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> >(Steve Lindblom wrote >Incidently, the problem with the automotive types, is apparently that they >are designed to work with PO2's below 21% - since they made to measure >combustion efficiency, and there's no predicting how well they'll do at >nitrox PO2's. Plus they need to be hot - later ones have heater circuits >built in, but that takes a heck of a lot more than a 9V to run - and they >cost as much/more than a proper med O2 sensor. > Little more info on automotive oxygen sensors. Basically, they are not appropriate for breathing gas measurement. Spend the $100 and buy the miniox sensor. Read on if interested. They are designed to work at 0% oxygen. You get a voltage difference when you have O2 in the exhaust gas and no voltage when there is no oxygen. They are on/off sensors, not continuously variable. The engine computer varies the fuel flow so that the sensor is constantly switching on and off, that is how the computer knows the air fuel mix is right. There is another version of the sensor that we use in the laboratory that operates over a wider range, but it is only good for up to 20-30% O2 and is not linear anyway. This wide range sensor is also something over $1000 per sensor. Another point, they have to be at a temp of a few hundred degrees Fahrenheit to operate. Tim Taylor taylor@ru*.ne* Michigan Underwater Preserve Council web page and 1997 FSUPC Photo Contest winners http://www.rust.net/~taylor -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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