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>David B. Drake  wrote:
>
>     I'd pretty much figured that out, but wondered would it not be better
>     to continually flush the system as in a semi-closed system? I figure
>     you'd see a saw-toothed profile of the N2/He2 gradient, being the best
>     right after you purge the system.  Do most designs have the O2 rich
>     feed coming into the diver's mouth as directly as possible and the
>     burp/exhaust to ambient valve on the return from the diver (before the
>     O2 is added)? Too bad there isn't an easy way to separate/capture the
>     N2, but that's why we have lightning and fertilizer factories! --DD

I believe that some but not all fully closed O2 rebreathers use a constant
mass flow valve ( or something similar ) to automatically add O2 to the 
breathing loop.  You will then either vent or be required to flush the bag
at some point.


Barrie Kovish
Vancouver

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