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Good question Phil..

First, analyzing the remaining FO2 takes time. Second, and although I'll
probably get flamed for being a weenie, I don't trust o2 anylizers.. Third,
it's a much simpler operation to do a fill from scratch..  Calculating a
fill from scratch has fewer steps than topping off a previous mix;
lessoning the chance of a cluster fuck.  Yeah, yeah... You would catch it
when the gas is analyzed, but this is wasting more time.. 

Fourth, I pay extra for Nitrox.. It makes me feel good inside knowing I'm
getting my full monies worth. ;-)

Safe Diving


At 21:32 22/07/1998 -0500, Phi Le <PLe@Se*.co*> wrote:

>For Nitrox fills on top of nitrox gas, why would you need to empty the
>remaining gas ? Why can't you analyze for the FO2 in the remaining gas,
>calculate the O2% remained, pump in additional O2 (if needed), top off with
>air ?

Sid.Dive@Ib*.Ne*
Toronto, Canada

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