Hollis Prism 2 - PRISM 2 Operational Checklist Level 2 W;Prompts

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PART 2 . Section 6
1. Assembly Checklist Completed
2. Install Analyzed + Labeled Gas Cylinders
3. Turn On Wrist Display.
A. Check O
2
cell mV readings in air
(acceptable: 8.5 mV to 14 mV - replace if needed)
B. Change to Setpoint .19 (8 X MENU - Left Button)
4. Turn On HUD − Check Battery Status
5. Oxygen System Leak Test
(hold for 30 seconds minimum)
A. Slowly open oxygen valve, pressurize hoses, close valve
B. Watch oxygen pressure gauge for pressure loss
C. Slowly open oxygen valve
6. Negative Pressure Test (hold for 1 minute minimum)
A. Open DSV/BOV
B. Inhale from DSV/BOV in CC mode, exhaling through nose
until counterlungs are fully collapsed
C. Close DSV/BOV
D. Allow to sit for one minute; watch for signs of leaks.
7. Positive Pressure Test (hold for 1 minute minimum)
A. Close OPV
B. Fill loop fully with oxygen using manual oxygen
addition valve until OPV vents
C. Allow to sit for one minute, watch for signs of leaks
D. Open DSV/BOV, evacuate loop contents
8. Flush Loop (2 times)
A. Close DSV/BOV
B. Fill loop with oxygen until OPV vents
C. Evacuate loop fully
D. Repeat steps A. & B.
E. Open DSV/BOV to equalize pressure to ambient
pressure. Close DSV/BOV.
9. Calibrate Wrist & HUD
Wrist Display:
A. Menu to calibrate (2 X MENU − left button)
B. Press Select (right button) twice to calibrate
C. Check mV readings in O
2
(acceptable: 40.6 mV - 66.9 mV)
HUD:
A. 3 rapid presses (within 1 second) on Heads Up Display
piezo power switch
10. Check Solenoid & Wrist Display Battery
A. Setpoint to high (>1.1)
B. Solenoid fires, O
2
injection verified
C. Change setpoint to .19
D. Solenoid and wrist display battery check
[acceptable: Ext V ≥ 7 / Int V ≥ 3.18] (6 X SELECT − Right button)
11. Install Cover
12. Diluent System Leak Test (hold for 30 seconds minimum)
A. Open diluent cylinder
B. Watch diluent pressure gauge for pressure loss
C. Open diluent cylinder
13. Check ADV, BOV if equipped, and BCD
A. Inhale from onboard alternate air source if supplied
B. Open DSV/BOV, inhale from loop until ADV engages, dropping
loop PO
2
C. BCD Ination + deation mechanisms → air holding
14. Pre-Breathe (5 minutes)
A. Change wrist display to low setpoint
B. Block nose and begin breathing from the PRISM 2 (in a safe
location)
C. Observe setpoint maintenance
If Diving Immediately:
Continue with “Pre-Dive Checks”.
If NOT Diving Immediately:
Close O
2
+ diluent cylinder valves, drain hoses, turn off electronics, and
secure unit.
Pre-Dive Checks:
15. Weights
16. HUD And Wrist Displays On
17. Tank valves open
18. Verify Setpoint And Loop Contents
19. Don The PRISM 2
20. Pre-Jump (See hang tag on rebreather)
A. Begin Breathing Unit
B. Check: ADV/BOV, O
2
Add, Dil Add; BCD
C. Check SPG: O
2
, Dil; OC
D. Observe Setpoint Maintained
E. Always Know PPO
2
& Have Fun
Name: Date: / /
Intra -Dive: No Yes
Scrubber: New Used
Total Time Used On Scrubber:
Maximum Scrubber Duration:
240 min (0.5% SEV CO
2
) using
6-12 @ 40 °F/4.4 °C, 1.35 slpm CO
2
,
40 lpm RMV, 60 fsw/28 msw
PRISM 2 OPERATIONAL
CHECKLIST
le vel 2 w/pr omp ts