Poseidon MKVI User Manual POSEIDON MKVI USER MANUAL Chapter 1 Page 1
Poseidon MKVI User Manual Chapter 1 Page i Table of Contents Table of Contents.................................................................................................... i Conventions Used in this Guide............................................................................. iv Preface.................................................................................................................. v Conformance With CE Requirements............................................................
Poseidon MKVI User Manual Negative-Pressure Loop Test.........................................................................38 Electronics Power-Up....................................................................................39 Power-up self test (test 1 - 38)......................................................................40 Pre-Dive Tests (test 39 - 55)..........................................................................41 Closed Circuit mouthpiece position (test 39)....................
Poseidon MKVI User Manual Replacing the oxygen and CO2 absorbent cartridge.......................................63 Removing the electronics module.................................................................63 Replacing the water trap sponges.................................................................64 After each day of diving........................................................................................64 Open the breathing loop........................................................
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 substitute for proper training through a legitimate training agency approved by Poseidon AB. It is only intended to provide basic information concerning the Poseidon MKVI.
Poseidon MKVI User Manual Chapter 1 Page v Preface Congratulations on your decision to purchase the Poseidon MKVI Closed-Circuit Rebreather (CCR). The Poseidon MKVI design includes several fundamental improvements over previous closed-circuit rebreather designs. Among the breakthroughs are: • Extreme compactness – at only 18 kg / 40 lbs ”ready to dive” and 9 kg / 20 lbs “travel weight” the MKVI is one of the world’s smallest rebreathers. Take it as carry-on baggage when flying. Enjoy the freedom.
Poseidon MKVI User Manual Chapter 1 Page vi Conformance with CE requirements The information listed in this chapter are the CE requirements that have 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.
Poseidon MKVI User Manual 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.
Poseidon MKVI User Manual Chapter 1 Page 1 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.
Poseidon MKVI User Manual Chapter 1 Page 2 Open circuit/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, depthindependent diving.
Poseidon MKVI User Manual Chapter 1 Page 3 Breathing loop overview Electronics module Diluent regulator Diluent cylinder valve Diluent high pressure sensor Left rear breathing hose connection Oxygen regulator Oxygen cylinder valve Oxygen high pressure sensor Right rear breathing hose connection Diluent cylinder Oxygen cylinder 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
Poseidon MKVI User Manual Chapter 1 Page 4 Carbon dioxide absorbent cartridge At the heart of all rebreathers is the requirement to remove the metabolically-generated carbon dioxide (CO2) from the breathing loop and replace the oxygen consumed through metabolism. The Poseidon MKVI is designed around a modular plug-and-play carbon dioxide filter system. It is equipped to handle Molecular Products SofnoDive® 797 axial flow prepacked cartridges.
Poseidon MKVI User Manual Figure 1-6. Smart battery module Smart battery care 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.
Poseidon MKVI User Manual Chapter 1 Page 6 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 counterclockwise order from the lower left in Figure 1-9: power, “Learn Cycle” status, and charge status.
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.
Poseidon MKVI User Manual IMPORTANT: If a user removes the battery from the rig they were diving and then uses that battery in a different Poseidon MKVI unit for subsequent dives, the decompression data in the rebreather system will differ from those contained in the battery.
Poseidon MKVI User Manual Chapter 1 Page 9 in the CO2 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.
Poseidon MKVI User Manual Chapter 1 Page 10 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 the oxygen cylinder is 135 bar / 2000 psi.
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 definition of a diluent gas in a rebreather is any gas that serves to dilute the oxygen when mixed in the breathing loop.
Poseidon MKVI User Manual Part 2 – Assembly Before you start assembling your Poseidon MKVI eCCR, you should perform the following preparations: • Make sure you have a scrubber that will last your planned dive(s). • Fill your diluent tank with the correct gas. • Fill your oxygen tank with the correct gas. • Make sure your battery is fully charged and recently learn cycled. • Make sure you have all parts and that they are without damage. • Lubricate all o-rings that you can access.
