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Hollis Prism 2 User Manual

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USER MANUAL
REV. 13

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  • Page 1 USER MANUAL REV. 13...
  • Page 2 Document #: 12-4072 Rev. 13 Release Date: 1/1/19 This manual, specifications and features of the PRISM 2 are proprietary and copyright Hollis Rebreather, LLC, 2019. This document may not be copied or distributed without the prior agreement and authorization from Hollis Rebreather, LLC.
  • Page 3 Dr. Richard Pyle Sharon Readey Kevin Watts NOTE: Hollis PRISM 2 eCCR Information on the operation of the Prism 2 User Manual electronics can be found in the Shearwater Petrel User Document Control Number: Manual which can be downloaded from https://www.
  • Page 4 Hollis PRISM 2 rebreather. This includes new PRISM 2 divers as well as PRISM 2 certified divers who have been away from diving for an extended period of time and would benefit from an instructor-led refresher course to regain skills mastery of the Hollis PRISM 2.
  • Page 5 The user must maintain all parts of the PRISM 2 that can come into contact with high-pressure oxygen as oxygen- clean components. This includes scheduled servicing by a Hollis service professional, and using approved oxygen- compatible lubricants on any part of the gas delivery systems that will come into contact with high-pressure oxygen.
  • Page 6 17 pounds negatively buoyant (not including any user-added weight or offsetting buoyancy inflation). It is the responsibility of the diver to insure that the Hollis PRISM 2 is never weighted in such a way that it is not possible for the installed buoyancy device to overcome the flooded weight of the unit plus any diver-added non-detachable weights, and still provide enough positive buoyancy at the surface to keep the divers head well above water.
  • Page 7 Prism 2, should you begin to feel the onset of nausea, immediately switch to an appropriate open circuit bailout as soon as you can perform the task safely, and abort the dive. Consult your PRISM 2 instructor for...
  • Page 8 Image courtesy of Rhett Allain, Wired WARNING: OPERATIONAL RANGE The PRISM 2 has been tested and qualified for use in water depths of up to 328 ft (100 m) and water temperatures between 39° - 93° F (4° - 34° C).
  • Page 9 - If using a BOV with a PRISM 2 in water colder than 50°F/10°C, you must use an approved Hollis PRISM 2 Environmentally Sealed Regulator First Stage for the diluent supply gas.

  • Page 10: Table Of Contents

    FITTING YOUR PRISM 2 CAPACITIES, & SPECS ARTICLE: STABILITY SECTION 1 LIST OF APPROVED PRODUCTS PART 2 SETUP FOR USE IN YOUR PRISM 2 SECTION 2 SECTION 1 COMPONENT CAPACITIES + SPECS AN O-RING CLEANING PRIMER SECTION 3 SECTION 2...
  • Page 11 REBREATHER Y. THAT IS WHY WE WRITE THESE MANUALS. TAKE A PAUSE AND RE- READ THE MANUAL IF IT HAS BEEN A WHILE SINCE YOU HAVE BEEN DIVING YOUR PRISM 2. IT CAN MAKE ALL THE DIFFERENCE BETWEEN A GREAT OR TERRIFYING DIVE.

  • Page 12: System Overview

    “sport” rebreather. The PRISM 2, like its predecessor the PRISM Topaz, is a digitally controlled electronic closed circuit rebreather with split front-mounted over the shoulder counterlungs (OTS-CL) or Back Mounted Counterlungs (BMCL). It incorporates a radial design scrubber for the best possible duration and work- of-breathing.

  • Page 13: Schematics + Design

    SCHEMATICS + DESIGN THE GAS PATH The PRISM 2 incorporates an over-the-shoulder split counterlung design or a back mounted counterlung. The gas flows through the loop from left to right shoulder in both the Front-Mounted Counterlungs and the Back-Mounted Counterlungs, as has become a standard in the recreational rebreather market.
  • Page 14 The Red CO seal must be in place at all times during diving operations! WARNING: BREATHING FROM THE PRISM 2 WITHOUT THE RED CO SEAL IN PLACE WILL RESULT IN 100% GAS BYPASS OF THE SCRUBBER.
  • Page 15 THE COUNTERLUNGS: FRONT MOUNTED (FMCL) THE INHALATION COUNTERLUNG The inhalation counterlung is a 3.5 L or optional 2.5 L (currently available in the USA market only) front-mounted split counterlung design (Fig. 1.5) made of Fig. 1.5 rugged nylon with a food-grade urethane interior. It houses the automatic diluent ad- dition valve (ADV), counterlung drain, hose mounting hardware and BCD inflation hose wrap at its front.
  • Page 16 DSV or BOV hose? - The CRITICAL differences! DSV Inhalation side fitting BOV Inhalation side fitting You will notice that the mounting hardware for the DSV also holds the inhalation mushroom valve while the mounting hardware for the BOV does not. In the BOV, the mushroom valve is contained inside the BOV in a separate mushroom valne holder.

