirm and Restart Needs Servicing if persistent Use correct battery Verify mouthpiece position Turn cylinders on Refill cylinders Recharge Battery Replace battery Counterlungs half full or less Verify Oxygen Sensors Post Dive Checklist Mouthpiece in OPEN CIRCUIT Both cylinders OFF Wet switch DRY Purge ADV Figure 2 14 General Pre Dive and Post Dive Checklists POSEIDON MKVI USER MANUAL CHAPTER 3 PAGE 47 Chapter 3 Dive procedures DANGER Do NOT attempt to use the Poseidon MkVI rebreather without proper training This Manual is NOT an
40. POSEIDON MKVI USER MANUAL POSEIDON MKVI USER MANUAL Table of Contents TONS Oi ER CONV ens U Sea in TSUN Eege IV Bier V Conformance With CE Heourements vi Chapter 1 Preperation amp Assembly Part 1 Preperation An Overview of the Poseidon MV 1 PET D EE Open Circuit Closed CirCuit Mouthpiece cc ccecececcecneeete teeta eeeeeeaeeeeaeeseaee ees 2 Automatic diluent adaton valve AD EE 2 Heads up dopa FUD sie tt ht tt ee a ee 2 Breathing IO OO ee 3 Carbon dioxide absorbent cartridge cccecceceeceeceeeeeeeceeeeseeeeeeeeaeeeeeeeaeeanenes 4 Gas injection nee UE 4 FS IS MOTU E 4 EE EE 4 UE EE ENEE E E E E 5 EE eene 6 Cone teure Le e A E E O A A A A A TE 7 Decompression Cale ernir aE a aaa D Beie Kn E EE 8 OF lees eessen ere 8 CHAPTER 1 PAGE KEE anad WOON eegener 10 mlllele breede e EE 11 Part 2 Assembly Eer ie 7 BOD 7 ee ME 13 Ze MLPA ee Le EE 14 EE ngs KEE Tales Mee 15 a Rear CO hoses to elle ET e e DEE 16 D Rea OC TOOD ere 18 6 Attaching th Cylinders EE 20 Gre Gg elei EEN 21 CO WS Le ET 23 Del OSS Oe PUD TO MOUNDO CE E 20 1O dJe ream EE 26 11 Front CC hoses to counter lung T section s srsrsirirrrrerrrrrrrrrrsrerersrsrrrersrne SE 12 PION OO ee e TEE 28 EE tee 20 SEENEN 36 Chapter 2 Pre dive procedures Initial Pre dive procedures EIERE erter geegent 37 AA ABSO DERT cl nn er er i ee ee of intact Breathing LOOD Ver MCaI OM E 38 POSEIDON MKVI US
41. PTER 3 PAGE 57 Monitoring remaining dive time As mentioned previously the Remaining Dive Time RDT value is based on several different factors The value displayed represents the amount of remaining time in minutes for the most limiting factor If the limiting factor is remaining battery life the value will count down consis tently regardless of depth However if the limiting factor is remaining oxygen supply the value could increase or decrease depending on the rate at which the diver is consuming oxygen The value can change even more dramatically and suddenly when the limit is based on remaining no decompression time This is because a diver with only a few minutes remaining at a depth of 30 meters for example may well have many more minutes remaining at a shal lower depth Conversely the remaining minutes may suddenly decrease sharply when depth increases Thus it s extremely important to monitor this value throughout the dive particularly after increases in depth Note that the RDT value is NOT an exact value and it should be regarded as a recom mended remaining dive time rather then an absolute remaining dive time In the event that a diver inadvertently exceeds the no decompression limits and the dive requires decompression stop s the RDT value changes to display the remaining total decompression time as described previously POSEIDON MKVI USER MANUAL Breathing underwater Counterlung placement When prope
42. Poseidon MkVI is capable of displaying parameter values in either metric or imperial units Both screens at the top of the next page show the same information except that the left screen shows the depth and temperature values in imperial units and the right screen shows the values in metric units Depth units are indicated by an FT or M and temperature units are indicated by a F or C Also the Display can be configured to represent decimal points as HD HD a period or as a comma depending on individual user preference Figure 3 4 mperial units Figure 3 5 Metric units What follows is amore detailed description of each of the LCD screen elements and what they mean It is important that all Poseidon MkVI divers become familiar with these symbols and values what they mean and how to respond when they are not displaying appropriate values or are flashing Alarm signal area CHAPTER 3 PAGE 50 Abort and open circuit alerts The most important alert symbols on the screen are also the largest The ABORT and Open Circuit symbols The ABORT symbol is a large word ABORTI in inverted font color Whenever this is displayed the dive should be immediately terminated If accompanied by the Open Circuit Alert icon image of a diver s mask second stage regulator a series of bubbles on either side of the diver s face and a small up arrow above the diver s mask the diver must immediately te
43. T symbol and the DO NOT DIVE symbol in the center of the upper half of the Alarm Signal Area is dis played in one of two circumstances either the diver is ascending too rapidly or the diver has reached the decompression stop depth ceiling In either case the appropriate response is to immediately stop ascending and the diver should maintain the current depth until the symbol disappears Figure 3 13 PO value PO value The oxygen partial pressure PO in the breath ing loop is displayed prominently in the upper left corner of the Primary Display This is perhaps the most important number on the entire screen as maintaining an appropriate oxygen partial pressure in the breathing gas is critical to ensure safe diving If the value departs substantially from the current PO setpoint the value will flash If the value becomes dangeously high or dangerously low the diver will be prompted to switch to open circuit mode and terminate the dive POSEIDON MKVI USER MANUAL PO setpoint Every few seconds the PO value will briefly less than one second switch to show the current PO Setpoint Normally this value will be the same as the current PO because the system will normally maintain the correct PO e Setpoint PO In some cases however the value may be slightly different In any case the PO Setpoint value can be distinguished from the current PO value by the size of the first digit either 1 or
44. VI USER MANUAL 13 Scrubber The largest physical element of the rebreather is the CO absorbent system also referred to as the Gas Processor unit it physically includes the gas sensing and electronics control modules The outer shell of this system shown in Figure 1 46 comprises the structural backbone of the Poseidon MkVI and both the diluent and oxygen cylinders attach to the side of this extruded aluminium tube The top section of the housing is the mounting structure for the electronics module The main tube is the housing for the CO absorbent cartridge The base plate seals the housing and also allows for modular loading of the CO absorbent cartridge Because CO production rate is closely correlated with oxygen consumption the Poseidon MkVI was designed such that the CO absorbent cartridge duration corresponds to the oxygen cylinder capacity Thus the absorbent cartridge MUST be replaced whenever the oxygen cylinder is refilled To remove the spent cartridge loosen all four 4 large hand nuts at the Figure 1 46 Overview of the cartridge house and the CO absorbent cartridge Outer shell Cartridge housing CHAPTER 1 PAGE 30 bottom of the cartridge housing to the point where they spin freely no tools are required see Figure 1 48 The canister has been tested for a duration of 180 minutes at 40m water temp 4 C anda breathing rate of 40lom producing 1 6 CO per minute at STPD Standard Temperature amp
45. advise an immediate abort to the surface in open circuit mode Always pay particular attention to the instructions regarding o ring installation and o ring surface inspection POSEIDON MKVI USER MANUAL 8 1st stages Connect the 16 cm Low Pressure hose to a IP port on the diluent 1ststage and to the 9 16 connection on the pneumatics block marked DIL Make sure the connection o ring is in place and without damages See Figure 1 32 Figure 1 38 illustrate the assembly of the diluent cylinder with the gas processor stack analo gous to that of attaching the oxygen cylinder Always inspect cylinder and regulator threads and the regulator o ring before assembly If the regulator o ring is damaged gouged scratched or otherwise worn or cut replace it with an appropriate Poseidon oxygen cleaned o ring Figure 1 32 16 cm Low Pressure hose s to the pneumatics block PAGE 23 CHAPTER 1 N we Figure 1 33 Align the diluent regulator with the diluent cylinder female DIN thread Push it in and hand tighten the diluent regulator swivel nut Figure 1 34 Align the oxygen regulator with the oxygen cylinder female DIN thread Push it in and hand tighten the oxygen swivel nut Connect the oxygen clean white marking 16 cm Low Pressure hose to a IP port on the oxygen clean 1st stage and to the 9 16 connection on the pneumatics block marked O See Figure 1 32 Make sure the connection o ring is in place and without damages
46. aircraft Before removing the valves from the cylinders it is necessary to completely drain the cylinders of any gas pressure If the cylinders are full or the valves opened such that the cylinders drain quickly the metal of the cylinders and valves will become cold and produce beads of moisture condensation It s important that this moisture not be allowed to get inside the cylinder so always allow the cylinders to warm back up to room temperature and wipe off any remaining moisture before attempting to remove the valves from the cylinders Removing valves from cylinders can sometimes be tricky DO NOT attempt to use tools such as hammers mallets wrenches pliers or other such devices to remove the valves unless you know exactly what you are doing It is highly recommended that the cylinders be taken to a qualified dive shop or service center to have the valves removed The same is true when replacing the cylinders at the dive destination or upon returning from a trip AS soon as the valves are removed be sure to insert an appropriate plastic plug into the threaded opening of the cylinder to prevent dirt moisture and other contaminants from entering the cylinders DANGER The cylinders have been specially cleaned for use with high pressure oxygen Allowing contaminants to enter the cylinders risks fire and explosion and could lead to serious injury or death POSEIDON MKVI USER MANUAL APPENDIX PAGE 67 Appendix Troub
47. al rule of thumb 1 minute on the battery charger in standard charge cycle mode will load 10 minutes of charge into the battery Thus if you charge while taking a 30 minute break between dives you will have added 5 hours of dive time to the battery Leaving the Smart Battery in the Charger Although it is acceptable to leave the smart battery in the charger when not in use it is recommended that the battery be left attached to the Poseidon MkVI after a successful charge for the following reasons e f power to the charger fails at any time then having the battery in the charger will actually deplete the cell approximately as fast as if the battery was installed in the rig and the rig powered up e Storing the battery in the Poseidon MkVI enables the depth sensor and the wet switch on the back of the primary display If someone wearing the MkVI accidentally falls into the water the system will automatically power up the rig enhancing the probability for survival of the user This is only possible if the battery is charged and stored in the rig e Storing the battery in the Poseidon MkVI reduces the probability of debris entry and impact damage to the battery contacts in the electronic module CHAPTER 1 PAGE 7 Long term storage Allowing the smart battery to sit for long periods of time on shelf without recharge will lead to oremature failure of the battery The best storage method if the battery will not be used for a substantial
48. ars from the Display the letters CC flash in the upper left corner of the LCD the HUD vibrates the HUD and battery LEDs flash and the audio speaker sounds All of this indicates that the mouthpiece should be placed in the Closed Circuit CC position Ae soon as the mouthpiece is in the Closed Circuit position and is detected by the HUD the test will pass The system allows 2 minutes for this test to be completed before timing out POSEIDON MKVI USER MANUAL As with the Open Circuit mouthpiece position Test 43 if the mouthpiece appears to be in the closed circuit position but Test 50 does not pass then make sure that the mouthpiece switch is fully in the CC position If the test still will not pass then make sure the HUD is positioned correctly in the mouthpiece and is not twisted or otherwise adjar from its proper position If no amount of repositioning of the mouthpiece lever or HUD allows the system to pass Test 50 then contact an authorized Poseidon Service Center Figure 2 10 Test 50 Open Circuit mouthpiece position Oxygen sensor calibration test 53 Test 53 Figure 2 11 calibrates the oxygen sensors Part of this test is to ensure that the oxygen supply is really oxygen and that the diluent supply is really air The system will start by injecting pure oxygen directly on the primary oxygen sensor for 20 continuous seconds thereby flooding the entire oxygen sensor chamber with enough oxygen to also calibrate
49. as supply pressures DANGER Always open the oxygen cylinder valve slowly Rapid pressurization increases risk of fire Opening the valve slowly reduces this risk Carefully maintaining clean oxygen regulators cylinders and valves before during and after your dives will further reduce this risk CHAPTER 2 PAGE 43 Battery power verification test 48 Immediately after passing the two gas pressure tests the pre dive routine tests whether there is Sufficient battery power to begin a dive Test 48 The amount of power required depends on how recently the battery was subjected to a Learn Cycle during charging see Chapter 1 If the Learn Cycle occurred recently then the system is able to predict the remaining battery life relatively accurately and Test 48 will pass if the battery has at least 20 charge remaining approximately 5 6 hours of typical dive time or 4 hours of night diving time The amount of charge required to pass this test increases by 0 5 per day since the last Learn Cycle such that after 160 days with no Learn Cycle Test 48 will not pass This test will pass or fail immediately If it fails the only remedies are to re charge the battery and or subject it to a Learn Cycle or replace the battery with another one with greater charge subject to decompression data discrepancies as discussed previously for Test 40 Positive pressure loop test test 49 One of the most basic pre dive tests for any rebreather
50. ated There should not be much resistance when inserting the sensor base into the electronics module If excessive resistance is evident inspect the o rings to make sure they are seating oroperly and make sure the electrical wires are not pinched between the sensor and the sur rounding walls Flat edge of the sensor base faces i towards the top of the electronics module Figure 4 6 Insert the new oxygen sensor mio fe electronics module with the flat edge of the sensor base facing upwards DANGER The oxygen sensors are the most important components of any rebreather Handle them with care and make sure the electrical connections are clean and properly attached CHAPTER 4 PAGE 66 Traveling with the Poseidon MkVI Many people conduct most of their diving activities at destinations far from home As such it s entirely likely that Poseidon MkVI owners will want to travel with their rebreathers to far off destinations Indeed a great deal of effort went into the design and development of the MkVI to ensure that it was lightweight and easy to travel with Preparing the cylinders There are strict laws concerning the transport of pressurized gas cylinders on aircraft and different airlines will have different policies to assure compliance with these laws At a minimum most airlines require that cylinder valves be removed and that the cylinders themselves be available for inspection prior to loading onto an
51. bailout situation thereby instructing the diver to switch the mouthpiece from closed circuit mode to open circuit mode Once the mouthpiece has been properly switched the vibrator signal will stop Occasionally this signal will be triggered when the system is unable to detect the position of the mouthpiece perhaps because it is not completely set in one position or the other open or closed If the HUD vibrator signal continues even after switching the mouthpiece first make sure the mouthpiece is completely switched to the new position If the vibration continues then switch the mouthpiece back to its original position again making sure it is completely rotated If the HUD vibrator signal persists then terminate the dive immediately in open circuit mode In rare cases the vibrator is intended to prompt the diver to switch from OC position back to CC position This will only occur when the diluent supply is low and the loop PO is known to be safe The important thing is to adjust the mouthpiece position whenever it vibrates The other HUD vibrator signal consists of a short 1 2 second blip that is triggered every 2 minutes whenever the RED HUD LED is flashing see below as an alert to view the Primary Display Do NOT change the mouthpiece position in response to a short singular blip of the HUD vibrator POSEIDON MKVI USER MANUAL HUD Light The HUD incorporates a RED LED light designed to signal that there is a possibl
52. be filled with oxygen containing less than 0 4 impurities The Poseidon MkVI may only be used with specially designed Sofnodive 797 pre packed cartridges manufactured by Molecular Products Only accessories and or other personal protective equipment specifically authorized by Poseidon Diving Systems may be used with the Poseidon MkVI All other third party additions or modifications are not covered within the intended usage of this equipment 8 5 The Poseidon MkVI is designed to extend the duration of recreational dives POSEIDON MKVI USER MANUAL Chapter 1 Preparation and Assembly Part 1 Preparation This chapter describes the steps to assemble and prepare the Poseidon MkVI for diving The MkVI is a modular device with several key systems Each of these systems is described in a sequence that naturally follows the way one would service the rig An overview of the Poseidon MV Throughout this manual the terms left right front and back refer to specific areas of the Poseidon MkVI Figures 1 1 and 1 4 illustrate these loca tions and the main systems of the Poseidon MkVI The left side of the rig corresponds to a diver s left side when wearing the rig normally the right side of the rig corresponds to the right side of the diver when wearing the rig normally The front of the MkVI is the location furthest in front of a diver s chest when wearing the rig normally the back
