MQ137 - Hanwei

MQ137 Semiconductor Sensor

MQ137 Semiconductor Sensor for Ammonia Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concent.

Features

oltage Load Resistance Vc VH RL ≤24V DC 5.0V±0.2V ACorDC Adjustable Heater Resistance RH 31Ω±3Ω（Room Tem.） Character Heater consumption Sensing Resistance PH Rs ≤900mW 2KΩ-15KΩ(in 50ppm NH3 ) Sensitivity S Rs(in air)/Rs(5000ppm CH4)≥5 Slope α ≤0.6(R100ppm/R50ppm NH3) Tem. Humidity 20℃±2℃；65%±5%RH Condition Standard test circuit Vc: 5.0V±0.1V； VH: 5.0V±0.1V Preheat time Over 48 hours Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2 Vc VRL RL VH GND The above is basic test circuit of the sensor. The sensor need to be put 2 voltage, heater voltage（VH）and test voltage（VC）. V.