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Sensitive material of MQ137 gas sensor is SnO2, which with lower conductivity in clean air. When NH3 gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
MQ137 gas sensor has high sensitivity to NH3 gas, also can monitor organic amine such as trimethylamine, cholamine well. It can detect kinds of gases including ammonia and is a kind of low-cost sensor for kinds of applications.Application Areas:
It is widely used in domestic NH3 gas alarm, industrial NH3 gas leakage alarm, portable NH3 gas detector.Technical Details:
Model MQ137 Sensor Type Semiconductor Standard Encapsulation Bakelite, Metal cap Target Gas Ammonia Gas(NH3) Detection range 5～500ppm NH3 Standard Circuit Conditions Loop Voltage Vc ≤24V DC Heater Voltage VH 5.0V±0.1V AC or DC Load Resistance RL Adjustable Sensor character under standard test conditions Heater Resistance RH 29Ω±3Ω(room tem.) Heater consumption PH ≤900mW Sensitivity S Rs(in air)/Rs(50ppmNH3)≥2 Output Voltage △Vs ≥0.5V (in 50ppm NH3) Concentration Slope α ≤0.6(R200ppm/R50ppm NH3) Standard test conditions Tem. Humidity 20℃±2℃；55%±5%RH Standard test circuit Vc:5.0V±0.1V； VH: 5.0V±0.1V Preheat time > 48 hours