  • Page 17: Part

    When the lever is in the top position, the valve in closed circuit mode. The lower position is open circuit bail-out. The BOV can be used with the Front-Mounted or Back-Mounted Counterlungs. The Bail Out Valve operation manual can be found on the Hollis Rebreather website. 17 |...
  • Page 18 WARNING: IT IS IMPERATIVE THAT YOU USE THE CORRECT ATTACHING HARDWARE FOR THE MOUTHPIECE YOU INTEND ON USING. THE DSV ATTACHING HARDWARE AND BOV ATTACHING HARDWARE ARE NOT INTERCHANGEABLE. HOLLIS HAS TAKEN EVERY REASONABLE DESIGN PRECAUTION TO INSURE THAT Fig. 1.21...

  • Page 19: Part

    ATTACHING HARDWARE FOR THE MOUTHPIECE YOU INTEND ON USING. THE DSV ATTACHING HARDWARE AND BOV ATTACHING Fig. 1.25 HARDWARE ARE NOT INTERCHANGEABLE. HOLLIS HAS TAKEN EVERY REASONABLE DESIGN PRECAUTION TO INSURE THAT INCORRECT HARDWARE COMBINATIONS ARE OBVIOUS AND NOT DIVABLE, HOWEVER A DILIGENT, TRAINED DIVER MUST BE PART OF THE SAFETY EQUATION.
  • Page 20 Manual Gas Addition Blocks Diluent Addition Block The top of the manual Diluent Addition Block gas supply houses a standard threaded inlet supply hose and returns to the Inhalation T-Piece just below the ADV swivel through a QD connected hose (Fig. 1.26). On one side of the block is a blue, un-shrouded gas injection button and on the other side a pronounced relief with a hole for mounting the block as the diver prefers.

  • Page 21: Part

    BATTERY COMPARTMENT COVER The battery compartment cover (Fig. 1.17) is made of Stainless Steel. The cover utilizes two O-rings for redundant water tightness, a radial seal on the lip of the cover and a compression seal on the top of the battery compartment housing. There is an automatic pressure relief valve built into the top of the cover to vent excess pressure should the battery compartment flood or the solenoid lose gas Fig.

  • Page 22: Article: Taking Care Of Your Oxygen Sensors

    Duracell D battery is your first clue in understanding how they should be handled. WHAT MATERIALS ARE USED TO MANUFACTURE THE HOLLIS PRISM 2 SENSORS? The body of the sensor is made of High-Density Polyethylene (HDPE). The membrane on the front of the sensor is a thin Teflon gas permeable membrane.
  • Page 23 HOW DOES A CHANGE IN AMBIENT TEMPERATURE INFLUENCE THE O SENSOR’S PERFORMANCE? Temperature influences the signal output at a rate of 2.54% per °C. Gradual ambient changes in temperature can be maintained within ±2% accuracy by processing the signal output through the resistor - thermistor temperature compensation network.
  • Page 24 WHAT HAPPENS WHEN THE O SENSOR HAS BEEN EXPOSED TO WATER? The collection of condensation on the sensing surface of the sensor (standing water) reduces the signal output. Once either drying or gravity removes the standing water, the signal output will return to normal within 30 seconds. For example, a thin layer of water over the sensing surface will reduce the signal output of a sensor from 11.8 mV to 10.1 mV within 20 minutes;...
  • Page 25 WHAT IS THE EXPECTED OXYGEN SENSOR LIFE? The operational life of the Hollis (PRISM 2) sensors are calculated as one year from the date they are put in service. There is a “DO NOT USE AFTER” (date) also. Whichever date comes first is the proper time to discontinue sensor use.
  • Page 26 ARE THE O SENSORS DATE CODED? Oxygen sensors have a finite life. Understanding the date code is vital to getting the benefit of the warranty period. As an example, the serial number 10734789 breaks down as follow: Digit #1 a (1) denotes the year of manufacture as 2011; digits #2, #3 (07) indicate July as the month of manufacture;...
  • Page 27 SOLENOID The PRISM 2 solenoid (Fig. 1.28) is a low power (0.65 watt) normally closed elec- tromagnetic valve mounted in an isolated compartment in the head. The normally closed solenoid will only allow gas to flow when an electrical current is applied and the valve is momentarily opened.
  • Page 28 THE SOLENOID +THE PID CONTROLLER The PRISM 2 Solenoid is controlled by state-of-the-art PID Control loop feedback circuitry (The Controller). The PID Controller makes calculations based on an error value which is calculated as the difference between a measured process variable (how much oxygen is in your loop) and a desired setpoint (the O setpoint).
  • Page 29 Variables that impact on the process other than the manipulated variable are known as disturbances. Generally controllers are used to reject disturbances and/or implement setpoint changes. Changes in feed water temperature constitute a disturbance to the faucet temperature control process. In theory, a PID controller can be used to control any process which has a measurable output, a known ideal value for that output and an input to the process that will affect the relevant process value.
  • Page 30 BUCKET O-RINGS There are two red bucket sealing O-rings (Fig. 1.32) for redundant sealing of the breathing loop. Standard user maintenance during system set-up and tear-down are required. WARNING: FAILURE TO CHECK, CLEAN AND REPLACE THE BUCKET SEALING O-RINGS AT THE FIRST SIGN OF WEAR CAN LEAD TO A CATASTROPHIC FLOOD OF THE SYSTEM LEADING TO INJURY OR DEATH.
  • Page 31 + DILUENT FIRST STAGES All PRISM 2 first stages (Fig. 1.37) have been oxygen cleaned and assembled in a clean room environment with specially designed materials, halocarbon-based lubricants and color-coded for easy identification on and off the PRISM 2 chassis (green=O , Black=Dil).

