I am medically fit to undertake a CCR dive


Check Oxygen Tank Content

Check Oxygen Tank Pressure

Check CFM Valve - count drop in 10 Bar - should be around 10 seconds

Diluent and Bailout

Diluent and Bailout Tank(s) - Check Content - O2% and He%

Diluent and Bailout Tank(s) - Check Preassure

Monox PPO Display

Check Battery Plug

Turn on Display - working

Battery Check

Check calibration in Air (0.21-0.21-0.21 at sea level)

If sensors don't align as above - calibrate in Air

Shearwater Computer

Turn on Display - Working

Battery Check

Check calibration in air (0.21-0.21-0.21 at sea level) - if not calibrate in later step

Scrubber Canister

Filling of Canister done correctly?

Check - Canister internal O-Rings (Black and Red at bottom and black at top)

Check O-Ring in Canister lid

Close Canister - check markings - install snap ring

Conduct Positive and Negative Pressure Test on Canister

Counter Lungs

Fit Exhale Counter Lung (Ensure it is dry before fittiing)

Fit Inhale Counter Lung (Ensure it is dry before fitting)

Fit counter lung to canister


Visual Inspection of Mouthpiece and open/close mechanism

Check Mushroom Valve

Conduct Positive and Negative Loop Pressure Test

Conduct Loop Flow Gas Test

Loop Counter Lung connections

Gas Line

ADV/Exhale Counter Lung Connection

Tank First Stage Conneciton


Cell Housing / Inhale Counter Lung Connection

Positive and Negative Pressure Check

Conduct 2 minute Positive Pressure Check

Conduct 2 minute Negative Pressure Check


Oxygen Flush Conducted

Monox - If Calibration Required - Calibrate

Shearwater - If Calibration Required - Calibrate

Ensure all monitors agree


BCD and ADV Connection

BCD and ADV Operating Control

Pre Breath

Conduct 5 minute pre-breathe

Safety Checks

Conduct Pre-Dive Safety Check

Undertake O2 Flush at 5 meters - check cell readings

Open Diluent Valve and conduct Dill flush - check cell readings

Please note that this checklist is a hypothetical example and provides basic information only. It is not intended to take the place of, among other things, workplace, health and safety advice; medical advice, diagnosis, or treatment; or other applicable laws. You should also seek your own professional advice to determine if the use of such checklist is permissible in your workplace or jurisdiction.