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Date: Wed, 20 Sep 1995 09:38:36 -1000 (HST)
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
To: Jason Rogers <gasdive@sy*.DI*.oz*.au*>
Cc: techdiver@terra.net
Subject: Re: Accurate TMX analysis (George)


> This is the reason that I've only ever used Heliair.  I just can't
> see how you can get a reliable (or faintly credable) idea of your
> He/N2 ratio if you blow air (21%) onto Heliox.  How do you get
> around this problem without using pure gases.  (ie, He first, O2
> second, analyise, then pure N2, and reanalyse)

I'm not sure I follow you here.  I would fill the tank with some helium 
and oxygen to some pre-determined pressure, such that I get 21% O2.  I 
would then top-off with air, and would probably not even bother checking 
a second time (or maybe I would just because it is so easy, and to verify 
that I didn't accidently screw-up the first reading).  I would still be 
just as confident with the He:N2 ratio as I would with any other trimix. 
Am I mising something?

Aloha,
Rich

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