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  1. #1
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    Calculate PPM alcohol with MQ-3 sensor ?

    Dear Members,

    Does anyone know on how to calculate PPM alcohol with MQ-3 sensor ?

    Thanks

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  2. #2
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    Re: Calculate PPM alcohol with MQ-3 sensor ?

    Datasheet says that individual adjustment (calibration) with alcohole vapour/air mixture is necessary.
    Resistance value of MQ-3 is difference to various kinds and various concentration gases. So, when using this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for 0.4mg/L (approximately 200ppm) of alcohol concentration in air and use value of Load resistance (RL) about 200 KΩ(100KΩ to 470 KΩ).



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