53. cable junkction box point in the direction of the two canister housing top breathing loop interface Gently push the e module in place and tighten the two screws securing the e module Diluent cylinder high CHAPTER 1 PAGE 21 At the heart of the Poseidon MkVI is an electronic pneumatic control and user feedback system The electronics module shown at the center of Figure 1 29 contains the primary backpack computer system the smart battery and the pneumatics control block assembled in one compact plug and play block The electronics module contains its own processor connected via a network to the processors in the primary display battery module and the HUD head up display in the mouthpiece Pneumatic connections to the oxygen and diluent regulators allow for PO control and oxygen sensor calibration and validation This entire electronics system comes pre assembled from Poseidon when you purchase the Poseidon MkVI Several of these sub systems will be dis cussed in detail later To begin assembly of the electronics module into the gas processor backpack set the car tridge housing upright and on a solid flat base as shown in Figure 1 29 Primary display Diluent regulator Oxygen regulator Mouthpiece pressure Sensor Electronics module SS CAM Me Oxygen cylinder high ee A pressure sensor Figure 1 29 nspect the Electronics Module and Related Components POSEIDON MKVI USER MANUAL Inspect the in
54. ch new cartridge is good for at least 3 hours of diving some users may obtain greater range depending on metabolic oxygen consumption rates Once you open the air tight shipping envelope the SofnoDive 797 cartridge is activated Figure 1 54 Unpacking a fresh SofnoDive 797 CO absorbent cartridge Opening the sealed SofnoDive 797 air tight shipping envelope POSEIDON MKVI USER MANUAL Radial o ring seat to bottom y of SofnoDive 797 Cartridge Top end of cartridge has projecting ribs Twin radial o ring seals for cartridge housing end cap Figure 1 56 Loading the Cartridge End Cap into the new replacement SofnoDive 797 cartridge Figure 1 57 Loading the Poseidon MkVI Cartridge Top Cap into the replacement Sofno Dive 797 cartridge Inspect the two larger radial o rings on the cartridge end cap Figure 1 56 and if either is damaged cut or gouged replace it the third o ring that mates with the cartridge does not form a seal Ensure that each o ring is lubricated and that there is no debris dust sand etc on any of the o rings Insert a dry clean disinfected annular sponge into the receiver pocket for the cartridge end cap water trap this is the reverse of the procedure shown in Figures 1 52 and 1 53 Be sure the inner diameter of the sponge is locked under the retainer plate see Figure 1 52 Insert the end cap into the bottom of the SofnoDive 797 cartridge The bottom end is the one
55. counterlungs should be no more than half inflated IMPORTANT Make sure the over pressure relief valve on the bottom of the right exhale counterlung is adjusted to the maximum cracking pressure turned all the way in the clockwise direction Also ensure that the mouthpiece is in the OC position that the oxygen cylinder valve is turned on and the counterlungs are not already inflated Otherwise Test 49 will fail Make sure that nothing pushes against the OPV that will cause the T49 to fail The sequence of events for Test 49 and the various corresponding tests that are conducted are as follows First the system injects oxygen into the breathing loop until the counterlungs are both full but not tight detected by the depth sensor as a slight pressure increase This is why it s important that the counterlungs not already be fully inflated prior to starting Test 49 which can occur if the cylinders are turned on during tests 24 27 This initial inflation is done via one of the two metabolic oxygen solenoid valves thereby ensuring that this solenoid valve is actually injecting gas when it is Supposed to Figure 2 7 Test 43 Mouthpiece in OC position displaying Open Circuit icon to indicate that the mouthpiece must be placed in the Open Circuit position CHAPTER 2 PAGE 44 Once the counterlungs are fully inflated and the depth sensor detects a slight increase in oressure the system pauses and monitors internal loop press
56. d not be started If a test fails the routine is halted at the failed test and the value displayed on the right side of the screen changes from a countdown timer to an error code see Figure 2 6 Both values the test number and the error code flash for five seconds before the rig powers down automatically If the wet switch is connected e wet then the rig will not power down and the system will inject excessive oxygen intermittently in case a diver is breathing on the loop When one of the PSTs fails consult Appendix 1 to understand further what the failed test means In most cases the first thing to try is to run the automatic pre dive routine again by activating the wet switch on the back of the Primary Display If the same test fails again with the CHAPTER 2 PAGE 41 same error code wait for the electronics to power down then eject and re seat the battery see Chapter 1 If the automatic pre dive routine persistently fails any of these tests contact a Poseidon Tech Center for assistance In general repeated failure of any one of these automated tests indicates a problem with the Poseidon MkVI that will not be serviceable by the user DANGER Do not attempt to conduct a dive until the system has successfully completed all of the pre dive tests Diving in spite of a failed pre dive test is extremely dangerous and could lead to serious injury or death Tissue tension test test 40 As discussed in Chapter 1 the Pose
57. d on a full inhalation then there is not enough gas in the breathing loop This condition should be corrected automatically by the ADV Tips on buoyancy control Controlling buoyancy while diving with a rebreather is considerably different from buoyancy control with conventional open circuit scuba To begin with whereas a scuba diver needs to manage buoyancy characteristics of two separate factors the Buoyancy Control Device BCD and the exposure suit i e a wetsuit or a dry suit A rebreather diver must manage both of these as well as the breathing loop of the rebreather A complete discussion of buoyancy control with closed circuit rebreathers is beyond the scope of this Manual However the following tips might be useful Although most divers probably do not realize it fine trim for diving with conventional scuba gear is achieved through breathing On each inhalation the diver s lungs expand and buoyancy is increased The opposite occurs on exhalation However this does not occur with a rebreather the Poseidon MkVI included because the buoyancy increase caused by expanding the lungs on an inhaled breath is offset by the decreasing volume of the counterlungs and vice versa This may at first be disconcerting for an experienced scuba diver trying a rebreather for the first time because an inhalation done subconsciously to slightly increase buoyancy has no effect However with practice it becomes advantageous to be able to hover in
58. d oxygen The Poseidon MkVI is certified to a maximum operating depth of 40 meters 130 feet Two gas supply mixtures are used with the MkVI air and oxygen gt 92 pure and the maximum depth for the resultant breathing mixture blended by the Poseidon MkVI is 40 meters 130 feet Use of the MkVI is limited to diving underwater solely by persons who have received proper training and for use on no decompression dives in environments without obstruction between the diver and the surface Detailed instructions on assembly of the Poseidon MkVI including descriptions of the individual components the specific connections between components and the various safety devices are included within Chapters 1 and 2 of this manual The user shall be able to understand the risk and make an assesment regarding the risk of using the Poseidon MkVI with input from the manual before a dive if the diver believes it is needed CHAPTER 1 PAGE VI The operating temperature for the Poseidon MkVI is between a minimum of 4 Celsius 89 Farenheit and a maximum of 35 Celsius 95 Farenheit Operation at temperatures outside of this range may lead to unreliable function The Poseidon MkVI is intended for use on dives involving low to moderate work rates typical of normal recreational diving activities Although it is capable of sustaining divers operating with high work rates this is not its intended purpose The Poseidon MkVI is intended to mai
59. d the CO absorbent cartridge and will generally collect in the exhalation right hand counter lung Sometimes water will collect in the exhalation hose immediately downstream of the mouthpiece If this water is sufficient to cause gurgling noises with each breath it can be poured into the exhalation counter lung by looking upward and holding the hose in such a way so as to dump the water towards the right hand shoulder port In most cases the water that collects inside the exhalation counter lung will not disrupt the function of the Poseidon MkVI in any way so it can be safely ignored However sufficient quantities of water could be returned to the breathing loop if the diver becomes inverted so it may be desirable to vent this water from the breathing loop altogether To do this the diver should first become negatively buoyant or attach to a secure object on the bottom The breathing loop volume should be increased to at least 75 of maximum capacity by manually adding diluent via the ADV The loop vent valve at the bottom of the exhalation counter lung should be rotated counterclockwise maximally to minimize the cracking oressure While in an upright orientation the diver should then compress both counter lungs by squeezing them against the chest with the elbows and upper arms while simultaneously exhaling through the mouth and depressing the loop vent valve to open it If done correctly water will be expelled from the loop vent valve first
60. decompression information is corrupted e g from inadvertant electrostatic discharge there is a possibility that the computer system may only recognize the rebreather system s stored decompression data In that event and if the previous diver of that rebreather did not incur as serious a decompression debt then swapping batteries could lead to serious injury or death from incorrect decompression on subsequent dives CHAPTER 1 PAGE 8 WARNING If a user changes batteries with a Poseidon MkVI unit other than the one they were most recently diving and then turns on the power of the new Poseidon MkVI with their original battery installed the Pre Dive test routine will FAIL Test 40 decompression comparison between battery and backpack computers This is a warning that there is a difference in the decompression data stored in the rebreather s computer and the battery just inserted Once the display times out and goes blank the system can be re started and the Pre Dive test will pass on this second attempt The user assumes all responsibility for their own decompression safety in this event The rebreather will calculate decompression based on the most conservative values from each set of decompression data Dive log data The Poseidon MkVI automatically creates an extensive dive log every time the system is pow ered up The information stored in this log will be of significant interest in reconstructing dives and learning about
61. dive care and maintenance Proper post dive procedures are important for any rebreather and the Poseidon MkVI is no exception Such procedures not only ensure that the system will work correctly on the next dive but will also extend the functional life of the unit This chapter is divided into four main sections including information on care and maintenance that should be done following every dive steps that should be done at the end of each diving day long term care and storage and information concerning travelling with the rebreather After each dive The extended dive durations possible with the Poseidon MkVI will likely exceed the amount of time most divers will want to spend on any one dive As a consequence in many cases it is likely that divers will conduct more than one dive in a single day Power down After each dive if the next dive will not occur within a few minutes it s important to follow the steps listed at the end of Chapter 3 to shut the power down on the electronics system Failure to do so will not cause any risk to the diver or the Poseidon MkVI itself but it will lead to unnecessary battery consumption thereby requiring re charging sooner than would otherwise be the case Replacing the oxygen and CO absorbent cartridge If the remaining oxygen supply is insufficient for a second dive and the cylinder needs to be refilled then it is imperative that the CO2 absorbent canister be replaced at the same time Thi
62. dive time RDT Go d af e a Cn f Je oO CHAPTER 3 PAGE 55 Elapsed dive time The number of minutes that have elapsed during the dive i e the total dive time is dis played in the lower right corner of the Primary Display next to the small clock symbol printed on the LCD glass This value represents the total elapsed time since the start of the dive It begins incrementing only when a dive has started and stops incrementing when the dive ends If a subsequent dive is conducted without allowing the unit to power down then the elapsed dive time resets D 00 Ae O Figure 3 26 Elapsed dive time Ascend descend arrow Located in the center of the Primary Display between the Current Depth value and the Remaining Dive Time value is a symbol that can display an up arrow or a down arrow When the up arrow is displayed the diver should immediately begin a safe controlled ascent The up arrow does not necessarily mean that the dive must be terminated it may only indicate that the diver is approaching the no decompression limit at the current depth in which case ascending a certain amount may cause the up arrow to stop flashing e when the depth is shallow enough that the diver has ample remaining no decompression time at the current depth it bei LEO Figure 3 27 Ascend arrow J emm Lion Figure 3 28 Descend arrow In the unlikely event that a diver incurs a decompression
63. don Service Center for repair RAM is tested only when the battery is inserted and the results used for all subsequent power up routines Other tests 3 Bad ROM 1 Standard Response 2 If test continues to fail attempt to reinstall are conducted on each power up routine Firmware may cause unrecoverable failure 3 If test failure persists contact an authorized Poseidon Service Center for repair 3 1 Display EEPROM This tests the EEPROM static memory in the 6 Bad 1 Standard Response 2 If test continues to fail reset system parameters Primary Display which contains user selectable configuration EEPROM 3 If test failure persists contact an authorized Poseidon Service Center for information for internal errors or data corruption repair 4 1 HUD ROM RAM Fuses This tests the RAM ROM and fuse 4 Bad RAM 1 Standard Response 2 If test failure persists contact an authorized settings of the electronics in the HUD Head Up Display The 5 Bad Fuse Poseidon Service Center for repair RAM is tested only when the battery is inserted and the results used for all subsequent power up routines Other tests 3 Bad ROM 1 Standard Response 2 If test continues to fail attempt to reinstallFirm are conducted on each power up routine ware may cause unrecoverable failure 3 If test failure persists contact an authorized Poseidon Service Center for repair 5 1 HUD EEPROM This tests the EEPROM static memory in the 6 Bad 1 Standard Response
64. e 2 3 This flashing signals the diver to again connect the two wet switch contacts either with fingers water or a metal object for a period of about eight seconds as indicated by the bar graph on the right side of the screen increasing from top to bottom The normal power up procedure consists of the following three steps e Connect the wet switch contacts momentarily until the initial screen appears e Release the contacts for 5 seconds until the two segments flash on the right side of the screen e Connect the wet switch contacts a second time and hold continuously for 8 seconds The ascent rate bar graph across the top of the screen serves as a progress bar indicating the amount of time remaining for the diver to complete the power up confirmation routine about 30 seconds After completing the power up confirmation procedure all of the segments in the Primary Display will display momentarily Figure 2 4 It s important for the user to note whether any segments are missing and if so not to attempt to dive the unit until it has been repaired POSEIDON MKVI USER MANUAL at an authorized service center After displaying all segments the system proceeds to the initial start up tests If the system is powered up by inserting the battery the system continues directly to the all segments screen Figure 2 4 without the need to complete the power up confirmation routine The Poseidon MkVI electronics system conducts 55 auto
65. e a problem that a simple reboot might not Be sure to allow the system to power down before attempting to reset the battery APPENDIX PAGE 68 Troubleshooting table lf after attempting the Standard Response to a test failure the automatic pre dive routine consistently fails on the same test note the test number and error code for the failed test and consult the table on the following pages Some of the solutions in this table suggest that the system parameters be reset or the firmware be re installed as follows e Reset System Parameters In some cases a test may fail because some of the user selectable parameters have become corrupted Thus for certain tests the Configuration PC software can be used to reset system parameters e Re install Firmware In a few rare cases a failed test may be due to corrupt or inconsistent firmware In such cases the Bootstrap load PC software can be used to re install the firmware Hardware issues Following the table for the automatic pre dive tests is a similar table for troubleshooting various issues related to the Hardware other than the automatic pre dive routine POSEIDON MKVI USER MANUAL If you get an error on test 49 Test 49 is the Positive Pressure Loop test PPLT where the unit checks for leaks in the breathing loop and if the solenoids are opening and closing they way they should If your unit fails on this test check the following Is the OPV valve on the exhalat
