The MQ-137 is an Ammonia (NH₃) petrol sensor from Winsen. The sensing element is SnO2, which has lower conductivity in clean air.
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The MQ-137 is an Ammonia (NH₃) petrol sensor from Winsen. The sensing element is SnO2, which has lower conductivity in clean air. When NH₃ (Ammonia) petrol exists, the sensor’s conductivity gets higher along with the petrol concentration rising. A simple circuit makes measuring this change in conductivity and turning it into data fairly straight-forward, but does require some calibration.
For easy Solderability; use our Petrol Sensor Breakout Board.
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