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Air Quality Sensor for CO and/or particulates

Discussion in 'General Electronics' started by [email protected], Mar 7, 2005.

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  1. Guest sells a kit for air quality monitoring mfg by

    it uses a heated sensor of some kind, shown as a capacitance symbol on
    the schematic.

    anyone know the principle behind the sensor used in this kit?

    they claim (iirc iianm) that it will detect carbon monoxide as well as
    particulates, does this sound reasonable / likely?

    otherwise, any recommendations out there for a CO sensor able to pick
    up small CO leaks into an automobile passenger area?


  2. It appears to be a catalytic bead sensor.
    There's a heating element, that heats a thermistor or
    RTD to 400C. The thermistor is coated with tin oxide,
    which reacts with CO and HC. The reaction heats the
    bead, changing its resistance. The change in ohms is roughly
    proportional to the PPM concentration of the gas.

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