  • Page 32: Fitting Your Prism 2

    If you have any questions, or need help finding which set-up works best for you, ask a PRISM 2 Instructor, or go into your lo-cal Hollis dealer. They will be more than happy to help you get your rebreather properly fitted.
  • Page 33 STABILITY ARTICLE BY GERARD NEWMAN What is stability? Briefly, it’s the ability to choose and maintain your position in the water column. When we have a stable platform for diving we are more comfortable, in better control and better able to observe our underwater surroundings. Diving with a CCR adds some additional considerations for stability.
  • Page 34 Counterlung position should be such that they are as close to your lungs as possible, both in the vertical and horizontal planes (Fig. 1.42). This will minimize static lung loading and decrease the work of breathing. The bottoms of the OTS counterlungs should be secured to the waist strap to hold them in place when they are inflated and become buoyant.

  • Page 35: Part 2 Setup

    O-rings in the Hollis PRISM 2 for use, below. In the checklist “step-by-step” to follow, unless there are unusual design, access, or handling considerations for a particular O-ring, we will simply state, “Remove, clean and prepare the O-ring(s), O-ring groove and mating surface...

  • Page 36: Packing The Prism 2 Co Scrubber

    * See PART 5 section 2 for list of approved adsorbent material. Fig. 2.4 The PRISM 2 scrubber is easy to pack, and with experience should only take 5 to 10 minutes from set-up to clean up. Find a dry area away from and downwind of other people. If necessary, take a moment to let people around you know that you will be working with caustic materials, and request they stay upwind from where you will be working.
  • Page 37 Spread out a towel or other soft covering on the ground in a flat area, and lay a few sheets of paper towel or newspaper on top of that. Place the bottom foam pad (larger center hole) in the basket making sure it lays flat against the bottom and sides of the basket (Fig.
  • Page 38 With the basket on the towel-covered ground, gently begin tapping the basket where the vertical and horizontal braces meet (Fig. 2.9). This will begin to settle the granules in the basket. The trick is to tap hard enough on the cross braces that the vibrations cause the material to settle, but not so hard that the granules jump around.
  • Page 39 3 TAPS THEN TURN Once you have tapped the basket 3 times on the ground, turn the basket top until in makes contact with the adsorbent. Do not force the top! Tap 3 times again and turn the top. Repeat this process until the top is sealed completely on the threads.
  • Page 40 PRE-PACKING THE PRISM 2 SCRUBBER While prepacking the scrubber well in advance of a dive, or transporting packed scrubbers is not advised due to potential adsorbent settling issues, we recognize there are instances where packing a scrubber on-site is either impractical or impos- sible.

  • Page 41: Using Checklists

    He vowed never to make that mistake again. WARNING: THE IMPORTANCE OF WORKING WITH CHECKLISTS WHEN SETTING UP YOUR PRISM 2 CANNOT BE OVERSTATED! IF YOU HAVE NOT SET-UP YOUR PRISM 2 USING THE CHECKLISTS, DO NOT DIVE THE REBREATHER. 41 |...
  • Page 42 We have broken the PRISM 2 checklists into 4 distinct sub-lists which should follow the steps encountered in the majority of real world diving situations.
  • Page 43 This section of the checklist is used to help you verify that all parts of a complete PRISM 2 are present and visually undamaged prior to packing it for transport. There is nothing worse than boarding a local dive boat or landing in a foreign country just to find out that you left your DSV/BOV in your dive locker back home.

