Product description
Measures the level of ammonia gas in air. Measurement range: 5 to 500 ppm. The MQ-137 is a gas sensor for ammonia (NH?). The sensing element is a SnO2, which has lower conductivity in clean air. When NH? (ammonia) is detected in the air, the conductivity of the sensor increases as the gas concentration rises. The circuit makes it quite easy to convert the change in conductivity into data. Operating voltage: 5 VDC.
