User manual

Poseidon MKVI User Manual Appendix 1
Page 80
Category Description Solution
Mouthpiece
Absorbent
Cartridge
Cylinders
Electronics
Counterlungs
Pneumatics
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).
Cracked Absorbent Cartridge. The plastic housing of the SofnoDive
®
797
CO
2
absorbent cartridge can sometimes develop a crack if it is dropped
or due to mishandling during shipment.
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.
PO
2
Setpoint Limited to 1.0 bar / atm. The system is con gured for a
“deep” PO
2
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
15 m / 50 ft.
Counterlungs Shift Position Underwater. The counterlungs may shift position
underwater, floating up above the diver’s shoulders, or squeezing the
diver’s neck.
Leaking Fittings. A small stream of bubbles may be seen eminating from
one or more of the ttings on the open-circuit mouthpiece supply hose,
the hoses that connect the rst stage regulators to the pneumatics block
on the electronics module, or from one of the high-pressure sensors.
1) Ensure that the mouthpiece is fully in the OC or CC position (sometimes requires rm
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 Do NOT attempt to dive with a cracked absorbent cartridge. If gas leaks through the cartridge
wall, CO
2
may bypass the absorbent material, and enter the inhalation side of the breathing
loop, which can cause CO
2
poisining. Always replace a cracked cartridge with a new one.
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.
This situation occurs when the Hyperoxic Linearity Test fails, or has not been completed. This
test is performed the  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.
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 con ned body
of water to get them just right, but the effort is well worth it. Well-positioned counterlungs
reduce the work of breathing.
1) Ensure all ttings are snuggly attached; 2) Remove the hose from the leaking tting to
inspect the o-ring and sealing surfaces for signs of damage, and clean or replace o-rings as
needed; 3) If leaking persists, contact an authorized Poseidon Service Center or dive shop for
repair.