66. e or two whether the breathing hoses expand from their contracted state and the counterlungs show signs of relaxing or inflating slightly If they do then there is a leak somewhere in the breathing loop This could be caused by any number of reasons including but not limited to any of the following e mproper hose connection hose not connected or incompletely connected e Missing or failed o ring in a hose connection or a Shoulder Port connection e Tear in a counterlung or hose e Failed overpressure checkvalve e CO cartridge lid not in place or o rings damaged or missing e Mouthpiece o rings damaged or missing POSEIDON MKVI USER MANUAL Electronics Power Up Insert the battery following the procedures described in Chapter 1 which will automatically power up the electronics If the battery is already inserted the electronics can be powered up by connecting the wet switch on the back of the display with a pair of wet fingers as shown in Figure 2 1 What happens next depends on how the system is initially powered up If it is powered up by touching the wet switch Figure 2 1 then the first screen displayed shows the installed firmware version number and the Poseidon MkVI serial number Figure 2 2 The firmware version number is shown in large digits on the left side of the display screen Because the MkVI is designed to accept firmware updates knowing the specific version number of the firmware is extremely important when diagno
67. e oxygen sensors the main computer system and the junction for the cables leading to the display cylinder pressure gages and HUD Two thumb wheel screws allow for easy removal of the electronics module from the gas processor housing after diving Smart battery The smart battery Figure 1 6 is another patent pending design of the Poseidon MkVI It is a snap in power supply that allows operation of the rebreather for up to 30 hours when fully charged It also contains its own onboard computer and stores not only your dive log data but also your decompression status tissue tensions Keeping track of repetitive dive status The smart battery communicates with the other system computers via the network and contains two user feedback systems The first system consists of two extremely bright red LEDs one facing up the other facing backwards that provide a wide viewing angle the second is a 2 frequency acoustic speaker that broadcasts a very audible tone through the water Both systems are primarily designed to convey the safety status of your diving rig to CHAPTER 1 PAGE 4 your partner from a distance Once the rig is properly turned off following a dive the smart battery can be removed and taken to a desk top charging station Use and maintenance of the smart battery are discussed later in this chapter Figure 1 5 E module with battery inserted POSEIDON MKVI USER MANUAL Figure 1 6 Smart battery module Smart battery ca
68. e oxygen sensors can read PO2 values above 1 0 If the unit for any reason fails the hyperoxic Linearity test the maximum setpoint used during the dive is 1 0 There are a few things you can do to increase the chance of a successful Hyperoxic Linearity test When descending give the unit time to perform the test i e don t descend too fast between 6 m 20 swf to 10 m 83 swf Avoid repeated ascend descend depth changes between 6 m 20 swf to 10 m 33 swf until the Hyperoxic Linearity test is completed APPENDIX PAGE ZU How the PO alarm works The PO status is processed in the following order If the PO is lt 0 25 then a hypoxic alarm will occur immediately If the PO is gt 1 8 then a hyperoxic alarm will occur immediately If the PO is gt 1 6 and has been so for more then 1 minute a hyperoxic alarm will occur If abs PO SP gt SP 4 and has been so for more then 2 minutes a deviation alarm will occur Note SP setpoint In all other cases no alarms will occur What to do if can t resolve the problem If you can t resolve the problem you are experiencing do the following e Connect your Poseidon MkVI to a computer laptop using the PC Configuration program available as a download from www poseidon com e Download the Red Box Log file from the two last failed pre dice checks or from the last dive where you experienced the problem e lf you experienced problems during a dive also downl
69. e primary oxygen sensor is Known to be linear to at least 1 0 bar atm based on the successful completion of the pre dive calibration process Thus as long as the PO does not exceed 1 0 bar atm the response value is known with confidence Using the default surface and deep PO setpoint values a setpoint of 1 0 is not achieved until the depth exceeds 6 m 20 ft so there is no consequence on dives shallower than this depth even if the Hyperoxic Linearity test is never performed Until the Hyperoxic Linearity test passes successfully the PO setpoint value will be limited to 1 0 bar atm POSEIDON MKVI USER MANUAL Oxygen sensor confidence One of the most sophisticated features of the Poseidon MkVI is the automatic oxygen sensor validation system which monitors the reliability of the oxygen sensors throughout the dive Through a series of algorithms the system assigns a confidence rating to current oxygen sensor readings based on several factors includ ing primary sensor validation dynamic response of sensors and a comparison between primary and secondary sensor values If for some reason the system loses confidence in the oxygen sensors then every few seconds an error will be displayed momentarily on the Primary Display where the PO value is normally dis played in a manner similar to how the PO Setpoint is displayed If there is no confidence in the oxygen sensors then COQ is displayed Other level
70. e problem Red Under normal diving conditions the RED light will periodically blink to serve as a reminder to the diver to monitor the Primary Display Whenever a problem has been detected by the system or when any of the dive parameters are not within safe limits the HUD light will flash continuously RED and the vibrator will blib every 60 seconds In either case the purpose of the HUD light is to alert the diver to look at the primary display for further information Figure 3 1 HUD light CHAPTER 3 PAGE 48 Audio alarm One of the two alarm systems located in the battery module is the audio alarm It emits a loud staccato tone that alternates between two frequencies as a signal to abort the dive Whenever the audio alarm is triggered the diver should immediately terminate the dive and commence a safe ascent to the surface while monitoring the Primary Display The audio alarm will continue to sound whenever the mouthpiece is not in the correct position or when the diver fails to ascend in an abort situation Buddy alert light Also contained in the battery module is the buddy alert light This consists of two separate high intensity red LED lights that flash whenever the HUD Light is flashing The purpose of this alarm is to alert other nearby divers of a potential problem Monitoring the primary display Most of the information concerning the status of the dive and the various system parameters is Communicated to the di
71. ectronics alert Diluent gas pressure General alert Current depth Remaining dive time i E IO OC OD emt Ll e Temperature OR High res PO Di Maxumum depth Flapsed dive time Battery indicator Ascend descend indicator y Figure 3 2 LCD display layout Figure 3 3 Fields on the primary display The next most important region is the upper left part of the screen where the current PO value is displayed 2 in figure 3 2 The lower half of the screen includes basic information about depth on the left side 3 and time on the right side 4 The left and right edges of the DANGER screen 5 include bar graphs that represent the current capacity of the diluent left side and If the Primary Display screen is ever blank while diving the oxygen right side cylinders as a percentage of total cylinder capacity Finally the top edge of the screen 6 includes a bar graph that represents the current ascent rate of the diver Poseidon MkVI immediately commence an abort to the surface in Open Circuit mode regardless of whether the HUD Vibrator is When the Poseidon MkVI electronics are started via the wet switch or when the battery is activated Failure to do so could lead to serious injury or death inserted into the unit the LCD screen momentarily shows all elements of the display as illus trated below Each of these elements is described in detail below POSEIDON MKVI USER MANUAL Units of measure The
72. ensors needs to be replaced The troubleshooting guide table in Appendix 1 lists all of the error codes for Test 53 If the test fails consistently with Error Code 67 68 72 73 or 76 the Primary oxygen sensor needs to be replaced If the test fails consis tently with Error Code 69 70 74 or 75 the Secondary oxygen sensor needs to be replaced Note Error Codes 66 and 71 of Test 53 are likely due to incorrect diluent or oxygen mixtures but may suggest the need to replace both oxygen sensors Included with the Poseidon MkVI is the Oxygen Sensor Removal tool Figure 4 1 This tool is specially designed to remove oxygen sensors from the electronics module As shown in Figure 4 1 the tool is held with the forefinger and middle finger through two large holes on either side of the plunger with the thumb on the plunger button similar to holding a syringe With the splayed flange of the tool lined up with the hole of the oxygen sensor base snap the tool into the sensor base as shown in Figure 4 2 It s important to note that the tool locks into the oxygen sensor base when plunger button is pressed Therefore do NOT attempt to insert or remove the tool from the oxygen sensor base while the button is pressed CHAPTER 4 PAGE 64 Primary oxygen sensor Secondary oxygen sensor e Oxygen sensor removal tool Figure 4 1 Oxygen sensor removal tool Do NOT press butten when snapped into base Figure 4 2 Removal tool snapped in
73. ent solutions Mouthpiece Closed Circuit Position This test requires that the mouthpiece be in the Closed Circuit CC position in order to pass During this test if the system does not detect the CC position the red LED and the vibrator on the Head Up Display HUD will pulse continuously to signal the diver to adjust the mouthpiece position Oxygen Sensor Calibration Like the Positive Pressure Loop Test t32 this test check several things besides performing an oxygen sensor calibration including the composition of the diluent and oxygen supplies the proper funcioning of both the oxygen and diluent calibration solenoid valves and other parameters associated with the oxygen sensor behavior The mouthpiece must remain in the CC position for the duration of this test ERROR CODE 46 Failed to Fill Loop 47 Solenoid 1 Failure 49 Loop Leaking 48 Did not fill the loop in time 50 Valve Leaking O Timeout 66 Diluent FO2 Bad 71 Oxygen FO2 Bad APPENDIX PAGE 76 SOLUTION 1 Ensure mouthpiece is in OC mode 2 Ensure oxygen cylinder valve is connected and turned on with sufficient pressure 3 Ensure all connections seals and o rings for the breathing hose connections Water Diversion Manifolds Electronics Module and bottom cover of the gas processing unit are attached and seated correctly 4 Inspect for tears cuts or punctures in the counterlungs and breathing hoses 5 If test failure persists in spite o
74. f a sealed loop contact an authorized Poseidon Service Center for repair 1 Ensure dump valve on right counterlung is turned all the way clockwise 2 Ensure oxygen cylinder valve is connected and turned on with sufficient pressure 3 Inspect for tears cuts or punctures in the counterlungs and breathing hoses 4 If test failure persists in spite of a sealed loop contact an authorized Poseidon Service Center for repair 1 Ensure breathing loop is stable during test 2 If test failure persists in spite of a sealed and stable loop contact an authorized Poseidon Service Center for repair 1 Ensure that the mouthpiece is fully in the CC position sometimes requires firm pressing on the mouthpiece lever 2 Ensure that the HUD is properly positioned on the top of the mouthpiece and that the exhaust cover is holding it tightly in place 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Ensure Diluent has correct oxygen percentage 2 If test failure persists contact an authorized Poseidon Service Center for repair 1 Ensure Diluent has correct oxygen percentage 2 If test failure persists contact an authorized Poseidon Service Center for repair POSEIDON MKVI USER MANUAL APPENDIX PAGE 77 Service Interval This test ensures that the rebreather has been properly serviced within the past two years 104 weeks The number of weeks remaining until Servicing is required is shown in the lowe
75. fications on the cylinders if necessary Breathing hoses should be stored in a clean dry location where the insides of the hoses are exposed to open air and in a way that allows them to be laid straight It is important not to bend them sharply or store them in a way that causes deformation of the circular cross section of the hoses lest such distortions become permanent POSEIDON MKVI USER MANUAL Electronics should be stored in a clean dry environment with the battery and oxygen sensors removed and stored separately The battery should be recharged periodically as described in Chapter 1 Keep in mind that oxygen sensors may need to be replaced if the rebreather is stored for extended periods First stage regulators should receive annual servicing as needed The open circuit regulator built into the mouthpiece of the Poseidon MkVI should be serviced by a qualified Poseidon Service Center prior to diving after an extended period of storage Before storing the rebreather for extended periods it s good practice to lubricate the user accessible o rings to minimize the affects of aging and extended drying If long term storage is expected to extend for several months or more it is good practice to break down the cylinders and rebreather for storage in the provided case as described below Replacing oxygen sensors If the automated Pre Dive routine consistently fails on test 53 oxygen sensor calibration one or both of the oxygen s
76. g any position information at all unknown In the former case the problem is likely due to the mouthpiece switch being in the wrong position one or both of the magnets inside the mouthpiece being damaged or corrupted or a problem with the magnet sensors in the HUD The latter case would arise if the HUD was unable to communicate reliably with the Display In any case if the displayed value of the mouthpiece position is not what it should be first check the actual position of the mouthpiece make sure it is firmly and completely in one position or the other and attempt to wiggle the HUD slightly Figure 3 20 Mouthpiece position Unknown Figure 3 19 No Circuit mode POSEIDON MKVI USER MANUAL Current depth Immediately beneath the PO value on the left side of the screen is the current depth reading This value is shown in either metric or imperial units depending on which mode is selected as indicated by the FT or M symbol to the right of the current depth value In metric mode the value is show to the nearest tenth 0 1 of a meter when in imperial mode the value is shown to the nearest foot This value will flash whenever the maximum rated depth 40 m is exceeded Figure 3 21 Current depth Figure 3 22 Vaximum depth ceiling Figure 3 23 Display indicating ceiling amp Total decompression Figure 3 24 Depth to which it is safe to ascend amp total decompression time
77. he Poseidon MkVI electronics will continue to function indefinitely ensuring a life sustaining gas mixture is maintained in the breathing loop until the following four conditions have all been met the depth is 0 the back of the Primary Display where the wet switch contacts are located has been dried the pressure in the diluent regulator and hoses has been vented and the mouthpiece valve has been placed in the Open Circuit position Once these four conditions are met the system will vent the oxygen gas supply system and power down the electronics The recommended sequence of steps for the proper post dive shut down procedure is as follows e Ensure mouthpiece is the Open Circuit position as it should always be when not in use e Turn off BOTH gas supply cylinders e Thoroughly dry the back face of the Primary Display in the vicinity of the wet switch contacts e Vent the diluent gas from the system by pressing the manual purge button on the ADV POSEIDON MKVI USER MANUAL Safe diving with the Poseidon MkVI NEVER hold your breath when breathing underwater ALWAYS change the CO absorbent cartridge whenever the oxygen cylinder is refilled or replaced ALWAYS remove the sponge from the top of the CO absorbent cartridge after every dive and squeeze as much moisture out of the sponge as possible It is extremely important to allow this sponge to dry as much as possible before starting a new dive If the mouthpiece vibra
78. he reason the breathing hoses use radial seals for example so that you can adjust their positions and that of the mouthpiece without having to make and Figure 1 11 ypical Radial type o ring seal break the connections Radial o ring seals still require a retainer to prevent them from accidental disassembly during diving For hose connections we use rotating shells whose threads engage a capture thread on the mating part see Figure 1 11 for example For face and radial o rings to properly work the diver is responsible for ensuring the following e The o ring is clean and free of debris and scratches no cuts gouges dust dirt sand hair etc e The o ring is lubricated with an approved o ring grease e The sealing surfaces are clean and free of debris scratches and gouges e The sealing surfaces are lubricated with an approved o ring grease Figure 1 10 e The retainer mechanism e g hand screws hand nuts or threaded shells is securely Typical Face type o ring seal in place Face o ring seal POSEIDON MKVI USER MANUAL Cylinders and regulators The Poseidon MkVI EU version only is factory issued with two 3 liter aluminum cylinders with Poseidon post style valves see Figure 1 12 The oxygen cylinder has a white valve knob and the diluent cylinder has a black valve knob Both cylinders are pressure rated to 204 bar 3000 psi service pressure However the specified maximum safe FILL pressure for
79. how the rig and you behave during a dive A Windows based MkVI dive log reviewer are available as a download from Poseidon www poseidon com In general the unit will store approximately 20 hours of dive time more if the dives were of a simple nature with uncomplicated profiles Examples of the common types of data you can review are battery information dive time and depth However the dive log contains much much more information http www poseidon com support discovery O ring care and maintenance The Poseidon MkVI is a computer controlled precision underwater instrument Its Successful continued operation depends upon preventing water from entering the breathing loop gas processor and electronics systems To do this and to keep the rig modular and easy to use and maintain there are dozens of o ring seals These fall into two design classes axial o ring seals and radial o ring seals Figure 1 10 shows a typical use of a axial o ring seal as used POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 9 in the CO absorbent cartridge lid Axial o rings are laid into an annular groove in the body of the object to be sealed The object is then pressed perpendicularly agains a flat clean sealing surface The axial o ring is then compressed along its top side by the flat mating surface and compressed into the groove This compression of the o ring causes it to seal against the sides of the groove and to the flat mating surface Because a
