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Date: Sun, 2 Jun 1996 18:45:45 -0700 (PDT)
From: "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*>
To: Chris Hellas <chris@de*.de*.co*.uk*>
cc: techdiver@terra.net
Subject: Re: Physiologic safety parameters for SC rebreathers

Chris,

In reply to,

On Sat, 1 Jun 1996, Chris Hellas wrote:

> The trick before ascent is to flush the loop prior to commencing your
> ascent. This is done by inhalling the loop and exhaling through the nose
> three times. This should bring the FI O2 back up to something like even
> if you have been exercising hard. As far as generally exercising hard
> goes,the guy's @ Draeger are quite adamant that even with a metabolic
> oxygen consumption of 2.5 litres per minute (which is quite high!) the
> FO2 in the loop should not drop below 18 percent when the 50 percent O2
> orifice is used. I have not seen any data relating to the other orifices
> - I'll do some digging.

Where does this come from? It's not in the info that Uwatec/Drager is
circulating with the Atlantis in the US. I agree with you that exhaling
through the nose before ascending is the way to deal with this. My problem
is that sometimes you can ascend faster than planned ;-) and it would be
nice to know what the machine's parameters were, before such an event
happens.

Peter

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