Product features: Has signal output indication. Dual signal output (analog output and TTL level output) TTL outputs a valid signal at a low level. (When the signal light is on when the output is low, it can be directly connected to the microcontroller) The analog output voltage is 0-5V, and the higher the concentration, the higher the voltage. It has high sensitivity and good selectivity towards carbon monoxide. Has long-term service life and reliable stability The gas sensing material used in the MQ137 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When ammonia is present in the environment where the sensor is located, the conductivity of the sensor increases with the increase of ammonia concentration in the air. A simple circuit can convert the change in conductivity into an output signal corresponding to the gas concentration. The MQ137 gas sensor has high sensitivity to ammonia gas and is also ideal for monitoring other organic amines such as trimethylamine and ethanolamine. This sensor can detect various ammonia containing gases and is a low-cost sensor suitable for various applications.