Poseidon MKVI User Manual Chapter 1 Page 13 1. Stabjacket / BCD / Wing Attach the cansiter 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 MKVI User Manual Chapter 1 Page 14 2. Tank band Figure 1-14a. Tank band (assesory). 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 . Fold the tank band and thread it back through the same opening on the tank band bracket.
Poseidon MKVI User Manual Chapter 1 Page 15 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.
Poseidon MKVI User Manual Chapter 1 Page 16 4. Rear CC hoses to counter lung T-connections. Connect the T-connection to the top port in each counter lung. Radial seal surface Radial o-ring seal Thread connection post Figure 1-17. Insert the right hand water diversion manifold into the port on the right counterlung. Checkvalve port Locate the two counterlungs and their respective water diversion manifolds (also known as “shoulder ports” or “T ports”) and lay those out for assembly .
Poseidon MKVI User Manual Chapter 1 Page 17 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.
Poseidon MKVI User Manual Chapter 1 Page 18 5. Rear CC loop hoses Figure 1-22. Closeup of hose connection. 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.
Poseidon MKVI User Manual Chapter 1 Page 19 Figure 1-25. Attach the right counterlung water diversion manifold to the right rear breathing hose. ”Radial” o-ring seal Sealing surface for ”radial” o-ring seal Retainer nut capture thread 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.
Poseidon MKVI User Manual Chapter 1 Page 20 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) tanks should be mounted on your left hand side. Make sure that tanks are filled with the correct gases.
Poseidon MKVI User Manual Chapter 1 Page 21 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 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. At the heart of the Poseidon MKVI is an electronic, pneumatic, control, and user feedback system.
Poseidon MKVI User Manual Chapter 1 Page 22 Inspect the inner 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. Outer radial seal Inspect both inner and outer electronics module radial o-rings (Figure 1-30).
Poseidon MKVI User Manual Chapter 1 Page 23 8. 1st stages Connect the 16 cm Low Pressure hose to a IP port on the diluent 1st stage 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 1-33 illustrate the assembly of the diluent cylinder with the gas processor stack, analogous to that of attaching the oxygen cylinder. Always inspect cylinder and regulator threads and the regulator o-ring before assembly.
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 Center representative or other qualified personnel.
Poseidon MKVI User Manual Chapter 1 Page 25 9. LP hose & HUD to mouthpiece Figure 1-38. Twine the HUD cable around the braided 90 cm hose 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 mouthpiece. See Figure 1-39.
Poseidon MKVI User Manual Chapter 1 Page 26 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 of the Jetstream Octopus, please read the Jetstream Octopus manual. 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. Figure 1-40. The alternative air source (i.e.
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 lung T-connection. Connect the right front CC loop hose to the exhalation counter lung T-connection. Lay out the two remaining breathing hoses. Connect the right front breathing hose to the front port of the right counterlung water diversion manifold (Figures 1-43).
Poseidon MKVI User Manual Chapter 1 Page 28 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.
Poseidon MKVI User Manual 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.
Poseidon MKVI User Manual Chapter 1 Page 30 13. Scrubber The largest physical element of the rebreather is the CO2 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.
Poseidon MKVI User Manual Chapter 1 Page 31 WARNING: The CO2 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 1-48. Loosen the hand nuts attaching the bottom plate. Figure 1-51. Remove the cartridge top plate. Figure 1-49.
Poseidon MKVI User Manual DANGER: Dangerous levels of carbon dioxide (CO2) can cause symptoms that include, but are not limited to, rapid breathing, severe headache, tunnel vision and disorientation. High CO2 levels can also increase the potential for oxygen toxicity. Diving a closedcircuit rebreather with an expended CO2 absorbent cartridge could lead to serious injury or death.When in doubt, switch the mouthpiece to open-circuit mode and end the dive immediately.
Poseidon MKVI User Manual Chapter 1 Page 33 Radial o-ring seat to bottom of SofnoDive® 797 Cartridge 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. Radial o-ring seal to top of SofnoDive® 797 cartridge ”Top” end of cartridge has projecting ribs. Figure 1-57.
Poseidon MKVI User Manual IMPORTANT: In between dives vent the system by removing the e-module from the canister housing top. 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.
