Check during dive

Criteria

Failure

Action

Pressure gauge pressure

<20 bar

>20 bar

- Close cylinder valve on IS-MIX

- Check that the reserve gas valve is pulled

- Perform by-pass and check that the pressure is <20 bar

- Consider aborting the dive if IS-MIX cylinder gas is different than DPX gas.

Reserve gas valve

Pulled out

Pushed in

- Pull out reserve gas valve

- Make sure IS-MIX cylinder valve is closed

Bypass

Function

Flow

No flow

- Open IS-MIX and bail-out cylinder valves

- By-pass

- Abort dive

- Perform emergency decompression schedule

IS-MIX warning.

(breathing resistance)

- By-pass

- Perform functionality checks

(Abort the dive if receiving repeated warnings, use by-pass during ascent)

- Open IS-MIX and bail-out cylinder valves

- Use switch-over valve

- Perform emergency decompression schedule

Diver trapped due to DPX hose tangled

- Open IS-MIX cylinder valve and bail-out cylinder valve

- Release DPX connection (follow DPX diving hose to surface if possible)

- Abort dive

- Perform emergency decompression schedule

Critical IS-MIX failure

- Use by-pass during inhalation

- Use switch-over valve

- Abort dive

- Perform emergency decompression schedule