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And if my last post wasn't enough, I forgot the most important part. The 
readings of the three CCR 155 O2 sensors are averaged and compared to the 
set point. If one sensor is more than a set % off from the other two, the 
abnormal one is tossed out and two are averaged. If is somewhat above the 
setpoint, nothing happens. If it is more than that, the primary display 
indicates the severity of the problem; the secondary gauge is used to 
determine direct sensor readings. If the average is below the set point, 
the seconadry gauge indicates this, the solenoid is activated to open and 
release 1/3 liter of O2 from an accumulator at 120 psi over ambient 
that is fed by the first stage regulator. When the appropriate amount of 
O2 is added to bring the unit up to the setpoint, the solenoid stops 
opening. Rod

On Tue, 26 Mar 1996, Alex Varouxis wrote:

> How many PO2 sensors are used in a rebreather and how are they read?
> 
> -Alex
> 
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