Poseidon MKVI User Manual 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 CO2 absorbent cartridge. If this is the case, return to Step 14 (above) and install the axial o-ring then resume. WARNING: Because CO2 exists naturally in the atmosphere, a SofnoDive 797 cartridge openly exposed to the atmosphere will expire in 24 hours.
Poseidon MKVI User Manual Chapter 1 Page 36 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.
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.
Poseidon MKVI User Manual WARNING: Always replace the CO2 Absorbent cartridge with a new, un-used absorbent cartridge whenever the oxygen cylinder is re-filled. This will minimize the risk of CO2 poisoning! Chapter 2 Page 38 With the mouthpiece in the OC position, observe over a period of a minute 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.
Poseidon MKVI User Manual Chapter 2 Page 39 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.
Poseidon MKVI User Manual If the system is powered-up by inserting the battery, the system continues directly to the “allsegments” screen (Figure 2-4), without the need to complete the power-up confirmation routine. The Poseidon MKVI electronics system conducts 55 automated and semi-automated tests during the pre-dive routine. This procedure verifies a wide variety of parameters, and takes about 3 minutes to complete.
Poseidon MKVI User Manual Chapter 2 Page 41 Pre-Dive Tests 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.
Poseidon MKVI User Manual Chapter 2 Page 42 Tissue tension (test 40) Open circuit mouthpiece position (test 43) As discussed in Chapter 1, the Poseidon 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.
Poseidon MKVI User Manual Chapter 2 Page 43 Oxygen and diluent cylinder supplies (test 44 & 45) Tests 44 and 45 determine whether the Oxygen and Diluent cylinders, respectively, are turned 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).
Poseidon MKVI User Manual Chapter 2 Page 44 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).
Poseidon MKVI User Manual 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.
Poseidon MKVI User Manual Chapter 2 Page 46 Open circuit regulator function (test 54) After completing test 53, the letters “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 PO2 value digits in the upper-right corner of the screen. This prompts the diver to test the function of the open-circuit regulator.
Poseidon MKVI User Manual Chapter 2 Page 47 Poseidon MKVI Pre-dive checklist Start up Procedure 1 Cylinders OFF, CLOSE OPV, OPEN-CIRCUIT mode. 2 Touch wet-switch, keep dry for 5 seconds, then HOLD wet-switch. 3 Test 44, 45: turn cylinders ON. Pre-dive checklist Check for damage, dirt and deteriorations during assembly. 1 Check that the battery is charged. 4 Test 50: CLOSED-CIRCUIT. 2 Inspect electronics module, handset, cables, electric connections, HUD, pneumatics hoses and oxygen sensors.
Poseidon MKVI User Manual Chapter 3 Page 48 Chapter 3 – Dive procedures HUD vibrator DANGER: Do NOT attempt to use the Poseidon MKVI rebreather without proper training! This Manual is NOT an adequate substitute for training from a qualified Poseidon MKVI instructor. Failure to obtain proper training prior to using the Poseidon MkVI 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.
Poseidon MKVI User Manual Chapter 3 Page 49 Audio alarm WARNING: In the event that there is insufficient diluent supply to effect a safe ascent to the surface in open-circuit mode while the HUD vibrator is activated, then continue the ascent to the surface in closedcircuit mode. 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.
Poseidon MKVI User Manual Chapter 3 Page 50 Stop ascending Ascent indicator ABORT alert Ceiling alert DO NOT DIVE Oxygen partial pressure Oxygen gas pressure Electronics alert Diluent gas pressure General alert Current depth Remaining dive time Maxumum depth Elapsed dive time Temperature OR High-res PO2 Ascend / descend indicator Figure 3-3. Fields on the primary display. Figure 3-2. LCD display layout.
Poseidon MKVI User Manual Chapter 3 Page 51 Units of measure Abort! and open circuit alerts The 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 ºF or ºC.
Poseidon MKVI User Manual Chapter 3 Page 52 General alert Stop 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 inappropriate 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 screen to see which value(s) is/are also flashing.
