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I don't want to belabor a point so I'll just say that you cannot, today, 
measure the pO2 of inspired gas directly during a dive on open circuit, but 
with SCR and CCR you can- so why not? I say- absolutely required- for several 
reasons including the one about diving too deep and toxing or having your cmfv 
crap out. Having a relatively inexpensive simple device installed on your 
SCR or CCR that could save your life is absolutely worth the 
effort, and I would strongly argue that it is mandatory on all 
rebreathers. I rely on three sensors every time I dive my CCR. And, if you 
believe having sensors would only add another possible source of system 
failure, so why have it?- I say: it is still better to have one sensor 
until it fails than not have one at all. Rod 

On Wed, 20 Mar 1996, Peter Den Haan wrote:

> 
> 
> On Wed, 20 Mar 1996, rfarb wrote:
> 
> > 
> > On Wed, 20 Mar 1996, Peter Den Haan wrote:
> > 
> > > step up from open circuit compared to fully closed. A correctly designed 
> > > semi-closed system, so far not available yet, can be as safe as open 
> > > circuit and would not require electronics or an O2 sensor. However, the 
> > > 
> > 
> > I don't agree. It is quite possible to dive a semi-closed nitrox 
> > rebreather too deep and die because elevated pO2. A audible or visual alarm 
> 
> That is possible with any Nitrox Dive, nothing to do with SCR.
> 
> Pete
> 
> 

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