  • Page 44: Component Inspection Checklist

    COMPONENT INSPECTION CHECKLIST KEY: WEAR / OPERATION / INSTALL 1. Check H-Plate / Harness / BC for Wear, 6. Inspect Wiring Damage or Missing Parts A. Heads Up Display (W) A. H-Plate B. Wrist Display (W) B. Harness (W) C. Fabric (W) 7.
  • Page 45 COMPONENT INSPECTION CHECKLIST: DETAILS KEY: WEAR / OPERATION / INSTALL 1: CHECK H-PLATE / HARNESS / BC FOR WEAR, DAMAGE, OR MISSING PARTS: 7 STEPS A: H-Plate Look for any bent or broken parts on the H-plate. Verify that the rubber cylinder pads are in place on the cylinder rests.
  • Page 46 E: Dump valve(s) (O, W) Inspect the buoyancy compensator dump valves. Momentarily open each valve and let a bit of air from the buoyancy compensator out to make sure they open and close freely. Also inspect the air dump pull cords (Fig. 2.17) to make sure they are in good condition and not entangled.
  • Page 47 Sniff the air inside of the counterlungs. It should smell clean and possibly have a hint of sanitizer smell to it. This is normal when using Hollis approved breathing loop cleaners, however a distinct smell of mold mildew or any other strong odor is not normal and is either due to inadequate sanitizing or not allowing the counterlungs to dry fully before storing.
  • Page 48 C: Threaded DSV/BOV assembly rings (FMCL) (W) Fig. 2.22 Check for cracks and thread stripping. The hose mounting rings (Fig. 2.22) are welded to the counterlungs. Make sure the rings are firmly attached to the counterlung fabric. C: Threaded T-Piece assembly rings (BMCL) (W) Check for tightness, cracks or other damage.
  • Page 49 E1: FMCL O Addition valve Check the oxygen addition valve for tightness by holding the base of the valve from the back of the counterlung through the counterlung fabric and attempt to tighten (twist clockwise) the threaded nut (Fig. 2.28a). There should be no movement.
  • Page 50 3: INSPECT DSV/BOV BREATHING HOSES: 4 STEPS A: Inhalation & exhalation hoses FMCL/BMCL(W) While holding the hose by the threaded hose nuts, gently stretch them to insure the ends are secure. If there is any movement, check the hose clamps and hose material next to the clamps (Fig.
  • Page 51 (only on inhalation hose for DSV supplied systems) Fig. 2.35 If your PRISM 2 is supplied with a DSV, the inhalation side breathing hose will house a one-way mushroom valve (Fig 2.36). (The inhalation mush-room valve on BOV supplied systems is housed in the BOV on the inhala-tion side of the BOV body).
  • Page 52 4: INSPECT DSV/BOV: 5 STEPS A: Shut-Down/OC assembly (O) Open and close the DSV/BOV to make sure the inner barrel operates smoothly and does not bind. If it is hard to open or close, or if you hear a scraping sound during barrel movement, the DSV/BOV barrel and housing will need to be cleaned and lubricated.
  • Page 53 If there are signs of water ingress, do not dive the unit until the first stage, hoses and pressure gauges attached to it have been serviced by a Hollis authorized repair facility. Failure to properly main-tain the first stages could result in a free-flow of gas into the breathing loop and lead to serious injury or death.
  • Page 54 30 seconds, the Heads Up Display battery must be changed. Once checked, turn off the HUD. (See the HUD light states section of the PRISM 2 Displays and Electronics User Manual for display explanations.) Fig.
  • Page 55 For the computer to measure the dynamic load of the solenoid battery, the PRISM 2 must have a valid calibration stored in memory to allow the solenoid to fire. If, when you turn on the Wrist Display, all three sensors display “fail”, the solenoid will not fire and the voltage display for the solenoid...
  • Page 56 (Fig. 2.48). Operate the latches and check that they are free of debris, and the locking mechanism locks firmly into place. Damaged latches must be replaced before immersing the PRISM 2 in water. Failure to keep the battery compartment latches in working order can result in flooding of the battery compartment.
  • Page 57 To check the solenoid operation now, you will need to hook up the oxygen side 1st stage, solenoid supply hose and a pressurized oxygen cylinder to the solenoid and power up the PRISM 2 to check that the solenoid is firing and adding O to the breathing loop.
  • Page 58 9: INSPECT HEAD ASSEMBLY: 5 STEPS A: Red CO Seal (I, W) The Red CO Seal is a thick, spongy-feeling red gasket that resides on the underside of the head in a channel on the face of the head plate adjacent to the three O sensors Fig.
  • Page 59 Clean any debris (usually small particles of soda lime) and lubricant on the O-rings with a lint-free towel. Once clean, run the O-rings through your fingers feeling for any nicks or left over debris while visually inspecting them at the same time.
  • Page 60 D: Bucket latch keeper (W, O) The bucket latch keeper is a stainless steel channel that runs around the face of the head and is screwed into place. Verify that the 4 screws are in place and the seat is not loose (Fig. 2.55). If the seat were to fail during a dive, the Velcro bucket strap would most likely keep the bucket firmly seated on the head, however with a failed latch keeper, a catastrophic flood could result.
  • Page 61 BLU & BLK = C: mV readings within range (O) (8.5 mV to 14 mV in air) The Analytical Industries Hollis (PRISM 2) PSR11-39-MD O sensor voltage output should be between 8.5 and 14 mV in air, and 40 to 67 mV at sea level in...
  • Page 62 Verify that the locking mechanisms lock firmly into place. WARNING: DAMAGED OR WORN LATCHES MUST BE REPLACED BEFORE IMMERSING THE PRISM 2 IN WATER Fig. 2.61 OR COMMENCING DIVING OPERATIONS. FAILURE TO...
  • Page 63 12: BASKET ASSEMBLY (W): 4 STEPS The basket assembly comes in four basic parts (Fig. 2.62): the basket, the basket lid, the center tube and the center tube O-ring. The basket assebly utilizes a strong nylon mesh to avoid rips and is also somewhat elastic so it will not create dust by abrading the adsorbent along its walls during packing, transit or handling.