Poseidon MKVI User Manual PO2 setpoint Hyperoxic linearity test Every few seconds, the PO2 value will briefly (less than one second) switch to show the current PO2 Setpoint. Normally, this value will be the same as the current PO2, because the system will normally maintain the correct PO2 (i.e., Setpoint PO2). In some cases, however, the value may be slightly different. In any case, the PO2 Setpoint value can be distinguished from the current PO2 value by the size of the first digit (either “1” or “0”).
Poseidon MKVI User Manual Chapter 3 Page 54 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.
Poseidon MKVI User Manual Chapter 3 Page 55 Maximum depth / Ceiling IMPORTANT: When the mouthpiece is in the “cc” position, the PO2 control system maintains the loop PO2 at whatever the current PO2 setpoint is, and decompression calculations are based on the current PO2 value.
Poseidon MKVI User Manual Chapter 3 Page 56 Remaining dive time (RDT) Elapsed dive time 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). The OTU’s will be logged and can be monitored through the PC tool.
Poseidon MKVI User Manual Chapter 3 Page 57 Battery life indicator Cylinder pressure indicators 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 indicator will flash, and the screen will indicate that the dive should be terminated.
Poseidon MKVI User Manual System 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.
Poseidon MKVI User Manual Chapter 3 Page 59 Breathing underwater Counterlung placement Counterlung strap adjustments When properly 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.
Poseidon MKVI User Manual Chapter 3 Page 60 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.
Poseidon MKVI User Manual Chapter 3 Page 61 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 PO2 caused by the drop in ambient pressure.
Poseidon MKVI User Manual Chapter 3 Page 62 IMPORTANT: Do NOT remove the battery while the electronics system is active. Failure to complete a proper shut-down procedure will cause the battery CPU to remain active, and drain the power supply unnecessarily. Safe diving with the Poseidon MKVI • NEVER hold your breath when breathing underwater! • • ALWAYS change the CO2 absorbent cartridge whenever the oxygen cylinder is refilled or replaced.
Poseidon MKVI User Manual Chapter 4 Page 63 Chapter 4 - Post-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.
Poseidon MKVI User Manual Chapter 4 Page 64 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 if the sponge isn’t completely dry, to minimize the chance of replacing the wrong CO2 absorbent cartridge.
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.
Poseidon MKVI User Manual Chapter 4 Page 66 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.
Poseidon MKVI User Manual Chapter 4 Page 67 Traveling with the Poseidon MKVI 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).
Poseidon MKVI User Manual Appendix 1 Page 68 Appendix 1 - Troubleshooting guide This Appendix provides detailed information on possible problems that may occur when preparing or using the Poseidon MKVI for diving. It is divided into two main sections: The Automatic Pre-Dive Tests, and Hardware Issues.
Poseidon MKVI User Manual Appendix 1 Page 69 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 “0” 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.
Poseidon MKVI User Manual Appendix 1 Page 70 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. 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 system then injects diluent (air) via the diluent calibration solenoid valve.
Poseidon MKVI User Manual Appendix 1 Page 71 How the PO2 alarm works 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 PO2 value, even when it is on land. If the difference in PO2 value is too small, when the unit compares the PO2 value from the last validation with the PO2 reading from the most recent validation, the unit assumes that the primary oxygen sensor is ”frozen” and giving a false reading.
Poseidon MKVI User Manual Appendix 1 Page 72 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.
Poseidon MKVI User Manual T# Time (sec) Description Appendix 1 Page 73 Error Code Solution 7 1 Backpack EEPROM. This tests the EEPROM (static memory) in the backpack processor, which contains user-selectable configuration information, for internal errors or data corruption. 6=Bad EEPROM 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. 8 1 Battery ROM / RAM / Fuses.
Poseidon MKVI User Manual T# Time (sec) Description Appendix 1 Page 74 Error Code Solution 18 4,5 HUD LED. This test measures the amount of electrical current consumed by the red LED in the Head-Up Display (HUD), when activated. 11=Current too low 12=Current too high 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.
Poseidon MKVI User Manual T# Time (sec) Description Appendix 1 Page 75 Error Code 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. 29 4,5 Audio Alarm Speaker. This test measures the amount of electrical current consumed by the speaker in the battery (Audio Alarm), when activated. 11=Current too low 12=Current too high 30 7,5 Oxygen Cylinder Pressure Sensor Validation.