80. hypoxic a failure of this test more likely indicates a failed oxygen sensor and or a broken wire This test does not ensure proper function of the sensor verified during the calibration routine t34 Depth Temperature Sensor Validation This test ensures that the temperature sensor embedded in the depth sensor is working correctly ERROR CODE 11 Current too low 12 Current too high 14 Locked on 15 Locked off 16 Defective 1 7 Locked on 18 Locked off 19 Defective 26 Voltage low 2 Voltage very low 26 Voltage low 2 Voltage very low 31 Sensor Suspect APPENDIX PAGE 74 SOLUTION 1 Standard Response 2 If test failure persists or the Audio Alarm speaker does not sound during this test contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists contact an authorized Poseidon Service Center for repair 1 Inspect the primary oxygen sensor the wires leading from it and the electrical contacts at the back of the sensor cavity and replace the sensor and or wires if either are suspect 2 Standard Response 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Inspect the secondary oxygen sensor the wires leading from it and the electrical contacts at the back of the sensor cavity and replace the sensor and o
81. idon MkVI stores decompression data in two places the battery and the main backpack computer This allows a diver to switch to a spare battery while maintaining decompression in the rebreather unit or switch rebreather units and transfer the active decompression data with the battery Test 40 Tissue Tension Test compares the stored decompression information in both the battery and in the main backpack computer If the two decompression states do not exactly match on a compartment for compartment level test 40 will fail Failure of this test is a notification to the diver that the system has detected this discrepancy between the two sets of decompression data Re start the pre dive test POSEIDON MKVI USER MANUAL The most common cause for this test failure is when a diver inadvertently inserts the wrong battery into the Poseidon MkVI unit As with any test failure the LCD will flash the test number and error code for five seconds If the mis match was unintentional the diver should replace the battery with the correct one for the rebreather unit being used If the mis match cannot be corrected then upon activating the wet switch the next time the system will resolve the decompression difference by selecting the most conservative value for each compartment of the decompression algorithm Open circuit mouthpiece position test 43 Test 43 mouthpiece OC position test is automatically passed provided the mouthpiece was left in the OC posi
82. igure 1 18 CHAPTER 1 Checkvalve port Figure 1 18 Clockwise tighten the water diversion manifold into the right and left counterlung shoulder port PAGE 16 POSEIDON MKVI USER MANUAL Figure 1 19 shows a cross section of the water diversion manifold A quick inspection will show that on one side the front you can insert a finger and feel an open vertical tube leading down to the threaded counterlung connection post see Figure 1 19 If you insert a finger through the other side the back you will feel an interior convex cylindrical surface blocking entry In order for the water diversion manifolds to work properly we recommend that you align the gas diversion mainifolds to follow the direction of the airflow in the loop i e that the front of the mainfold on the exhalation lung is pointing towards the mouthpiece and that the front of the manifold on the inhalation lung is pointing towards the canister housing Insert one of the water diversion manifolds they are identical into the top port of the right counterlung Figure 1 18 Inspect the o ring and sealing surfaces and be sure both are clean and lubricated Carefully screw the manifold into the port taking care not to cross thread the connection post and port threads Carefully observe the radial o ring as you make the connec tion to make sure the o ring does not pop out of its groove Screw the manifold all the way down with a clockwise rotatio
83. ion lung closed Are all loop hoses connected Are all o rings in the loop undamaged Are all O rings in the loop mounted correctly Is there any visible damage to the unit Did the loop pass a negative loop test Are the lungs empty when the PPLT starts Is the bottom plate of the canister housing properly assembled with all four screws Is the mouthpiece leaking The PPLI is a very sensitive test where the unit looks for changes in pressure in the loop A failed PPLT can be caused by one or both lungs being pressed by the mouthpiece or any other part of the unit Make sure that the lungs are kept free from any external pressure during the PPLI We know from experience that almost all failed PPLT are caused by improper assembly of the loop Proper assembly of the loop regularly lubricating o rings in the loop and making sure that the OPV valve on the exhalation lung is closed rinsed with fresh water and cleaned will minimize the risk of failing on test 49 Error on test 53 Test 53 is the oxygen sensor calibration test and this is quite complicated and based on a lot of factors such as Temperature of the sensors Percentage of oxygen in the gases used Response time from a sensor Milli voltage of a sensor APPENDIX PAGE 69 The test will start by injecting pure oxygen directly on the primary oxygen sensor for 20 continuous seconds After the calibration constants for oxygen are established the
84. ip the threads Great force is not required to seal the module WARNING Deep permanent scratches cuts gouges or other damage to the polished radial sealing surfaces of the electronics module and or failure to ensure that all electronics module o rings are in place free of debris and are lubricated could lead to water entry into the top of the cartridge housing during a dive eventually causing a lock up of the breathing loop and forcing an immediate open circuit abort to the surface PAGE 22 CHAPTER 1 Outer radial seal em SEH H W a A S A Inner radial seal re j Outer radial sealing surface Inner radial sealing surface Figure 1 31 Firmly screw down the hand nut on the right and the left side of the electronics housing use NO processor housing tools Figure 1 30 Align the cable junction box with the front of the gas processor closest to backpack then insert the electronics module innto the DANGER The electronics module contains the most important life critical element of the Poseidon MkVI the oxygen sensors A leak into the electronics housing may contaminate the oxygen sensors and prevent them from providing correct readings Dual radial o rings help to guard against this and the computer system is programmed to discover anomalies in the oxygen sensors and to attempt to repair the situation Detection of an oxygen sensor anomaly will lead the computer to
85. ir POSEIDON MKVI TH Time SEC 29 30 31 34 35 38 4 5 Go 1 9 USER MANUAL DESCRIPTION Audio Alarm Speaker This test measures the amount of elec trical current consumed by the speaker in the battery Audio Alarm when activated Oxygen Cylinder Pressure Sensor Validation This test includes a series of tests that confirm that power can be supplied to the oxygen cylinder pressure sensor and that the signal from the sensor is within limits regardless of whether the cylinder valve is turned on Diluent Cylinder Pressure Sensor Validation This test includes a series of tests that confirm that power can be supplied to the diluent cylinder pressure sensor and that the signal from the sensor is within limits regardless of whether the cylinder valve is turned on Primary Oxygen Sensor Validation This test measures the voltage output from the primary oxygen sensor to ensure it exceeds a minimum threshold value Although it is possible that the gas mixture in the breathing loop is hypoxic a failure of this test more likely indicates a failed oxygen sensor and or a broken wire This test does not ensure proper function of the sensor verified during the calibration routine t34 Secondary Oxygen Sensor Validation This test measures the voltage output from the secondary oxygen sensor to ensure it exceeds a minimum threshold value Although it is possible that the gas mixture in the breathing loop is
86. is to make sure that the breathing loop is intact and not leaking Water entry into the breathing loop can cause serious problems if mixed with the CO absorbent material in the cartridge As discussed earlier in this Chapter a manual negative pressure loop test can help detect leaks in the breathing loop Another common test is the Positive Pressure Loop Test PPLT which is similar to the Negative Pressure Loop Test except the test is performed by pressurizing the breathing loop with positive pressure Like the Negative Pressure Loop test this test could very easily be performed manually However one of the features of the Poseidon MkVI the placement of the depth sensor within the breathing loop allows this test to be performed automatically And so it is in Test 49 Figure 2 9 Test 49 actually performs four separate tests only one of which is the PPLT The other three are e Verifies depth sensor is sensitive to small pressure changes e Verifies that both metabolic oxygen solenoid valves are injecting gas e Tests for leaks in all four solenoid valves POSEIDON MKVI USER MANUAL Before reaching this test indeed before Powering up the electronics it s important to make sure that the over pressure relief valve on the bottom of the right exhale counterlung is adjusted to the full clockwise position Ae mentioned previously the mouthpiece should be in the OC position and the oxygen cylinder should be turned on Also the
87. ise the diver to switch from closed circuit to open circuit mode or vice versa The HUD also contains a sophisticated sensor to detect which position the mouthpiece is in closed circuit or open circuit CHAPTER 1 Mouthpiece switch in closed circuit position Figure 1 3 Mouthpiece open amp closed circuit switch and Heads up display HUD ADV PAGE 2 POSEIDON MKVI USER MANUAL Electronics module Diluent regulator Oxygen regulator Diluent cylinder valve Oxygen cylinder valve Oxygen high pressure sensor Diluent high pressure sensor Right rear breathing hose Left rear breathing S connection hose connection Diluent cylinder Oxygen cylinder Smart battery Tank connection Gas injection block bracket Carbon dioxide CO removal cartridge housing Cylinder connection bands Figure 1 4 Back view of Poseidon MkVI CHAPTER 1 PAGE 3 Breathing loop overview The most visible elements of the front portion of the Poseidon MkVI comprise the breathing loop breathing hoses convertible open and closed circuit mouthpiece with built in automatic diluent addition valve ADV water diver sion manifolds sometimes referred to as T ports or Shoulder Ports and the left inhalation and right exhalation counterlungs The breathing loop is a compliant system its volume changes in response to breathing Its purpose is to provide an external reservoir for the exhaled
88. lanned to avoid potential problems with the oxygen sensors It is also good practice to rinse disinfect and dry the absorbent sponge following a dive Any disinfectant solution that doesn t have a negative effect on plastics and or rubber can be used for this purpose Poseidon recommends using a Figure 1 49 Remove the End Plate Figure 1 50 Remove the Absorbent Cartridge disinfectant called Gigasept or a disinfectant called Virkon POSEIDON MKVI USER MANUAL DANGER Dangerous levels of carbon dioxide CO can cause symptoms that include but are not limited to rapid breathing severe headache tunnel vision and disorientation High CO levels can also increase the potential for oxygen toxicity Diving a closed circuit rebreather with an expended CO absorbent cartridge could lead to serious injury or death When in doubt switch the mouthpiece to open circuit mode and end the dive immediately Next remove the black top of cartridge interface cap Figure 1 51 and clean disinfect dry and stow that component Note that this cap is fitted with two o rings a top mounted axial o ring that seals to the interior top of the cartridge housing and a radial o ring that seals to the top receiver pocket on top of the CO absorbent cartridge Replace these o rings if cuts or gouges are present Remove the pre packed absorbent cartridge Figure 1 52 from the base plate and properly dispose of the cartridge Replacements discussed belo
89. leshooting guide This Appendix provides detailed information on possible problems that may occur when pre paring or using the Poseidon MkVI for diving It is divided into two main sections The Auto matic Pre Dive Tests and Hardware Issues The Automatic Pre Dive Test section includes all of the automated tests according to each test number with a description of what is being tested and the possible failure modes as well as possible causes and solutions The Hardware Issues section discusses various problems that can occur with the mechanical aspects of the MkVI and how to correct them Many of the problems in both sections can be easily solved by the diver but some require repair at an authorised Poseidon Service Center Never tamper with bolts or screws this may permanently destroy the unit This is due to that the inernal cavities is filled Do not try to alter the clock setttings to bypass service intervals etc This may set the unit in an un operable state Automatic ore dive test As described in Chapter 2 of the Manual the Poseidon MkVI electronics automatically conduct a series of tests whenever the system is powered up i e whenever a battery is inserted into the electronics module or the wet switch on the back of the Primary Display is activated While these tests are running the test number is shown on the left side of the Primary Display where the depth is normally shown and the test number is preceeded by a lower case
90. lified service center Failure to comply with these instructions could lead to an oxygen fire and may cause serious injury or death The Poseidon MkVI requires proper pre dive setup and several important verification procedures that must be carried out by the diver Details of these procedures are included in Chapters 1 and 2 of this Manual The MkVI also incorporates many auto matic system tests as part of the power up procedure Using the MkVI without com pleting these automatic system tests poses significantly increased risk to the diver POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE VII Chapter 3 of this Manual describes procedures for donning and fitting of the MkVI to ensure proper positioning on the diver as well as instructions for proper use while conducting a dive Chapter 4 of this Manual describes appropriate post dive procedures and long term storage and maintenance requirements for the Poseidon MkVI including conditions for storage shelf life of certain components and appropriate precautions as well as a maintenence and inspection schedule Failure to comply with these procedures may result in deteriorated and or damaged components and can lead to improper functioning of the equipment A separate set of instructions detailing maintenance requirements is also provided for reference purposes 8 4 The diluent cylinder for the Poseidon MkVI should only be filled with Grade E or equivalent air The oxygen cylinder should
91. lute the oxygen when Filling your own cylinders is dangerous business You are mixed in the breathing loop This diluting characteristic is a requirement of a closed circuit personally responsible for your well being and those around you rebreather because oxygen is toxic at partial pressures greater than 1 6 bar 2 ATM If one when you fill your own cylinders Before you consider this option were only using pure oxygen in a rebreather the safe operating depth would be limited to 6 obtain formal training on the operation of the equipment and in meters 20 feet underwater Another characteristic of a suitable diluent gas is that it is normally the maintenance of oxygen clean systems Never overfill any selected so that it is directly breathable as an open circuit gas at the maximum operating Poseidon MkVI cylinder oxygen or diluent Service all equipment depth of the rebreather General examples of diluent gases that can be used in rebreathers per the manufacturer s recommendations include air nitrox trimix and heliox The MkVI is limited to 40m 130 feet depth and uses only air as an allowed diluent following established compressed air scuba sport diving practices The decompression algorithm requires that air be used as the diluent in the Poseidon MkVI Poseidon MkVI cylinders both oxygen and diluent should be filled by a qualified facility that is properly trained and equipped to fill such cylinders The requirements concerning maintenance of
92. mated and semi automated tests during the pre dive routine This procedure verifies a wide variety of parameters and takes about 3 minutes to complete A full description of all of the tests is included in Appendix 1 of this Manual but a general description including tests that require intervention is included here Although there are 55 tests the display only shows 36 of them because several test numbers are reserved for future tests Note that if the depth is greater than zero the system automatically shifts into Dive Mode and alerts the diver to abort the dive due to a failure to complete the ore dive routine Figure 2 4 The Primary Display showing d all LCD elements DANGER Do not attempt to breathe on the Poseidon MkVI during the automated pre dive routine Oxygen control is disabled during portions of this routine so doing so involves a risk of hypoxia Do not attempt to conduct a dive until the system has successfully completed the pre dive routine CHAPTER 2 PAGE 40 Power up self test test 1 55 The first series of tests numbers 1 55 are referred to as Power Up Self Tests or PSTs They are internal checks on the functionality of all of the various sensors computers actuators and alarm systems in the Poseidon MkVI You will see and hear the rig as it tests the HUD light and vibrator and the battery lights and speaker systems Similarly you may also hear the rig opening and closing some of the ga