  • Page 64 C: Top + basket threads clean (O) Keeping the scrubber clean is very simple, but one of the problems be-tween cleaning is crushed adsorbent dust caking up in the scrubber basket threads (Fig. 2.63). The more humid the environment in which you are packing your adsorbent basket, the more you will find the material is building up in the threads.
  • Page 65 Assembly The following section details the assembly steps to assemble a fully functioning Prism 2. Please note that sections which detail steps applicable to all builds (FMCL & BMCL equipped Prism 2s) will not have a build specific header at the top of the page.
  • Page 66 PRISM 2 ASSEMBLY Now that you are intimately familiar with the intricacies of every part that makes up an operational Prism 2, we will begin the Assembly process by mating the only 3 parts of the rebreather that require one-time assembly with tools.
  • Page 67 F M C L FMCL ASSEMBLY ORDER CHECKLIST Fill scrubber basket with CO adsorbent + store in airtight container. Label Container: Date Packed, Grade, Time Used, Time Left, User Date Packed: _______ Grade: _______ Time Used: _______ Time Left: _______ User: _______ Maximum Scrubber Duration: EN 14143 conforming testing: •...
  • Page 68 B M C L BMCL ASSEMBLY ORDER CHECKLIST Fill scrubber basket with CO adsorbent + store in airtight container. Label Container: Date Packed, Grade, Time Used, Time Left, User Date Packed: _______ Grade: _______ Time Used: _______ Time Left: _______ User: _______ Maximum Scrubber Duration: EN 14143 conforming testing: •...
  • Page 69 WARNING: ONLY USE HOLLIS TESTED AND APPROVED ADSORBENT GRADES AND BRANDS. OTHER ADSORBENTS MAY NOT PERFORM AS EXPECTED OR BE SAFE FOR USE IN THE PRISM 2. WARNING: NEVER EXCEED THE STATED MAXIMUM DURATION OF ADSORBENT. DOING SO WILL EVENTUALLY LEAD TO SERIOUS INJURY OR DEATH.
  • Page 70 FAST FILL AN OXYGEN CYLINDER AND ALLOW A “HOT” CYLINDER TIME TO COOL TO AMBIENT TEMPERATURES BEFORE USE. *NOTE: You can dive the PRISM 2 using oxygen of less than 100% purity. See the “Cal. PPO Function” in the PRISM 2 Displays and Electronics User Manual for instructions to do so.
  • Page 71 3: INSTALL REGULATORS + HOSES ON H-PLATE Install the oxygen regulator and hoses on the right side of the H-plate by running all the hoses under the bottom tank band strap on the inside of the tank bracket with the DIN valve facing outward toward where the tank will be installed. Leave the Solenoid feed hose (shortest hose) loose.
  • Page 72 F M C L 4: INSTALL BLADDER, YOKE + BACKPLATE ONTO H-PLATE: 4 STEPS A: Install carriage bolts onto H-Plate and secure with nylon keepers. Install both carriage bolts into the square bolt holes in the H-Plate and secure them in place with a nylon bolt keeper. (Fig. 2.73) B: Install BCD on H-plate (inflator facing H-plate) Carefully install the bladder onto the 2 harness mounting bolts of the H-plate, making sure that the inflator mechanism is facing the H-Plate (Fig.
  • Page 73 F M C L D: Install the counterlung side straps to the backplate Using bookend screws attach both counterlung side straps to the circular hole above the waist strap on both sides of the waist strap (Fig 2.76). E: Install the counterlung pull down straps to the waist strap Fig.
  • Page 74 F M C L 7: INSTALL COUNTERLUNG BREATHING HOSES TO HEAD : 2 STEPS A: Clean/Lubricate O-rings, O-ring Grooves And Mating Surfaces Remove, clean and prepare the O-ring(s), O-ring groove and mating surface for use, or replace if worn or damaged. Fig.
  • Page 75 F M C L 9: ASSEMBLE DSV/BOV AND HOSES, CHECK AND INSTALL: 6 STEPS In steps 3 & 4 of the pre-assembly checks you verified the operation of the three main sub-assemblies that make up the DSV/BOV assembly. Now you will put together the assembly, check its operation and install the assembly on the counterlungs.
  • Page 76 F M C L E: Install DSV/BOV onto counterlungs paying attention to flow direction arrow Take the inhalation side elbow and insert it into the counterlung at approximately an outward facing 45 angle (away from the unit’s center) (Fig. 2.80). Both elbows are keyed (Fig.
  • Page 77 B M C L 4: INSTALL BLADDER, YOKE + BACKPLATE ONTO H-PLATE: 4 STEPS A: Install carriage bolts onto H-Plate and secure with nylon keepers. Install both carriage bolts into the square bolt holes in the H-Plate and secure them in place with a nylon bolt keeper. (Fig. 2.84) B: Install BCD on H-plate (inflator facing H-plate) Carefully install the bladder onto the 2 harness mounting bolts of the H-plate, making sure that the inflator mechanism is facing the H-Plate (Fig.
  • Page 78 B M C L 5: ATTACH COUNTERLUNGS TO HARNESS Undo the 3 piece Velcro strap and place the harness shoulder strap on top of the counterlung. Place the single Velcro piece (Loop side) between the double Velcro straps (Hook sides) and squeeze to lock the loop & hook together. Repeat for the other side.
  • Page 79 B M C L 7: INSTALL COUNTERLUNG BREATHING HOSES TO HEAD : 2 STEPS A: Clean/Lubricate O-rings, O-ring Grooves And Mating Surfaces Remove, clean and prepare the O-ring(s), O-ring groove and mating surface for use, or replace if worn or damaged. Fig.
  • Page 80 B M C L 9: ASSEMBLE DSV/BOV AND HOSES, CHECK AND INSTALL: 6 STEPS In steps 3 & 4 of the pre-assembly checks you verified the operation of the three main sub-assemblies that make up the DSV/BOV assembly. Now you will put together the assembly, check its operation and install the assembly on the counterlungs.
  • Page 81 B M C L D: Perform a mushroom valve sealing test (“stereo check”) Because the BMCL system is different from the FMCLs insofar as you cannot disconnect the breathing hoses to do a stereo check, you will have to fold over the hose to restrict airflow to test that the assembly will flow gas in one direction only and the valves are sealing properly.
