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On Thu, 15 Dec 1994, Carl Heinzl wrote:
bw saving SNIP

>the
> standard limits for O2 Tox are 45 min at 1.6 atm, so if you back off
> of the max depth limit of Nitrox I a little (to a PPO2 of 1.5 atm)
> you'd be well within the save ranges for O2 Tox limits and since "rec"
> nitrox is done without planned deco, the dive time limits should be
> hit long before O2 Tox is reached.
What does this mean OxTox? I am quite aware that exposure to O2 at 
elevated pressures increases your susceptibility to an O2 hit but I have 
been trying to make some sense of this CNS clock and simply can't. People 
seem to take it as gospel. My sense is that each persons CNS clock varies 
widely and that the 45 min limit is akin to PADIs 130 ft depth limit. I 
base this on personal experience and 1st hand observation of what could 
be considered true abuse of the CNS clock as curently defined. 
Additionally it is my understanding that while the service used to give 
each diver a O2 tolerance test they have all but abandoned it due it's 
lack of any sense of predictability of O2 hits?
If I'm dreaming, someone wake me!
r.b.

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