93. n sensor to the oxygen sensor base by screwing it into place Make sure the o ring around the base of the threads on the oxygen sensor is clean and free of any damage and that it seals properly when the sensor is screwed down snugly Oxygen sensor serial number Oxygen sensor base CHAPTER 4 PAGE 65 Once the sensor is properly attached to the sensor base the electrical connector on the elec tronics module should be attached to the sensor The sensor has three electrical contact pins in a straight row parallel to a flat plastic guide tab Hold the connector so that the three contact holes line up with the three pins on the sensor and the two plastic pins on the connector straddle the flat guide tab Carefully push the connector without bending any of the pins until it is completely seated Electrical connector Oxygen sensor Figure 4 5 The oxygen sensor is attached to the sensor base by threads sealing by anio ring POSEIDON MKVI USER MANUAL With the electrical connector properly attached to the sensor inspect the two radial o rings on the oxygen sensor base to make sure they are clean and free of any damage Ensuring that the electrical connector is still firmly attached slide the sensor into the electronics module with the flat part of the outer edge of the sensor base facing towards the top of the electronics module Figure 4 6 Carefully press the sensor into the electronics module until it is firmly se
94. n the Primary Diplay see Chapter 3 Hose Detached from Fitting One of the breathing hoses becomes detached from the fi tting mounted at the end of the hose Cracked Absorbent Cartridge The plastic housing of the SofnoDive 797 CO absorbent cartridge can sometimes develop a crack if it is dropped or due to mishandling during shipment Counterlungs Shift Position Underwater The counterlungs may shift position underwater floating up above the diver s shoulders or squeezing the diver s neck Misaligned Cylinders If the cylinders are not attached to the backpack at the same height the rig will wobble back and forth and be unstable when standing upright Leaking Fittings A small stream of bubbles may be seen eminating from one or more of the fi ttings on the open circuit mouthpiece supply hose the hoses that connect the fi rst stage regulators to the pneumatics block on the electronics module or from one of the high pressure sensors PO2 Setpoint Limited to 1 0 bar atm The system is confi gured for a deep PO2 setpoint value greater than 1 0 bar atm but the setpoint never increases above 1 0 bar atm even when the depth is greater than 15117 50 Ti SOLUTION 1 Ensure that the mouthpiece is fully in the OC or CC position Sometimes requires firm oressing on the mouthpiece lever 2 Ensure that the HUD is properly positioned on the top of the mouthpiece and that the exhaust cover is holding it tightly in place
95. n until the o ring is fully engaged with the radial sealing surface of the counterlung port Verify that the front of the water diversion manifold is pointed forward so that the hose connecting the mouthpiece attaches to the front side of the diversion manifold If the manifold is not oriented correctly unscrew the manifold counterclockwise just until the front aligns in the proper direction always be less than one full rotation When you have completed installation of the two water diversion manifolds in to the top port of both counter lungs it should look as shown in Figure 1 20 Airflow Figure 1 19 Cross section of the water diversion manifold Right T Connection Water flow To counterlung Airflow Water CHAPTER 1 PAGE 17 OF of Figure 1 20 The recommended alignment of the two water diversion manifolds when installed on the counter lungs POSEIDON MKVI USER MANUAL 5 Rear CC loop hoses Figure 1 21 Insert the rear left and right hose into the gas processing house Breathing loop All of the components of the breathing loop discussed in this section were first introduced in Figures 1 1 and 1 4 above It is useful to note that all breathing hoses and hose fittings are identical There are a total of eight 8 hose connections to be made in the assembly of the Poseidon MkVI Assembly of these hoses starts at the gas processor and continues forward to the mouthpiece CHAPTER 1 PAGE 18
96. nce CO Absorbent Cartridge Follow the procedures described in Chapter 1 for installation of a new SofnoDive 797 CO absorbent cartridge When conducting a repetitive dive It s critical to keep track of the hours of personal use for the cartridge once it is installed The absorbent cartridge must be changed whenever the oxygen cylinder is re filled While many people experience a strong reaction to CO buildup as would result from diving with a depleted or missing cartridge in the form of un naturally rapid breathing rate disorientation and the onset of a strong headache some people do not experience them Do not risk CO poisoning Change the cartridge every three hours of use or whenever the oxygen cylinder is recharged whichever comes first POSEIDON MKVI USER MANUAL WARNING Always replace the CO Absorbent cartridge with a new un used absorbent cartridge whenever the oxygen cylinder is re filled This will minimize the risk of CO poisoning Intact Breathing Loop Verification Inspect all breathing hose connections to ensure that they are properly attached The attachment nuts should be hand tight and the nuts should be screwed down flush against the receiver manifolds in all 8 locations two at the top of the gas processor four at the shoulder ports and two at the mouthpiece Also at this time make sure the right counterlung dump valve is fully closed turned all the way clockwise This is important for the pre dive
97. nd the 11 inch adapter are both sold separately and _are not included in the Poseidon MkVI The pre packed scrubbers are consumables and are _sold separately and not included in the MkVI POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 14 2 Tank band Figure 1 14a Tank band newer type The tank band buckles should be aligned so that they are folded backwards when the tank is securly locked in place Thread the tank band through the tank band bracket from the back towards the front Thread the tank band buckle D ring on to the tank band Figure 1 14b Tank band older type Thread the tank band through the tank band bracket and in to the buckle see figure Fold the tank band and thread it back through the same opening on the tank band bracket Adjust the length of the tank band so it fits on the tanks you intend to use with your Poseidon MkVI Properly adjusted the tanks should be firmly attached not being able to move in the tank band when the buckle is closed and secured around the tank Adjust the length of the tank band so it fits on the tanks you intend to use with your Poseidon MkVI Properly adjusted the tanks should be firmly attached not being able to move in the tank band when the buckle is closed and secured around the tank Thread the tank band through thin webbing strap loop counterlung strap POSEIDON MKVI USER MANUAL 1 Stabjacket BCD Wing Attach the ca
98. ne Battery EEPROM This tests the EEPROM static memory in the battery processor which contains user selectable con figuration information for internal errors or data corruption Battery Data logger This test ensures that the data log circuitry in the Battery is functional and accessible Firmware Version Compatibility This test compares the versions of firmware installed on each of the system proces sors and ensures they are compatible with each other Battery State of Charge This tests the circuitry that calculates the State of Charge SoC for the battery by measuring the base level electrical current consumed by the electronics Many of the tests that follow this test rely on an accurate SoC calculation Primary Display Backlight This test measures the amount of electrical current consumed by the backlight of the Primary Display when the backlight is turned on with maximum bright ness After this test has completed the backlight remains on for the remainder of the tests ERROR GODE 6 Bad EEPROM 4 Bad RAM 5 Bad Fuse 3 Bad ROM 6 Bad EEPROM 13 Bad Chip 7 Battery Mismatch 8 Non Batt Mismatch 9 Current too low 10 Current too high 11 Current too low 12 Current too high APPENDIX PAGE 72 SOLUTION 1 Standard Response 2 If test continues to fail reset system parameters 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response
99. ner and outer radial sealing surfaces in the electronics module receiver pocket at the top of the gas processor see Figure1 30 These surfaces should be free from scratches gouges and dings Ensure that these surfaces have a smooth application of lubricant and that no debris dust or other foreign material is present Inspect both inner and outer electronics module radial o rings Figure 1 30 If any of the O rings are damaged cut or gouged replace them Ensure that each o ring is lubricated and that there is no debris dust sand etc on any of the o rings Orient the electronics module such that the cable entry port is aligned towards the front of the gas processor as shown in Figure 1 30 and carefully press the electronics module into the receiver pocket in the top of the gas processor housing as shown in Figure 1 30 Be sure when inserting the electronics module into the open receiver cavity at the top of the gas processor that the radial o rings do not extrude from their circular grooves The radial O rings in the electronics module should insert smoothly into the gas processor receiver cavity until they are no longer visible and the under side lip of the electronics module fastener hand nut flange is flush with the top ledge of the gas processor receiver cavity see Figures 1 30 and 1 31 for proper seating of the electronics module Tighten the left and right retainer hand nuts as shown in Figure 1 31 Do NOT use tools or you may str
100. ng hose to the front port of the right counterlung water diversion manifold Figures 1 43 All of the previously mentioned Connect the right front CC loop hose to the exhalation counter lugn T connection practices concerning inspection and lubrication of o rings and o ring receiving surfaces apply Hand tighten the hose retainer nut as shown in Figure 1 43 Use NO tools Repeat this process for the left front breathing hose attachment to the front port of the water diversion manifold for the left counterlung The result should now appear as shown in Figure 1 42 Retainer nut capture thread Sealing surface for radial o ring seal Radial o ring seal Figure 1 43 Hand tighten clockwise the swivel nuts for the front breathing Figure 1 42 Breathing hoses properly connected onto the water diversion manifolds hoses at the front shoulder ports DO NOT use tools or over tighten POSEIDON MKVI USER MANUAL 12 Front CC hoses to mouthpiece Make sure that the in and exhalation check valves are installed in the mouthpiece in their correct position Make sure the check valves are undamaged that they aren t folded in any way and that they are clean Make sure you have the mouthipece in the correct position Connect the front left CC loop hose to the inhalation side CC loop hose connection of the mouthpiece Connect the front right CC loop hose to the exhalation side CC loop hose connection of the mouthpiece Figure 1 44
101. ng strap on the other counterlung These two keep the counterlungs held together It is well worth the time spent in shallow water making adjustments to these various straps until the counterlungs fit comfortably and closely to the upper chest and shoulders The better the counterlung adjustment the easier the breathing will De when underwater POSEIDON MKVI USER MANUAL Tips on breathing Breathing underwater on a closed circuit rebreather such as the Poseidon MkVI is somewhat different from breathing on land or breathing with conventional scuba gear As the diver exhales the counterlungs both expand As the diver inhales the counterlungs contract The direction of gas flow through the breathing loop is governed by the two check valves in the bottom portion of the mouthpiece The incorporation of two separate over the shoulder counterlungs on the MkVI helps to minimize the effort required to breathe underwater but there are a few tips that make breathing easier The most important thing is to maintain an optimum volume of gas in the breathing loop If there is too much back pressure when exhaling often felt in the cheeks or if the overpressure relief valve on the exhale left counterlung burbs gas at the end of an exhaled breath then the loop has too much gas and some should be vented e g by exhaling through the nose If the counterlungs bottom out and or the Automatic Diluent Valve ADV in the mouthpiece is triggere
102. nsiter housing to your stabjacket BCD Wing using either the tank bands or an 11 adapter As previously mentioned the Poseidon MkVI is sold with an optional backpack and buoyancy compensator This is to allow more experienced divers the choice of using an existing personal backpack harness and buoyancy compensator Poseidon supplies the tightly integrated Besea harness and buoyancy wing system for use with the MkVI The front extrusion rail on the Poseidon MkVI accepts the 11 inch adapter see Figure 1 13 Attachment of the Besea is as quick as aligning the 11 inch adapter pin bolts to the upper holes in the Besea harness as shown in Figure 1 13 Make sure that you have correctly adjusted the length size of the Besea harness back plate before aligning the 11 inch adapter Once the correct alignment of the 11 inch adapter pin bolts have been found secure the 11 inch adapter position on the front rail of the Poseidon MkVI The optional buoyancy compensator wing can be quickly attached or removed from the Besea harness using the four guide pins attached to the eight attachement bolts on the back of the Besea harness The Besea comes with a convenient carrying handle that can be used to transport the entire assembled Poseidon MkVI to and from the dive preparation area You can attach a Poseidon MkVI to your BCD Stabjacket using a tank band BCD Stabjacket using an 11 adapter If your BCD Stabjacket is equipped with a mounting poin
103. ntact an authorized Poseidon Service Center or dive shop for repair This situation occurs when the Hyperoxic Linearity Test fails or has not been completed This test is performed the fi rst time the depth reaches 6 m 20 ft and setpoint values greater than 1 0 bar atm are not allowed until after this test has been performed and passes See Chapter 3 of the Manual APPENDIX PAGE 78
104. ntain a breathing gas mixture representing an inspired oxygen partial pressure of between 0 5 bar 0 35 bar minimum and 1 2 bar 1 4 bar maximum The oxygen fraction of the mixture depends upon depth and set point At the surface the oxygen fraction will vary from 35 to 100 and the nitrogen fraction from 65 to 0 At the maximum operating depth of 40 msw the oxygen fraction will vary from 20 set point 1 0 to 28 set point 1 4 and the nitrogen fraction will vary from 80 set point 1 0 to 72 set point 1 4 Users must monitor displays and alarm systems and respond appropriately if oxygen concentrations become unsafe The Poseidon MkVI requires the monitoring of a backlit liquid crystal display LCD screen and thus should only be used when water visibility exceeds approximately 30 centimeters Using the MkVI in visibility conditions that prohibit viewing of the LCD screen poses increased risks of operation The Poseidon MkVI incorporates high pressure oxygen as one of its supply gas mixtures and uses equipment that has been cleaned and prepared specifically for use with high pressure oxygen Appropriate care must be taken when handling such mixtures especially when filling cylinders and providing proper maintainance and oxygen compatible cleanliness for all components exposed to high pressure oxygen Components exposed to high pressure oxygen e g the oxygen regulator and associated pneumatic Components must be serviced by a qua
105. nterface is a large format flat screen panel that displays all you need to know about consumables management cylinder pressures dive time depth oxygen level and it incorporates a sophisticated resource algorithm that monitors all systems for you and tells you when its time to head up If things are not going correctly for whatever reason the MkVI has audible tactile and visual warning systems to get your attention and to advise your diving partner of your status 1 Unlike open circuit scuba the rate of gas consumption on the Poseidon MkVI does not depend on the depth of the dive Instead the oxygen supply depends on how fast the diver consumes oxygen through metabolism Divers with large muscle mass and or working hard underwater will consume oxygen faster leading to shorter total dive times Conversely smaller divers with less muscle mass or relaxed divers who are not working hard will gain significant improvements in dive duration CHAPTER 1 PAGE V Switchable mouthpiece in a significant new patented design the Poseidon MkVI gives you the ability to switch from closed circuit to open circuit operation in one easy motion without the need to search for a spare mouthpiece in an emergency The ultra compact switchable mouthpiece is lightweight and easy to breathe giving you high performance in both open circuit and closed circuit modes The MkVI mouthpiece also combines in the same housing a pressure balanced Automatic
106. oad the Dive log from the dive in question e Contact the dive center dealer where you purchased your Poseidon MkVI and e mail them the Red Box Log file s and dive log s you have downloaded from your MkVI If you are asked to send in your e module for repair analysis please send the following parts e Electronics module with primary display HUD and HP sensors e Battery e Oxygen sensors POSEIDON MKVI USER MANUAL APPENDIX PAGE 71 Always ensure that battery is adequately charged but not over charged before attempting automatic pre dive routine The standard response to any test failure should be an attempted reboot Repeated failures of the same test including Error Code 0 may sometimes be solved by removing the battery placing it on the charger for a few minutes then re inserting on the electronics NEVER remove the battery until after the system has powered down Time values are maximum seconds allowed for each test TH TIME SEC SOLUTION DESCRIPTION ERROR GODE 1 1 9 System Data Log Integrity Test This test ensures that the data 2 Bad Chip 1 Standard Response 2 If test failure persists contact an authorized log circuitry in the Primary Display is functional and accessible Poseidon Service Center for repair 2 Display ROM RAM Fuses This tests the RAM ROM and 4 Bad RAM 1 Standard Response 2 If test failure persists contact an authorized fuse settings of the electronics in the Primary Display The 5 Bad Fuse Posei