  • Page 82 O-rings that could cause a leak during dive operations. If the PRISM 2 has been transported or disassembled in such a way that debris could have gotten on the O-rings, we recommend repeating this step. We have duplicated these steps here, instead of making you go back in the manual.
  • Page 83 11: CLEAN RED CO SEAL AND SECURE IN PLACE: 2 STEPS The Red CO Seal is a large soft red silicone gasket that resides on the underside of the head in a channel on the face of the head plate, next to the three O sensors (Fig.
  • Page 84 B: Check for settling and firmness of adsorbent bed Just as you do when packing the basket, feel the adsorbent from bottom to top. It should feel evenly dense throughout. Put slight pressure on the mesh by squeezing it. The applied pressure should not displace grains of adsorbent. If the adsorbent is not tight and even throughout, you must re-pack the scrubber.
  • Page 85 14: PLACE CO BASKET IN BUCKET, CONFIRM CENTER TUBE OPENING UP, MOUNT AND SEAL BUCKET TO HEAD Gently place the basket in the bucket making sure the center breathing tube is facing up. (Fig. 2.104) Push down on the basket top and make sure it springs back. If it does not move, you have either placed the basket in the bucket up side down, or the spring assem- bly is not working correctly.
  • Page 86 17. Tank Valves Open 7. Positive Pressure Test 18. Verify Setpoint And Loop Contents (hold for 1 minute minimum) 19. Don The Prism 2 8. Flush Loop (2 times) 20. Pre-Jump 9. Calibrate Wrist & HUD (See hang tag on rebreather.) (hold for 30 seconds minimum) 10.
  • Page 87 C. Close DSV/BOV A. Change wrist display to low setpoint D. Allow to sit for one minute; watch for signs of leaks. B. Block nose and begin breathing from the PRISM 2 while 7. Positive Pressure Test seated in a safe location) C.
  • Page 88 NOT skip around on the list. Good checklist habits are the best way to insure that you have assembled your PRISM 2 correctly, and insure you have not left out a critical step. 2: INSTALL ANALYZED + LABELED GAS CYLINDERS Place the diluent tank under the two tank straps on the divers left.
  • Page 89 4. TURN ON HUD - BATTERY CHECK Replaced & OK Turn the HUD power on with a single press of the switch on the side of the HUD and verify that the HUD runs through its start-up sequence (all LEDs illuminate, indicate up position then switch to O2 status or fault).
  • Page 90 6: NEGATIVE PRESSURE TEST (HOLD FOR 1 MINUTE MINIMUM) The negative pressure test will check for the types of leaks that may not show during a positive pressure test. These types of leaks are fairly rare but are just as potentially dangerous, so it is extremely important to perform the test.
  • Page 91 Worn O-rings in the DSV/BOV may also show up in the negative leak test. NEVER DIVE A PRISM 2 WHICH CANNOT PASS A POSITIVE OR NEGATIVE PRESSURE TEST AS IT INDICATES A COMPROMISED (NOT WATER TIGHT) LOOP.
  • Page 92 O sensors. NEVER DIVE A PRISM 2 WHICH CANNOT PASS A POSITIVE OR NEGATIVE PRESSURE TEST AS IT INDICATES A COMPROMISED (NOT WATER TIGHT) LOOP. LEAKS NEVER GET BETTER UNDERWATER! DIVING WITH A LEAKING LOOP CAN LEAD TO INJURY OR DEATH.
  • Page 93 “Cal. PPO ” value pro- .97 .98 .98 grammed into the computer during system setup (see “Cal PPO ” programming in the PRISM 2 Displays and Electronics User Manual). The system default is Cal. @ PO2= .98 0.98 PO Cancel Calibrate Fig.
  • Page 94 Also, recording the mV values in oxygen and comparing those values with previous values can give us a good indicator if we have done a thorough flush of the loop. For instance, if the last time you calibrated the system, the mV values were 55, but a week later they are outputting 45 mV post-flush, you may want to consider flushing more oxygen through the loop to see if those mV values increase as you add more O...
  • Page 95 0.7 ata O . The default range for low or high setpoints are 0.5 – .21 .21 1.4. The PRISM 2 Displays and Electronics User Manual contains full details on how to program setpoints. Dive Setup+ Fig. 2.107...
  • Page 96 DEPTH TIME STOP TIME 11. INSTALL COVER .21 .21 Ext V Int V Attach the PRISM 2 cover to the back of the unit to protect the scrubber head. 8.4 3.41 12. DILUENT SYSTEM LEAK TEST Fig. 2.112 This test will determine if there are any leaks in the diluent system.
  • Page 97 A: Inhale from onboard alternate air source if supplied If your PRISM 2 is equipped with a BOV, switch to open circuit mode and breathe from it to verify that it is operational. If your diluent system has multiple alternate air sources attached, switch from one to the other.
  • Page 98 After some trial and error you will figure out how much weight you will need to safely dive the PRISM 2. How you choose to distribute that weight is mostly a comfort issue, based on your physical build. The PRISM 2 has weight pockets sewn into the back of each counterlung.
  • Page 99 16. HUD AND WRIST DISPLAYS ON Turn on the HUD while watching the HUD LEDs. All LEDs on the HUD should begin to blink, reporting the O content of the loop. (As a reminder, If the HUD displays orange for 30 seconds at start-up, you must change the battery before diving.
  • Page 100 0.19 PO setting in the computer. Do not dive your PRISM 2 until you verify the computer is maintaining your pro- grammed loop PO 19. DON THE PRISM 2 Attach counterlung straps, crotch strap(s), cummerbund and waist strap, and tighten as needed.
  • Page 101 DO NOT DIVE THE still performs erratically with wild swings in PO REBREATER . It must then be evaluated and serviced by a qualified PRISM 2 Service Technician before any further use. E. Always know PPO Constantly monitor the breathing loop PPO to ensure a safe breathing gas and proper function of your PRISM 2.

