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> If the average is pooled is that a true representation of what you are
> breathing?

I dunno.  What matters to me is how close the three sensors are to each
other.  If they are very close, then I can trust the average. If they are
not, then I cannot trust the average.  Also, it depends on whether the gas
is well-mixed, and where in the loop relative to your lungs the sensors
are getting their readings.  You also need to remember what level of
precision has any physiological significance.  Having sensors read to
within 0.01 atm is nice to gauge their reliability, accuracy, and
consistency;  however, the "physiology noise" probably renders precision
any greater than about +/- 0.2 atm physiologically meaningless. 

> What type of sensors are used? Are they the Mini Ox and Teledyne styles?

That varies from rebreather to rebreather.  In all the cases I am aware 
of, the sensors are NOT the same as those used by the hand-held O2 
analyzers, but are based on the same principle of operation.

Again, I hope this answers your questions.

Aloha,
Rich

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