107. p radial o ring does form an important seal so take extra care to make sure the seal is snug and reliable Figure 1 58 this is the reverse of the procedure shown in Figure 1 51 above Inspect the radial sealing surface at the bottom of the cartridge housing Figure 1 59 This surface should be free from scratches gouges and dings Ensure that this surface has a smooth application of lubricant and that no debris dust or other foreign material is present POSEIDON MKVI USER MANUAL The importance of ensuring that all exposed o rings and their respective sealing surfaces are smooth and clean cannot be overstated Careless treatment of these o rings could cause an an entry path for water into the system leading to an aborted dive or worse A slow leak may represent a minor inconvenience but may eventually lead to more severe problems later A fast leak could lead to an immediate requirement for an open circuit abort to the surface O rings and their sealing surfaces are at the heart of reliable operation of the Poseidon MkVI Pay attention to this detail when you assemble the rig Je e 2 Es sl E Se E w a e be a Zen A Figure 1 60 nsert the CO absorbent stack CHAPTER 1 PAGE 34 Insert the assembled CO absorbent stack into the cartridge housing see Figure 1 60 Take care during the final stage of assembly to align the four hand nuts with their respective threaded connectors on the extruded cart
108. period of time would be to top off the charge once a month by running it on the normal charge cycle in the desktop charger If this is not possible then the best long term solution is to leave the battery on the charger with the power to the charger turned on The method of monthly top off of charge however will maximize the battery life Store the battery in a cool dry environment Decompression data In the Poseidon MkVI rebreather individual user decompression data are stored in both the backpack computer and the smart battery computer Thus every user carries their decom oression information with them when they remove the battery If the same user dives the same rig then the diver will receive repetitive dive surface credit for the time spent on the surface even if the battery is removed from the rig between dives The decompression algorithm is a 9 compartment real time implementation of the industry proven DCAP decompression engine It is strongly recommended that you use the same battery in the same Poseidon MkVI for any repetitive series of dives Once sufficient surface credit has cleared the decompression model entirely generally 24 hours of no diving then you can swap batteries between rebreathers without risk POSEIDON MKVI USER MANUAL DANGER Ifa user swaps batteries with another Poseidon MkVI unit than the one they were diving and if they incurred a decompression debt and if the battery computer memory storing the
109. post Figure 1 7 Left Align the retainer screw posts on the Smart Battery with the receiver slots at the top of the Electronics module note that the 4 contact pins in the housing must align with those on the battery Right push the battery into the slot engaging the pins and the radial o ring seal until an audible snap is heard as the safety latch closes Figure 1 8 Removing the smart battery POSEIDON MKVI USER MANUAL Charging Included with the Poseidon MkVI is a proprietary multi function desk top charger unit that includes adapters for most international power outlets The battery charger has three status lights arranged in a circular pattern on the open section of the base These are in counter clockwise order from the lower left in Figure 1 9 power Learn Cycle status and charge status Power Indicator Light When green the power is on and the charger is ready to operate If it occasionally blips the charger does not have external power and is actually draining the battery Learn Cycle Indicator Light The middle light indicates the status of a Learn Cycle The battery has its own onboard computer that monitors the state of charge Over a period of weeks to months the computer s estimate of the remaining power in the battery gradually decreases in accuracy The computer can re learn what a full 100 charged battery should look like using the Learn Cycle of the charger The ba
110. r right corner of the primary display where the elapsed dive time is normally shown 67 Primary Dil Low 68 Primary Dil High 72 Primary O2 Low 73 Primary O2 High 76 Bad Time Constant 69 Secondary Dil Low 70 Secondary Dil High 74 Secondary O2 Low 75 Secondary O2 High 7 Not in CC Mode 81 Servicing Required Replace Primary oxygen sensor with a known good sensor 2 Ensure E absorbent cartridge is installed correctly 3 Ensure breathing loop tem perature is within range limits 4 If test failure persists contact an authorized Poseidon Service Center for repair 1 Replace Secondary oxygen sensor with a known good sensor 2 Ensure CO absorbent cartridge is installed correctly 3 Ensure breathing loop temperature Is within range limits 4 If test failure persists contact an autho rized Poseidon Service Center for repair 1 Ensure that the mouthpiece is FULLY in the CC position sometimes requires firm pressing on the mouthpiece lever and that the HUD is properly positioned on the top of the mouthpiece Contact an authorized Poseidon Service Center for servicing POSEIDON MKVI USER MANUAL CATEGORY Mouthpiece Breathing Hoses Absorbent Cartridge Counterlungs Cylinders Pneumatics Electronics DESCRIPTION HUD Seating If the Head Up Display becomes unseated or out of alignment there may be frequent failures of Pre Dive Test 28 or 33 or errors concerning No Circuit nc o
111. r wires if either are suspect 2 Standard Response 3 If test failure persists contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test continues to fail ensure loop temperature is within limits 3 If test failure persists contact an authorized Poseidon Service Center for repair POSEIDON MKVI TH Time SEC 40 43 44 45 48 2 120 120 120 USER MANUAL DESCRIPTION Decompression Status Verification In this test the two sets of decompression data one stored in the rig electronics and one in the battery are validated and compared see relevant discussion in Chapters 1 amp 2 In addition to comparing and validating the two sets of tissue tension data this test also compares the serial numbers of the battery and the main elec tronics as well as the time stamp on both Mouthpiece Open Circuit Position This test requires that the mouthpiece be in the Open Circuit OC position in order to pass During this test if the system does not detect the OC position the red LED and the vibrator on the Head Up Display HUD will pulse continuously to signal the diver to adjust the mouthpiece position Sufficient Oxygen Supply Pressure This test requires that the oxygen cylinder contains sufficient pressure for a dive to be started at least 25 of maximum capacity Sufficient Diluent Supply Pressure This test requires that the diluent cylinder contains sufficient pressure
112. re Figures 1 7 shows the installation procedure for the smart battery The battery contains four female quick connect contact pins mounted on an extended cylindrical o ring sealed post that projects from the end of the battery This mates to a receptacle with four corresponding male fixed pins in the electronics module inside a sealing cavity for the radial o ring seal Be careful not to short the contact pins when the battery is not in the rig and inspect the battery socket receptacle on the electronics module prior to inserting battery to ensure there is no water Once the battery is properly installed in its docking slots and pushed all the way forward an audible CLICK will be heard as the safety latch closes The battery is now ready for diving To remove the battery from the electronics module press the safety latch and firmly push the top part of the battery outward as shown in Figure 1 8 It is usually best to remove the battery when the system is dry to avoid water ingress to the electrical contacts Safety The smart battery uses a high energy density lithium ion rechargeable battery similar to bat teries used in laptop computers If any liquid or discoloration is observed inside the clear plastic battery housing dispose of the battery immediately Disposal of an old or failed smart battery should be in accordance with local laws regarding disposal of Li ion laptop computer batteries CHAPTER 1 PAGE 5 Retainer scr w
113. release of the mating pressure would result in a leak in a face type seal these require a securing mechanism that not only prevents the part from lifting off accidentally but also actively compresses the axial o ring against the flat mating surface In the case of the CO cartridge the cartridge end plate is equipped with four thumb screws to secure it in place and tighten it down A second and more commonly used seal is the radial o ring Figure 1 11 shows a typical implementation in the Poseidon MkVI breathing hose and hose connection ports In contrast to a axial o ring seal a radial seal involves a circular groove that goes around a cylindrical or semi cylindrical object it can be a rectangular object with rounded corners provided the corners have a sufficiently large radius an example of this is the Electronics Module dual radial seals In a radial seal the groove is designed such that the o ring snaps into the groove with a certain pre tension Once seated the o ring cannot leave the groove To complete the seal the side of the connection containing the radial o ring and groove is inserted into a cylin drical receiving surface As the o ring is inserted the cylindrical surface uniformly compresses the radial o ring and creates the seal against all contacting surfaces The important distinction is that with a radial seal it is possible to rotate the objects relative to one another and still retain a good waterproof seal This is t
114. ridge housing There is only one possible orientation in which all four screws will align with those on the housing Be sure when you insert the end cap into the cartridge that the radial o rings do not extrude from their circular grooves see Figure 1 61 Once the end cap is pushed in and both radial o rings are no longer visible tighten the four hand nuts alternately one at a time so they seat the cap on evenly Only tighten the screws until the end cap edge is approximately 1 to 2 mm away from the bottom tube edge of the extruded cartridge housing see Figure 1 62 This is anormal gap because the hand nuts are pushing the entire assembly against the top face ring in order to secure the seal of the cartridge stack to the interior top sealing surface of the cartridge housing Compression gap is normally 1 to 2 mm wide after successfull assembly Ensure that o rings do not extrude from their grooves during assembly Figure 1 61 Final insertion of end cap into cartridhe housing Figure 1 62 Tighten the four screws POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 35 If there is no gap between the end plate and the bottom edge of the cartridge housing It likely means that you have forgotten to install the top axial o ring on top of the CO absorbent cartridge If this is the case return to Step 14 above and install the axial o ring then resume Make sure the OPV is in the maximum closed position When your unit has been assembled
115. rly adjusted the Poseidon MkVI should rest easily on the diver s back It should not feel awkward or loose but rather it should be reasonably snug and comfortable Specific strap adjustments will depend on what style of harness is used but each counterlung comes with a set of three straps that can be looped around the harness shoulder straps securing both counterlungs firmly to the diver s upper chest and shoulders When properly positioned both counterlungs should curve over the tops of the shoulders such that the top ends are in line with the diver s back They should hug the diver s body closely and not float up or shift position as the diver swims in different orientations V av ah 4 fs a F did ASP M atitid ITT CHAPTER 3 PAGE 58 Counterlung strap adjustments Besides the three large straps for attachment to the harness each counterlung has several additional straps used to adjust positioning At the top of each counterlung is a single adjust able strap that curves behind the diver s back and attaches to the corresponding cylinder strap This counterlung strap is used to adjust the positioning of the top of each counterlung At the bottom of each counterlung are two more adjustable straps The longer of these angles straight down for attachment to a crotchstrap or a waist strap and is used to keep the bottom of the counterlung securely down The shorter strap angles laterally and attaches to the cor respondi
116. rly inserted into the charger See the text for definitions of the status indicator lights POSEIDON MKVI USER MANUAL The Learn Cycle Activation Button Just above the Learn Cycle indicator light is a button Pressing the button will manually initiate a Learn Cycle It may be pushed at any time during a regular charge cycle to initiate a Learn Cycle The System will require a Learn Cycle if the smart battery is fully depleted if it has been more than 90 days since the last Learn Cycle or if the cell has had more than 20 charge cycles since the last Learn Cycle The system will recommend a Learn Cycle if it has been more than 45 days since the last Learn Cycle or if the cell has had 10 or more charge cycles since the last Learn Cycle Charge Cycle Indicator Light The right most light on the charger is the charge cycle indicator and it has the following meanings when plugged in with the smart battery inserted e Off The battery is being discharged as part of a Learn Cycle e Alternating Red and Green flashing once per second No battery detected e Both Red and Green flashing Battery is being charged more green as battery is charged e Red continuously on Charging has failed may require a Learn Cycle e Green continuously on Charge cycle completed successfully battery is fully charged While charging the light will flash rapidly when the battery is discharged and will flash more slowly as the battery becomes more charged As a gener
117. rminate the dive and commence a safe ascent to the surface in open circuit mode Figure 3 7 Alarm signal area DO NOT DIVE alert In the upper right corner of the Alarm Signal Area is a circle with a diagonal slash through it This symbol is the DO NOT DIVE Alert and it indicates that the system is not currently ready to be used for diving This symbol will always be activated when the Poseidon MkVI electronics are first turned on while the pre dive routine is being conducted As mentioned previously the upper right corner of the screen is the alarm signal area and under normal circumstances it should be completely blank It was designed this way so that a quick glance at the screen would be all that is neces sary to know whether any alarm conditions are active A blank field in the upper right corner of the screen means all systems are functioning properly and all parameters are working cor rectly In most cases the signals will flash when activated further drawing attention Figure 3 6 Abort and open circuit alerts Figure 3 8 DO NOT DIVE alert POSEIDON MKVI General alert The triangle symbol with an exclamation point located in the bottom right corner of the Alarm Signal Area will flash in synchrony with any other parameter s on the screen that is are inappro priate or out of acceptable range This signal is intended to catch the diver s attention and prompt the diver to scan the other elements on the
118. rned on and have sufficient gas to conduct a dive Following proper procedure both cylinders will have been in the off position when Test 44 is reached if not gas will be wasted during Tests 24 27 which verify that the four solenoid valves draw the correct amount of power when held open Each of these two tests will allow up to two minutes to turn on each cylinder The bottom one two or three segments of the respective cylinder pressure bar graphs will flash until sufficient pressure is detected Figure 2 8 When the system detects sufficient oxygen pressure it then waits until it detects sufficient diluent pressure Provided the oxygen cylinder pressure is greater than 34 bar 493 psi and the diluent pressure is greater than 51 bar 739 psi the automated pre dive check will pass the pre dive test routine will continue There is no upper limit for cylinder pressures for these two tests However it should be noted that the high oressure sensors themselves have an upper limit to the pressure they can correctly read The high pressure sensor for the oxygen cylinder is limited to 207 bar 3097 psi and the sensor for the diluent is limited to 300 bar 4410 psi Exposing either sensor to a pressure in excess of these limits may yield unpredictable results Also oxygen pressures in excess of about 135 bar 2000 psi pose a substantially increased risk of fire POSEIDON MKVI USER MANUAL Figure 2 8 Tests 44 and 45 confirming sufficient g
119. s especially tests 16 31 to fail It s also important to make sure the battery is not over charged In rare circumstances the battery might actually be charged beyond its intended capacity and this can also cause certain tests to fail If there is reason to suspect that the battery may be over charged insert the battery and or power up the electronics and maintain contact across the two wet switch terminals on the back of the Primary Display forcing the power to remain on in the event of a test failure After several minutes with the power on the battery should no longer be over charged and the automatic pre dive routine can be re started If the battery is properly charged and not over charged there are still several actions that may correct a persistent failure of one of the PSTs namely e Reboot Simply allowing the electronics to power down after a test failure then activating the wet switch again to re start the automatic pre dive test routine can often correct a failure in one of the tests e Reset Battery After repeated failures of the same test allow the system to power down following a failed test then remove the battery from the electronics and insert it into the battery charger with the charger plugged into an appropriate power supply After leaving the battery on the charger for a few minutes re insert the battery into the electronics which will re start the automatic pre dive test routine Sometimes this will solv