  • Page 102: Post Dive Checklist

    POST-DIVE CHECKLIST Name: Date: / / 1. Verify and record batteries (Solenoid/Wrist Display). Solenoid battery: V:________ Good Replaced Wrist Display battery: V:________ Good Replaced 2. Turn off, Secure Wrist Display 3. Verify Heads Up Display Battery Good Replaced 4. Drain counterlungs of fluid 5.
  • Page 103 1: VERIFY AND RECORD BATTERIES (SOLENOID/WRIST DIS- PLAY) This is a good time to verify that the batteries in your PRISM 2 have enough power for continued use. Should you need to replace a battery, it is better to find out now than to be scrambling for new batteries during set-up.
  • Page 104 4: DRAIN COUNTERLUNGS OF FLUID Your exhale counterlung will have fluid in it which contains both water from your dive environment (fresh or salt) and saliva and other “bio-lube”. Open the counterlung drain. A viscous fluid, either clear or slightly milky white will drain from the exhale lung.
  • Page 105 NOTE: Why Sanitize Your Loop Daily? A rebreather “loop” collects all sorts of biological material during a dive. There is your saliva, which fortunately is composed of 98% water. However the other 2% consists of compounds such as electrolytes, mucous, blood and various enzymes that normally begin the process of breaking down food, and most likely food particulates from a recently eaten meal or snack.
  • Page 106 11: SANITIZE BUCKET ™ If you are using Steramine or other dissolving sanitizers, the scrubber bucket is a great vessel to mix up 1 gallon / 3.78 L of sanitizer and soak the breathing hoses, DSV/BOV and moisture pad, then pour the remaining sanitizer into the counterlungs to sanitize them.
  • Page 107 If parts are used from your spares kit, make note so that you can re-order replacements from your local Hollis PRISM 2 dealer. BMCL...
  • Page 108 If parts are used from your spares kit, make note so that you can re-order replacements from your local Hollis PRISM 2 dealer. | 108...