Poseidon MKVI User Manual T# Time (sec) Description Appendix 1 Page 76 Error Code Solution 39 120 Intro Test. 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.
Poseidon MKVI User Manual T# Time (sec) Description Appendix 1 Page 77 Error Code Solution 45 120 Sufficient Diluent Supply Pressure. This test requires that the diluent cylinder contains sufficient pressure for a dive to be started (at least 25% of maximum capacity).
Poseidon MKVI User Manual T# Time (sec) Description Appendix 1 Page 78 Error Code Solution 51 120 Helium Fraction Confirmation test. This test will be run if a rig is enabled for decompression or if the diluent configuration is not air. It will display the assumed fraction of Helium in the diluent. 0=time out 1)Ensure to confirm fraction via wet switch wet procedure. 2) If test failure persists, contact an authorized Poseidon Service Center for repair. 52 120 Oxygen Fraction Confirmation test.
Poseidon MKVI User Manual T# Time (sec) Description Appendix 1 Page 79 Error Code Solution 69=Secondary Dil. Low 70=Secondary Dil.
Poseidon MKVI User Manual Appendix 1 Page 80 Category Description Solution Mouthpiece 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) on the Primary Diplay (see Chapter 3).
Poseidon MKVI User Manual Appendix 2 Page 81 Appendix 2 DECO 40 / DECO TRIMIX 48 / DECO TRIMIX 60 1. Introduction The MKVI can support decompression diving. To be able to perform decompression dives, you need two things: 1) the appropriate training, and 2) a decompression-enabled battery module. The decompression battery module is available in three versions: Blue, Yellow or White. - The Yellow battery module allows decompression dives to a maximum depth of 40m with air as a diluent.
Poseidon MKVI User Manual Appendix 2 Page 82 2. Assembly Technical 60 m Counterlungs to BCD / Harness / Regulators Attach the counterlungs to the shoulder straps of your BCD/Harness using the velcro straps on the back side of each counterlung. Upper counterlung shoulder strap to tank band connection. Connect the small male plastic clip on the upper part of the counterlung to the female plastic clip attached to the tank strap on the same side as the counterlung.
Poseidon MKVI User Manual Appendix 2 Page 83 Manual addition Rear CC hoses to counterlung T-connections. Connect the T-connection to the top port in each counterlung. Refer to chapter 1 section 4 and 5 for more information about how to connect the T-connections and CC hoses. Radial seal surface The additional ports on the counterlungs can be used for Oxygen and Diluent manual gas addition valves for technical diving capabilities.
Poseidon MKVI User Manual Appendix 2 Page 84 Routing the inflator hoses Connect the the O2 inflator hose “marked O2” to your onboard O2 gas supply (or any other offboard source). Route the hose over your right shoulder and connect to the O2 inflator valve though the quick connection. Connect the the diluent inflator hose to your onboard diluent gas supply (or any other offboard source). Route the hose over your left sholder and connet to the diluent inflator valve though the quick connection.
Poseidon MKVI User Manual Appendix 2 Page 85 3. Configuring the MKVI for decompression diving The MKVI can be set up differently for different types of dives through the PC configuration software tool. This tool can be downloaded from the Poseidon website, www.poseidon.com Decompression permitted The Blue, Yellow and White batteries are configured by the factory to allow decompression diving.
Poseidon MKVI User Manual Appendix 2 Page 86 4. Pre-Dive Procedures with a MKVI enabled for Decompression Diving It is possible to determine whether a rig is configured for decompression diving by examining the ceiling indicator during the pre-dive routine. The ceiling indicator will be blank for a standard rig and will flash for a MKVI enabled for decompression diving.
Poseidon MKVI User Manual Appendix 2 Page 87 6. Decompression Diving with the MKVI A MKVI enabled for decompression diving will behave differently compared to a MKVI that is not configured for decompression diving. Important changes in the functionality when a diver approaches and enters decompression are: • • • diluent is insufficient to reach the surface.