120. s control valves A very brief summary of these PSTs is as follows e Test 1 Confirms the main data logger is functional e Tests 2 9 verify the ROM RAM and EEPROM function in all four processors e Test 14 Confirms the battery data logger is functional e Test 15 Confirms the firmware version is consistent across all four processors e Test 16 Confirms the power consumption calculations are functioning properly e Tests 17 20 Confirm the power draw of the backlight solenoid valves and alarms are correct e Test 22 Vibrator current test e Tests 24 27 Solenoid current test e Test 29 Speaker current test e Tests 30 31 Cylinder HP sensor validation e Tests 34 35 PO sensor validation HW test e Test 38 Depth temperature sensor validation e Test 40 Decompression status verification e Test 43 Mouthpiece OC test e Tests 44 45 Sufficient oxygen and diluent to go diving test e Test 48 Sufficient battery power to go diving test e Test 49 Positive pressure loop test PPLT e Test 50 Mouthpiece CC test e Test 53 O2 calibration test e Test 54 Open Circuit regulator test e Test 55 Service interval test Test numbers 1 16 are conducted with the backlight off allowing more precise measurement of the power consumption of individual components such as the various alarms and solenoid valves Test 17 checks the power consumption of the backlight Figure 2 5 and the backlight remains on for the remainder of the pre dive tests
121. s is because the absorbent duration is keyed to the amount of oxygen contained in the oxygen supply cylinder As long as the absorbent cartridge is replaced whenever the oxygen cylinder is refilled the absorbent will always out last the oxygen supply DANGER The CO absorbent cartridge MUST be replaced whenever the oxygen supply cylinder is replaced or re filled Failure to change the absorbent cartridge in this fashion could lead to serious injury or death Removing the electronics module Unless a subsequent dive is planned soon after the previous dive its generally good practice to remove the Electronics Module from the breathing loop to allow inspection of the oxygen sensors and also to allow moisture from condensation to dry out Avoid removing the battery unless the e module is dry If the electronics are to be removed completely both gas supply cylinders must first be de pressurized so that the regulators can be removed Follow the instructions included in Chapter 3 for proper power down procedures which include depres surizing both gas supply cylinders POSEIDON MKVI USER MANUAL Replacing the water trap sponge If a surface interval between dives is planned to extend for an hour or more it is a good idea to remove the sponge from the Poseidon MkVI backpack and squeeze as much water out of it as possible It is best to replace the sponge and cartridge which must be removed to access the sponge immediately afterwards even
122. s of confidence based on various M factors include C1 C2 and C3 The last of Dil CH these C3 is normal and means the system has high confidence in the sensors The other levels CO C1 amp C2 generate errors and will trigger appropriate alarms E Ge GH 0 e SR Bo FS ca Yt Toke Out Ge Sal Figure 3 16 Oxygen sensor confidence alerts CO C1 C2 Mouthpiece position The area where the PO is normally displayed serves one additional function to communicate the current position of the Mouthpiece As with the PO Setpoint and Oxygen Sensor Confi dence warnings this information is displayed briefly every few seconds There are four possible values which are e cc in the upper half of the PO display area mouthpiece is in the Closed Circuit position e oc with o in the upper half CHAPTER 3 PAGE 53 e c in the lower half mouthpiece is in the Open Circuit position e nc with n in the lower half and c in the upper half mouthpiece is not fully in either position or un with u in the upper half and n in the lower half mouthpiece position is unknown The difference between nc no circuit and un unknown depends on whether the mouthpiece is reporting that neither closed circuit nor open circuit is currently established no circuit or whether the mouthpiece is not reportin
123. sembly together The mouthpiece should be in the closed circuit position to allow the check valves to dry on all sides CHAPTER 4 PAGE 63 Remove the battery from the electronics Module and recharge if necessary Be careful not to mix up different batteries with different electronics modules as they are keyed to each other Long term storage and care Storage If the rebreather is not going to be used for extended periods e g in excess of several weeks or months it s important to break down and store the rebreather properly The first step is to follow the instructions above for procedures to follow at the end of each diving day Once opened CO absorbent cartridges cannot be stored safely for extended periods of time so any opened cartridges should be discarded It is also important to ensure that all components are clean and dry before long term storage to avoid problems of corrosion as well as mold and other biological cultures The cylinders should be removed from the backpack unit and stored in a clean dry location This will prevent corrosion on the cylinders that may form from residual moisture or salt in the webbing material of the cylinder straps and will also prevent permanent deformation of the straps and the rubber cylinder mounts located on the sides of the backpack unit Cylinders should be stored with valves installed and at least some pressure inside the cylinder Be sure to maintain proper inspections and certi
124. sing problems The serial number of the rebrether unit is displayed in the lower left corner of the screen The serial number is represented in hexadecimal each digit can be either a numeral 0 9 or one of six letters A F Letters are represented as Wet switch contacts Figure 2 1 Connect the wet switch on the back of the Primary Display for Power Up CHAPTER 2 PAGE 39 ee a GE Se Figure 2 3 When the top and bottom segments on the display starts to blink re connect the wet switches Figure 2 2 nitial displays during the first two seconds of Power up showing firmware version and serial number The system waits for the diver to perform a power up confirmation procedure before proceeding There are two steps to this procedure First the diver must ensure that the wet switch contacts on the back of the Primary Display are not connected to each other In most cases this is accomplished by simply releasing the fingers from the wet switch contacts In very wet conditions it may be necessary to blow off excess water from the back of the Primary Display If they are connected the right side of the display will flash an alternating checker board pattern every other segment of the oxygen pressure bar graph indicating that the contacts need to be dried After the wet switch contacts have been dry for five consecutive seconds the top and bottom segments on the right side of the screen begin to flash Figur
125. system then injects diluent air via the diluent calibration solenoid valve In doing so this test calibrates the primary sensor and confirms that the correct gas mixtures are used in the respective cylinders This means that the milli volt reading from a sensor alone can t be used to establish if an oxygen sensor is working properly or not The response time of an oxygen sensor differs based on the temperature of the oxygen sensor This means that the temperature of an oxygen sensor can have a big effect on the success of a Pre Dive calibration If your unit stops at test 53 try the following to resolve the problem Verify that the gas cylinders are connected to the correct pneumatics block LP connections DIL O2 Make sure the cylinders contain the correct gas mix If winter diving warm the sensors up in your pocket If the unit keeps failing test 58 you might have to replace one or both oxygen sensors Once the service date is due the diver is prompted to acknowledge similar to power up pro cedure that he she has understood that service is needed A grace period of 4 weeks is added Depth reading difference When you compare the depth reading on the Poseidon MkVI display and your wrist mounted dive computer placing them side by side you might see a difference in depth This is due to the fact that the depth sensor in the MkVI is located at the bottom of the e module located behind your neck and not in the displa
126. t for an 11 adapter the Poseidon MkVI can be bolted to the CHAPTER 1 PAGE 13 e 11 inch Adapter See separate assembly manual Figure 1 13 Align the pin bolts of the 11 inch adapter with the upper hole and the most suitable hole of the plastic metal optional back plate of the Besea harness Fasten it using the wing nuts POSEIDON MKVI USER MANUAL 3 Counter lungs to BCD Harness Attach the counter lungs to the shoulder straps of your BCD Harness using the velcro straps on the back side of each counter lugn Upper counter lung buckle to tank band connection Connect the small male plastic clip on the upper part of the counter lung to the female plastic clip attached to the tank strap on the same side as the counter lung Adjust the position of the counter lung using the strap on each male plastic clip Shoulder strap Right counterlung port Velcro counterlung connection straps Three on each side Over pressure checkvalve port Figure 1 15 Lay out both left and right hand counterlungs and their water diversion manifolds Shoulder strap Left counterlung port CHAPTER 1 PAGE 15 The counterlungs on the Poseidon MkVI are designed to attach to the backpack straps and to be moveable along the straps An upper adjustable length quick connect buckle anchors the top end of the counterlungs to the gas processor Figure 1 16 Three velcro straps on the back of each counterlung Figure
127. ter representative or other qualified personnel Always use oxygen l compatible lubricants when servicing o rings and seals Open a j oxygen cylinder valves slowly Keep the oxygen regulator and g cylinder valve protected from the environment when removing and storing Never over fill the oxygen cylinder as higher pressures enhance the risk of fire Failure to follow these precautions could result in fire explosion serious injury and death Figure 1 35 Align the oxygen clean Figure 1 36 Align the diluent Connect the oxygen clean white marking High Pressure sensor located on the E Module to a HP port on the oxygen clean 1st stage See Figure 1 35 Connect the second High Pressure sensor located on the E Module to a HP port on the diluent 1st stage See Figure 1 36 WARNING Never attempt to adjust the interstage pressure or otherwise tamper with either of the first stage regulators Excessive pressure can cause the system to fail POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 25 9 LP hose amp HUD to mouthpiece g DH IJ Figure 1 38 Twine the HUD cable around the braided 90 cm hose L Kaz Connect the long braided 90 cm Low Pressure hose to a IP port on the diluent 1st stage See Figure 1 37 Make sure the connection o ring is in place and without damages Connect the long braided 90 cm Low Pressure hose to the 9 16 connection on the mouth piece See Figure 1 39 Twine the HUD cable located on the E
128. ters OC flash in the upper left corner of the screen along with the Open Circuit Bailout icon indicating the need change the mouthpiece back to OC mode When the mouthpiece is switched the word bREAtHE scrolls across the two PO value digits in the upper right corner of the screen This prompts the diver to test the function of the open circuit regulator After inhaling several breaths from the regulator the test passes POSEIDON MKVI USER MANUAL Service interval check test 55 The final test Test 55 Figure 2 12 is also the simplest This test merely ensures that the rebreather unit does not require servicing Each rebreather unit must be brought to a qualified Poseidon Service Center at least once every two years to receive updates and make any necessary repairs or adjustments When Test 55 is displayed the number in the lower right corner of the screen adjacent to the small clock icon indicates the number of weeks remaining before servicing will be required When this value gets low return the rebreather to an authorized Poseidon service center for maintenance Upon passing Test 55 the pre dive routine is complete Once the service date is due the diver is prompted to acknowledge similar to power up procedure that he she has understood that service is needed A grace period of 4 weeks is added Figure 2 12 Test 55 Service interval check Cleared to dive Under normal circumstances the Poseidon MkV
129. tes then change the mouthpiece position If you hear the audio alarm then change the mouthpiece position NOW If the Heads Up Display light on the mouthpiece is STEADY ON then ASCEND at a safe and controlled rate to the surface If the Heads Up Display light on the mouthpiece FLASHES then STOP look at the LCD screen In general this is a reminder to you to keep track of your PO which is shown in the upper left field of the display However other data are included on the display including directional arrows that advise you to go up ascend or go down descend The latter would be active and flashing for example if you have accumulated decompression debt and have ascended through a decompression stop More information on the functionality of the display is presented in Chapter 3 CHAPTER 3 PAGE 61 When in doubt bail out switch to open circuit OC and ascend in a controlled manner to the surface The default setpoint control algorithm is designed to allow for hands off control of the system PO during all phases of a dive The Poseidon MkVI uses a proprietary method that begins with a default control setpoint on the surface of 0 5 bar and gradually increases PO to a maximum automatic value of 1 2 bar at a depth of 15 m 50 ft Beyond this depth the system will automatically control to a setpoint of 1 2 bar to the maximum operating depth of the rig at 40 m POSEIDON MKVI USER MANUAL CHAPTER 4 PAGE 62 Chapter 4 Post
130. the secondary sensor The use of oxygen to perform Test 49 PPLT helps this test complete properly because the breathing loop will have already been pre charged with oxygen After the calibration constants for oxygen are established the system then injects diluent air via the diluent calibration solenoid CHAPTER 2 PAGE 45 valve In doing so this test both calibrates the sensors and confirms that the correct gas mixtures are in the respective cylinders This test is by far the most important of all the pre dive tests as it is determining whether the oxygen sensors are providing true values for the partial pressure of oxygen PO Failure of this test can occur for a number of reasons all of which the user should be familiar with Most causes relate directly to the oxygen sensors themselves either bad or aged sensors failing the test or the presence of condensate on the sensors from a prior dive If Test 53 fails persis tently verify that the gas cylinders are connected to the correct regulators and make sure they contain the correct gas mixtures If the test continues to fail one or both of the oxygen sensors may need replacing When changing oxygen sensors it s very useful to keep track of which oxygen sensor was placed in which position by noting the individual oxygen sensor serial numbers Figure 2 11 Test 53 Oxygen Sensor calibration Open circuit regulator function test 54 After completing test 53 the let
131. the nut locks against the lower thread flange on the manifold Do NOT over tighten or use any tools as this may result in stripping the threads and ruining both the connector and the manifold port Repeat these steps with the right rear breathing hose so the rig is as shown in Figure 1 21 POSEIDON MKVI USER MANUAL breathing hose The next step is to attach the rear right breathing hose to the back see Figure 1 25 of the water diversion manifold Insert the hose as shown in Figures 1 25 Follow the same procedure for O ring and sealing surface inspection and lubrication as previously described for all hose connections Tighten out do NOT over tighten the right rear hose nut onto the right rear manifold thread Repeat these steps for the left water diversion manifold and counterlung Figure 1 26 3 Figure 1 25 Attach the right counterlung aie water diversion manifold to the right rear Radial o ring seal Sealing surface for radial o ring seal Retainer nut capture thread CHAPTER 1 PAGE 19 Figure 1 26 Attach the left rear breathing hose to the left counterlung shoulder port SS POSEIDON MKVI USER MANUAL 6 Attaching the cylinders Attach the two tanks to the canister housing tank connections and secure them with the tank straps If you imagin wearing the unit on your back the oxygen white valve knob tank should be mounted on your right hand side and the diluent black valve knob
132. the oxygen cylinder is 185 bar 2000 psi The reason is twofold first the risk of oxygen fire increases sharply at higher pressures and second using a greater supply of oxygen increases the risk that the CO absorbent cartridge may not be sufficient to last for the entire dive on a single fill Diluent cylinder Oxygen cylinder Figure 1 12 How the rig should appear when properly assembled CHAPTER 1 PAGE 10 It is also extremely important to NOT replace either of regulators that are provided with the Poseidon MkVI The oxygen cylinder valve and regulator have been cleaned for oxygen service at the rated cylinder pressure using regulators or valves not so cleaned dramatically increases the risk of oxygen fire and or explosion More importantly the provided regulators have been adjusted with a lower interstage pressure for use with the oxygen and diluent solenoid valves Using different regulators with higher interstage pressures will cause the solenoid valves to fail and may lead to permanent damage POSEIDON MKVI USER MANUAL CHAPTER 1 PAGE 11 Filling the cylinders From a diving logistics perspective the Poseidon MkVI differs from normal Scuba in that it uses two separate gas supplies a pure oxygen supply and a diluent Supply Pure oxygen is necessary for the control system to exactly replace the oxygen consumed by metabolism The DANGER definition of a diluent gas in a rebreather is any gas that serves to di
133. the water with perfect buoyancy while breathing continuously The quickest and easiest way to fine tune buoyancy with a rebreather is via addition and removal of gas to or from the breathing loop To increase buoyancy slightly a small amount of gas can be added to the breathing loop via the ADV either by manually engaging the purge CHAPTER 3 PAGE 59 button or by making an especially deep inhaled breath To decrease buoyancy slightly one need only exhale through the nose to vent gas out of the breathing loop except when certain kinds of full face masks are used New rebreather divers often have the most difficulty in very shallow water where a slight change in depth yields a proportionally large change in displacement and hence buoyancy This is especially true when the diver begins to ascend which causes the counterlungs to expand leading to increased buoyancy leading to further ascents and expanding loop volume This can lead to a run away ascent that can be difficult to control For this reason it s useful practice for rebreather divers to be in the habit of venting gas through the nose whenever ascending particularly from very shallow depths Venting water from the loop Even if a diver is very careful to prevent water from entering the breathing loop there will always be some water collecting due to condensation Most of this will form on the exhalation side of the breathing loop between the mouthpiece an
