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>Posted on 29 Oct 1996 at 08:12:36 by Paul Harris >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.) You have to read the spec. sheet (or measure should the spec. sheet not prove representative) to find the accuracy of the sensor in question and the calibration procedure necessary to achieve the stated accuracy. You can build a mV DC amplifier like the one you describe. Among the design parameters to consider are gain and offset adjust, independence of gain and offset, current consumption etc. Then the issue of stability (repeatability) with temperature, battery voltage and time. In fact I just offered a prototype w/ LCD readout and low battery alarm for sale here a bit over a week back but that one was somewhat custom made to a specific high-output sensor. John
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