Paul Harris wrote:
> 
> I have had a post by Ken Sallot copied to me regarding using a digtal
voltmeter to measure  the output of an Oxygen cell. Some simple calculation was
then done on the o/p voltage given to convert it to an O2 concentration. All
this, of course, was done following the usual calibration procedures.
> 
> I have a couple of questions regarding this.
> 1) How linear is the o/p from these cells?
> 2) Has anyone done the calculations electronically, ie used an amplifier to
boost the o/p. eg the 11.7mv reading given in the example to 21( 20.9) mv
> for air. ( Other than in a proper O2 meter of course.)
> 
> Is it worth re-inventing this wheel? We pay approx 200UKP ($300) over here,
for the whole lot. But I already have a DVM, and I believe the cells are approx
40 UKP.
> rgds
> Paul
> --
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You might want to check with Mike Cochran (mcochran@ne*.co*).  I
understand that they have an O2 sensor that has the ability for you to
calibrate to a known source as well as provide you with PPo2 at depth. 

I may be wrong on some of this, but I think it is worth checking out.

Keep wet.
Ralph

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