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Calculate PPM alcohol with MQ-3 sensor ?

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bianchi77

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Dear Members,

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

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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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