  • Page 109: Maintenance + Repair Log

    MAINTENANCE + REPAIR LOG Owner: _______________________________ Date of report: ___________ Reason for maintenance (check one) Pre-Dive Failure Post-Dive Maintenance Preventative/Scheduled Maintenance Part(s) Replaced Reason Parts needing service Action Operational observations Replacement part(s) need to be ordered to complete this maintenance Date Part(s) ordered: Expected delivery: Signed: 109 |...
  • Page 110 Hollis Prism 2 Rebreather Statement of Skill Competency & Course Completion Form Working with PRISM 2 Checklists CO2 Breakthrough & Hypercapnia Proper Dive Planning High Oxygen - Hyperoxia Calibrate & Validation of oxygen sensors Low Oxygen – Hypoxia Assembly and disassembly Diving with off-board bailout Post Dive care, user service & maintenance Off-board bailout assist of another diver requirements Emergency bailout with On-board and offboard Manufacturer resources & user software gas supplies Proper scrubber packing & limits Drop & Recover bailout cylinders while maintaining position in the water column Evaluating system operations Decompression procedures Use and adjustment of computer controls Maintain Safety/Decompression stop(s) In-water bubble check Oxygen Rebreather Mode Controlled descents and ascents Valve shutdown Dropping weights & establishing positive buoyancy on the surface Gas hemorrhages and free-flowing regulator DSV/BOV operation & use...

  • Page 111: Part 4 Maintenance + Cleaning

    MAINTENANCE + CLEANING SERVICE FACILITY & YOU It is necessary to have a Hollis PRISM 2 Service Facility complete a “Full Service” annually to maintain safe operation of your PRISM 2. You may find some items that need attention before your scheduled anual service. Hollis has developed a “PRISM 2 User Service Guide”...

  • Page 112: Routine Cleaning

    ROUTINE CLEANING RED CO SEAL Tools Needed: None If the gasket gets dirt or adsorbent dust on it, remove the gasket from its groove and clean the surface of the gasket with warm, soapy water, rinse and allow to air dry. The gasket should feel “gummy”...
  • Page 113 This will allow the interior of the lungs to dry while blocking bugs from getting in and making a home. For further disassembly see the “PRISM 2 User Service Guide” (doc. # 12-4091). DSV/BOV INHALATION HOSE + FITTINGS Tools Needed: Oetiker clamp pliers, large bottle brush, toothbrush, sponge, lubricant, Steramine™...
  • Page 114 O-rings, it is always a good idea to service the valve during more thorough cleanings. For further disassembly instructions see the “PRISM 2 User Service Guide” (doc. # 12-4091).
  • Page 115 There is usually no need to remove the center tube. It is recommended that it is left in place whenever possible, except during annual service. Should you need to remove the center tube see the “PRISM 2 User Service Guide” (doc. # 12-4091). 115 |...
  • Page 116 ALL OTHER EXTERNAL SURFACES Though Hollis uses the best materials available, UV rays, salt water, and chlorine environments can be harsh on equipment. For that reason, it is essential to rinse all components with fresh water after use and avoid unnecessary UV exposures (DO NOT leave to dry or store equipment in sunlight).

  • Page 117: Part 5 Approved Products, Capacities, & Specs

    DeoxIT® Gold GN5 Electrical Contact Cleaner Other products not listed may be appropriate for use with the PRISM 2. If there is a particular product which you wish to use, please call the factory to make sure the product does not contain chemical components which CAUTIONS: Consult manufacturer Material Safety Data Sheets for further safety recommendations for these materials.
  • Page 118 • 190 min (0.5%, SEV CO ) using 8-12 @ 40 °F/4 °C, 3.0 L/min CO , 18 fsw/6 msw TESTED OPERATIONAL RANGE OF THE PRISM 2 328 ft (100 m) of depth water temperatures between 39° - 93° F (4° - 34° C) BUCKET CAPACITY Total Capacity: 1.75 gallon / 6.6 Liter...

  • Page 119: Glossary

    GLOSSARY Adsorbent: chemical media used to remove CO from exhaled gas ADV: automatic diluent valve Bailout: redundant gas supply system BOV: bail out valve Breakthrough: where adsorbent scrubber fails, no longer remov- ing CO at an adequate rate Breathing Loop: parts of the rebreather that breathing gas circu- lates within Caustic Cocktail:...
  • Page 120 NOTES | 120...

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