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>Posted on 1 Mar 1996 at 07:46:48 by Barrie Kovish
>
>I checked the documentation on my teledyne sensor.  It had the following
>to say:
>
>1.  The teledyne sensor is not affected by humidity.  However the
>    ambient PO2 is reduced.  Free water condensing on the sensor
>    is however a problem.
>
I'm becoming increasingly fascinated by rebreathers.
First, I discuss this from a purely theoretical point of view.

Your application is semiclosed I understand.  Seems to me
that if the sensor is downstream of the point where sufficiently
gas is added (enough to bring the dewpoint below sensor ambient)
condensation might not be a problem.

The other thing one could do is to heat the sensor to a
certain number of Kelvins above ambient and calibrate it
there but I wonder how stable it's reading will be
as a function of the breathing rate (flowrate through
the sensor)

>
>2. The teledyne sensor contains a thermistor for temperature compensation.
>   However the document implied that the time for this device to
>   equilabrate is hours making it kind of useless for the types of
>   diving that I do.
>
But it could so be that within 5 minutes the sensor/thermistor
has covered 90% of the necessary change to reach equilibrium.
That's not so bad except maybe in water with huge thermoclines ?


John
cc015012@br*.br*.ed*

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