134. ther designs Among the breakthroughs are e Extreme compactness at only 18 kg 40 Ibs ready to dive and 9 kg 20 Ibs travel weight the MkVI is one of the world s smallest rebreathers Take it as carry on baggage when flying Enjoy the freedom Yet it is not lightweight in terms of performance you get three depth independent hours1 of near silent diving e The first truly auto calibrating and auto validating rebreather The MkVI uses a patented automated method to verify that the oxygen sensors are working properly at all times both before and during a dive e An intelligent battery it s your personal power and data storage system Plug it in and the system knows it s you as well as your dive history including repetitive dive information Remove the modular battery put it in your shirt pocket and take it home to recharge it When you are ready to dive take the battery from the Charger and plug it into the rebreather e True plug and play carbon dioxide absorbent cartridges Simple and fast to use Pre packed axial cartridges of SofnoDive 797 absorbent give you 3 hours minimum diving range1 and can be changed out and replaced in seconds e The world s most advanced rebreather interface The MkVI contains five separate warning and advisory systems so that you get the information you need to manage your dive without the task loading normally associated with rebreathers The main Poseidon MkVI data i
135. tion following the previous steps If for some reason the mouthpiece is not in the OC position when Test 43 appears on the screen the mouthpiece vibrator will activate along with the HUD and battery LEDs and audio alarm The letters OC will appear in the upper left corner of the LCD screen and along with the Open Circuit icon diver with bubbles will flash until the mouthpiece switch is placed in the OC position Figure 2 7 The system allows the diver up to two minutes to make this switch The Open Circuit icon will continue to display on the LCD until Test 50 when the mouthpiece needs to be switched to the closed circuit CC position If the mouthpiece appears to be in the open circuit position but Test 43 does not pass then make sure that the mouthpiece switch is fully in the OC position If the test still will not pass then make sure the HUD is positioned correctly on the mouthpiece and is not twisted or otherwise moved from its proper position If no amount of repositioning of the mouthpiece lever or HUD allows the system to pass Test 43 then contact an authorized Poseidon Service Center Figure 2 7 Test 43 Mouthpiece in OC position displaying Open Circuit icon to indicate that the mouthpiece must be placed in the Open Circuit position CHAPTER 2 PAGE 42 Oxygen and diluent cylinder supplies test 44 amp 45 Tests 44 and 45 determine whether the Oxygen and Diluent cylinders respectively are tu
136. to sensor base Ce Figure 4 3 Press button to lock tool onto sensor base Hold the button and pull the oxygen sensor base out of the electronics module Figure 4 4 Pull the sensor out while pressing button POSEIDON MKVI USER MANUAL With the Oxygen Sensor removal tool snapped into the oxygen sensor base press the plunger button with the thumb Figure 4 3 to lock it in While continuing to press the button pull the tool away from the electronics module and the oxygen sensor base with oxygen sensor attached will slide out easily Figure 4 4 Whenever an oxygen sensor is changed the serial number of the new sensor and its position Primary or Secondary should be logged This should also be done whenever the positions of the two oxygen sensors are reversed Doing so allows the history of the sensor to be tracked over time and correlated with the logged data associated with that sensor Such information can be extremely valuable for detecting when a sensor is nearing the end of its life The serial number of the sensor is printed on the sensor label as shown in Figure 4 5 Once the oxygen sensor base and sensor are removed from the electronics module the elec trical connection can be unplugged from the back of the sensor Detach the tool from the sensor base by releasing the plunger button and pulling it off The oxygen sensor can then be removed from the sensor base by unscrewing it Figure 4 5 Attach the new oxyge
137. too high 11 Current too low 12 Current too high 11 Current too low 12 Current too high APPENDIX PAGE 73 SOLUTION 1 Standard Response 2 If test failure persists or if no faint click sound from the main electronics module can be heard at the start of this test contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists or the Battery LED does not turn on during this test contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists or the HUD does not vibrate during this test contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists or the HUD LED does not turn on during this test contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists or if no faint click sound from the main electronics module can be heard at the start of this test contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists or if no faint click sound from the main electronics module can be heard at the start of this test contact an authorized Poseidon Service Center for repair 1 Standard Response 2 If test failure persists or if no faint click sound from the main electronics module can be heard at the start of this test contact an authorized Poseidon Service Center for repa
138. ttery computer keeps track of how long it has been since the last time it has undergone a full Learn Cycle If that time exceeds a certain value the computer will advise the user to perform an optional Learn Cycle If the time since the last Learn Cycle is very long the computer may automatically initiate a Learn Cycle The Learn Cycle takes approximately 8 hours to complete Once a Learn Cycle has been initiated it can only be stopped either by successful completion of the Learn Cycle or by physically removing the battery from the charger not recommended The Learn Cycle indicator light has the following meanings when plugged in with the smart battery inserted e Off Learn Cycle not needed or not in progress e Alternating Red and Green flashing once per second Learn Cycle is recommended e Both Red and Green simultaneously flashing once per second Learn Cycle is in progress e Red continuously on Learn Cycle has failed often caused by power loss or user intervention e Green continuously on Learn Cycle successfully completed CHAPTER 1 PAGE 6 a SS sir ie 3 p Learn cycle activation button Power status on off Learn cycle status Charge status Figure 1 9 Left nserting the smart battery into the desktop charging station The battery screw posts align with the vertical slots the battery is pushed down until the contact post mates with the offset cylindrical receiver hole Right The battery prope
139. ular plug and play carbon dioxide filter system It is equipped to handle Molecular Products SofnoDive 797 axial flow pre packed cartridges Procedures for changing out the cartridge are presented in detail below in the Cartridge Housing discussion Gas injection module In a fully closed rebreather like the Poseidon MkVI oxygen is consumed by the diver and a mechanism must be provided for replacement of that used oxygen Otherwise the mixture will slowly be depleted to dangerously oxygen low levels hypoxia The MkVI is designed to maintain the partial pressure of oxygen PO well above hypoxic levels and to also prevent it from becoming too high hyperoxia This is achieved by a control system that uses sensors that are responsive to the partial pressure of oxygen and a mechanism for the addition of pure oxygen to the system when the sensors indicate that the oxygen level is below the target value known as the PO setpoint The gas injection module in the Poseidon MkVI does this and much more In a patented design this module provides the mechanisms for not only adding pure oxygen to make up for metabolized gas but also to automatically cali brate the oxygen sensors prior to diving as well as validate the sensors during the course of each dive Electronics module The electronics module provides a single plug and play component that includes the previ ously described gas injection module and the smart battery It also includes th
140. ure for 20 seconds If any of the four solenoid valves are leaking the pressure inside the breathing loop will gradually rise Assuming no increase in loop pressure is detected during this 20 second period the second metabolic solenoid valve is used to inflate the breathing loop to a higher internal pressure When this happens the counterlungs will be tightly inflated and the internal pressure should be slightly less than the cracking pressure of the over pressure relief valve on the bottom of the right counterlung when that valve is adjusted to its maximum cracking pressure The system then monitors the loop pressure for the next 20 seconds to determine whether the pressure decreases as by a leak in the breathing loop IMPORTANT While Test 49 is being conducted be careful not to manipulate the counterlungs too much or do anything that might affect the internal loop pressue independently of the gas injected by the metabolic solenoid valves The test can be performed while wearing the rebreather as long as there is not too much motion or instability of the counterlungs It s recommended that you don t let the mouthpiece and loop rest against the counter lungs during test 49 as this might cause the test to fail Closed circuit mouthpiece position test 50 The mouthpiece should have been left in OC position following Test 43 as indicated by the Open Circuit icon on the Primary Display At Test 50 Figure 2 10 the icon disappe
141. ut also validate that the oxygen sensor readings are correct and accurate Although there are many alarm systems built into this system it is always good practice for divers to regularly monitor the PO value on the Primary Display screen to ensure that it is within limits and that the value itself is not flashing Monitoring gas supplies The next most important parameters to monitor are the gas supplies represented as bar graphs on the left and right sides of the Primary Display In particular it is important to make sure that the Air Dil pressure graph is not flashing The electronics system will constantly calculate whether there is enough air supply remaining to allow a safe open circuit bailout to the surface If there is not enough air to allow a safe open circuit bailout to the surface the Up Arrow will be displayed on the LCD Display indicating that the diver should ascend to a shal lower depth The oxygen supply pressure should also be monitored to ensure there is a sufficient quantity of oxygen remaining in the oxygen cylinder to complete the remainder of the dive in closed circuit mode Because these values change very slowly throughout the course of a typical rebreather dive there is a tendency to ignore them As with other important parameters there will be warnings issued in case the oxygen supply pressure gets too low but nevertheless the diver should be in the habit of monitoring this value regularly CHA
142. ver via the Primary Display It consists of a backlit liquid crystal display LCD with pre printed numerals and symbols and provides the diver with important information concerning sensor readings system messages decompression status and other data during the course of the dive It is extremely important that all Poseidon MkVI divers understand how to read the information contained in the Primary Display particularly concerning various alarm conditions Before even turning the Poseidon MkVI electronics on it is useful to understand the general layout of the Primary Display and the logic behind how the information is organized The display is arranged in six regions each presenting different kinds of information The most important region is the upper right corner of the screen 1 in the illustration which contains icons for alarm conditions Under normal circumstances this region should be blank The alarm condition icons described in more detail below are designed to symbolically represent the nature of the problem and most of them will flash when activated This should be the first part of the screen that a diver should glance at when monitoring the Primary Display as it will be immediately obvious if there are any alarm conditions and what they are CHAPTER 3 PAGE 49 POSEIDON MKVI USER MANUAL Stop ascending Ascent indicator Ceiling alert ABORT alert DO NOT DIVE Oxygen partial pressure Oxygen gas pressure El
143. w in detail are the pre packed Sofno dive 797 manufactured by Molecular Products and available through Poseidon authorized dive centers and dealers With the cartridge removed inspect the cartridge housing end plate Figure 1 53 for scratches and gouges to any of the o rings or o ring sealing surfaces Replace o rings if required and re lubricate Lift uo and remove Figure 1 53 the bottom annular sponge water trap This sponge should be relatively dry when diving in relatively warm water but may be damp or soaked when diving in cold water Improper use of the rebreather may also allow water to enter the breathing loop and possibly reach the cartridge housing While the water diversion mani folds will trap most of the water acrobatic swimming rolls flipping from head down to head up orientation etc can defeat the system if the user is not paying attention causing water to reach the sponge It is good practice to rinse disinfect and dry the lower absorbent sponge following a dive Any disinfectant solution that doesn t have a negative effect on plastics and or rubber can be used for this purpose Poseidon recommends using a disinfectant called Gigasept or a disinfec tant called Virkon CHAPTER 1 PAGE 32 At this point it is time to load a fresh SofnoDive 797 CO absorbent cartridge Cartridges are available two to a pack Figure 1 54 and are sealed in an air tight envelope for long term storage As previously described ea
144. with the smooth cylindrical outer face Be sure when you insert the end cap into the cartridge that the radial o ring does not extrude from its circular groove The top radial o ring in the end cap should insert smoothly into the CO cartridge until it is no longer visible and the bottom of the cartridge is flush with the ledge just above the two main radial o rings Inspect the cartridge top plate Figure 1 57 and its radial and axial o ring seals If any of the O rings are damaged cut or gouged replace them Ensure that each o ring is lubricated and CHAPTER 1 PAGE 33 Radial o ring seal to top of SofnoDive 797 cartridge Figure 1 58 Insert cartridge top plate and inspect the face seal o ring Figure 1 59 Inspect and lubricate cartridge housing end cap radial sealing surface that there is no debris dust sand etc on any of the o rings Insert the cartridge top plate into the top of the SofnoDive 797 cartridge The top end is the one with the projecting ribs along the circumference of the end of the cylinder Be sure when you insert the cartridge top plate into the cartridge that the radial o ring does not extrude from its circular groove The radial o ring in the cartridge top plate should insert smoothly into the CO cartridge until it is no longer visible and the top rim of the cartridge is flush with the ledge just above the radial o ring Unlike the radial o ring that seats in the bottom end of the cartridge the to
145. y it self C1 alarms on land When your Poseidon MkVI has passed the Pre Dive check you should always set the mouth piece DV switch to its Open Circuit OC position If you set it in Closed Circuit CC position you will most likely get a C1 alert This is normal POSEIDON MKVI USER MANUAL The reason for this alert is that when the unit is turned on and the mouthpiece is in CC mode it will perform sensor validations checking the PO value even when it is on land If the differ ence in PO value is too small when the unit compares the PO value from the last validation with the PO reading from the most recent validation the unit assumes that the primary oxygen sensor is frozen and giving a false reading If you get a C1 alert when your unit is on land do the following to turn the alert of 1 Set the DV switch to CC mode 2 Breath on the loop to change the PO value 3 Continue breathing on the loop until the next successfull sensor validation is performed about 2 min maximum 4 When the C1 alert goes away set the DV switch in OC mode If the C1 alert persists after you ve done the 4 steps above then there s something else causing the C1 alert Note The C1 alert will NOT go away by switching the mouthpiece DV switch to OC mode only Hyperoxic linearity test When you descend and reach 6 m 20 swf depth the Discovey will do a Hyperoxic Linearity test The reason for the test is to make sure that th
146. ystem monitoring Merely understanding how to read and interpret the information presented on the Poseidon MkVI Primary Display is only the first step All divers must learn to monitor the Primary Display and alarm systems regularly throughout the dive In addition to the parameters monitored during an open circuit scuba dive e g depth cylinder pressure decompression status a closed circuit rebreather diver must also monitor other variables such as the PO of the breathing gas and the remaining battery life The MkVI is designed to make the task of monitoring these parameters as easy and straightforward as possible and alarm systems have been incorporated to alert the diver when these parameters drift out of safe range Nevertheless it is vitally important to the safety of the diver that good system monitoring habits be developed Monitoring the PO value The most critical parameter to monitor on any closed circuit reobreather is the oxygen partial pressure in the breathing loop The most dangerous aspect of closed circuit rebreathers is the fact that the oxygen concentration in the breathing gas is dynamic and can change Consider ing the lack of reliable physiological warning symptoms for impending hypoxia or CNS oxygen toxicity and the severity of these maladies while underwater the importance of frequent PO monitoring should be obvious Fortunately the Poseidon MkVI is designed to not only monitor the PO value in the breathing loop b

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