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Date: Tue, 25 Jun 1996 10:19:16 -0700 (PDT)
From: "Peter N.R. Heseltine" <heseltin@hs*.us*.ed*>
To: Barrie Kovish <bmk@ds*.bc*.ca*>
cc: techdiver@terra.net
Subject: Only one (O2) Solenoid on the CCR500

Barrie,

I misspoke:

On Tue, 25 Jun 1996, Barrie Kovish wrote:

>  1.  Is there more than one solenoid in a single breather?
>  Yes there are two on the CCR500	WRONG
   one for the O2 tank 	RIGHT
   and one for the diluent 	WRONG - it's a volumetric demand valve
>
> They've probably done this to prevent ox tox on descent.  Is there demand
> addition and if there is which gas is added by the demand valve, oxygen
> or diluent.

> >> 2.  Why can it only fail open?
> >
> >No, it can only fail *closed*. The no current poistion is closed.
>
> There is an urban legend that these things can fail open.  However
> I do not have an incident report of this happening.

Murphy's Law may apply. But they say that it can only fail closed. At
least you could bail. You would know because the PO2 displays would rise.

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