[JohnD]

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<font color='#F52887'>What is the minimum Partial pressure of O2 to sustain life at the surface? e.g. for normoxic trimix how low can you go on O2? I want to do my entry level trimix next year and I am looking into the theory but I cannot find where the books say the lower limit of O2.

 

[cthomas]

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<font color='#FF0000'>0.10 absolute minimum
0.12 start to lose consciousness
0.16 minimum to maintain full ability

this figures are from memory, but im sure if they are wrong they will be corrected by somebody (im 99% they are correct)

from what ive read myself, i think TDI Normoxic teaches/qualifies to mixes containing minimum 16% o2

 

[Mark Chase]

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TDI Normoxic is 18% with a + or - 1% tolerance you can leagaly run 17% on the cert card.

16 is suposed to be minimum 02 mix at surface presures

ATB

Mark Chase

 

[cthomas]

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<font color='#FF0000'>thanks mark

out of interest, what PPO2 does advanced trimix qualify to?

chris

 

[Rupert Bear]

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The original trimix course qualified you to use anything you want.
I regularly use 10% or less due to using heliair rather than trimix.