Pre-Dive Check List

Based on the routine taught by Dave Thompson IANTD Instructor and designer of the Inspiration

Failure to follow this or a similar pre dive check list WILL shorten your life

Analyse Gasses
Analyse the O2 and diluent cylinder to verify their contents
Scrubber Duration
Verify scrubber log to ensure there is sufficient duration and reserve for your dive
Positive Pressure Test
    Screw counter lung pressure release valve to maximum
    Inflate counter lungs to full. Pressure release valve should operate. Close mouthpiece
    Leave inflated for as long as possible. Minimum of 5 minutes
    Test is failed if there is any noticeable deflation
Negative Pressure Test
    Screw counter lung pressure release valve to minimum
    Suck air from counter lungs until they are empty. Crush a breathing hose. Close mouthpiece
    Leave deflated for as long as possible. Minimum of 5 minutes
    Test is failed if there is any noticeable inflation or hose has recovered shape
O2 pressure test
    SLOWLY open oxygen cylinder
    Listen for pressure up and verify no obvious leakage
    Verify sufficient O2 pressure in cylinder
    Verify operation of O2 injector
Diluent pressure test
    SLOWLY open diluent cylinder
    Listen for pressure up and verify no obvious leakage
    Verify sufficient diluent pressure in cylinder
    Verify operation of diluent injector
    Verify operation of buoyancy injector
    Verify operation of bail out regulator
Computer initialisation
    Switch on master unit
        Listen for double beep and solenoid operation
    Switch on slave unit
        Listen for double beep and solenoid operation
    Verify No battery warnings
Calibration of Inspiration
    Perform a calibration at least once a day. If in doubt Calibrate
    If calibrating, actually check/do each of the pre-calibration steps
    If calibrating, observe all readings as they change. Look for
        Long duration of test
        Similar last figures on all cells. Make a note of these for comparison
    This is also a good time to calibrate any third party O2 monitors such as the VR3
Low O2 warning test
Flush system with diluent and verify low O2 warning actuation.
Verify ALL cells react equally
Pre-Breathe
    Breathe from unit for at least 3 minutes continuously prior to entering the water
    Verify unit sets and maintains a 0.7 ppO2 reading
    Ensure both counter lungs are fully fastened down