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From: ddrake01 <start insert> On Thu, 4 May 1995 giii01@In*.Co* wrote: > You probably already > know this, but if you buy the little conector > from radio shack and hook it to your multimeter, > you can calculate the %O2 based on the number > of millivolts the sensor outputs realtive to what > it does in air. Yes this works, but as with an O2 analyzer, you have to make sure you calibrate to air before analyzing any mix. When they're brand new, the sensors I use put out about 12.1 - 12.6 mV when exposed to 21% O2 at 1 ATA. After about 6 months to a year of heavy use, they drop to about 8-9 mV. This needs to be taken into account when you analyze your gas. Aloha, Rich <end insert> Okay, so if I have a sensor that might be going bad, I can hook it up to my voltmeter and check what voltage its at. If I want to check the voltage on a mix greater than air with strictly the voltmeter, is it a linear relation, a curve, a guess or what? How do you figure out X volts at 21% = Y volts per % O2 > 21 %. Is that different than the the MiniOX's algorithm? What is the algorithm the MiniOX uses? What is the threshold voltage where the sensor is not considered reliable and therefor useless? What is the little connector that I'd get at Radio S. that will allow for easy checking? IOW, tell me all about the sensor/calibration please. Pretty please with pretty fishes on top please? <start insert> Yes, this works but you need to consider the accuracy of your volt meter. Most inexpensive meters are are only rated to 3% or worse accuracy. Richard Chapski <end insert> Does anyone know how to easily and accurately check the accuracy? I don't have a lab at home, but can get access to a "board room" and friends at my plant if that is neccessary. Where is the cheapest place to pick up sensors, in the US for each company? Do you use the same sensor/miniox to check mixes less than 21% O2? t? Thanks for sharing your experience and information. DAVID DRAKE AHDNN1A.DDRAKE01@ED*.CO* ROMULUS, MICHIGAN EDS/GM POWERTRAIN 8-375-5467 (GM NET)
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