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Barrie, On Mon, 24 Jun 1996, Barrie Kovish wrote: > Peter wrote: > > >The solenoids that add gas can *only* fail in the closed position. > > 2 questions: > > 1. Is there more than one solenoid in a single breather? Yes there are two on the CCR500: one for the O2 tank and one for the diluent (air or the crazy gas of your choice ;-) > 2. Why can it only fail open? No, it can only fail *closed*. The no current poistion is closed. The reason is that you don't want it to fail open and merrily add O2 to the bag 'til you seize. True, you should be aware of the rising pPO2 from your display, but at 5L/min when your fixated on that lion-fish..? I'd rather it failed closed and I have to add O2 manually than fail open and I run out and/or have to bail the system when I could have used that O2. > On a slightly different subject we took 1 measurement of swimming VO2max > on our semiclosed circuit constant mass flow rebreather at 2 ata. Result > was 2 lpm. How did you calculate that? i.e., what was the EANx, the mass flow and the PO2 change? better diving through better physiology Peter H.
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