MQ137 Semiconductor Gas Sensor For Domestic NH₃ Gas Alarms

Working Principle:

The sensitive material SnO₂ of the MQ137 gas sensor has lower conductivity in clean air. When ammonia gas is present, the sensor's conductivity increases with the rise of gas concentration. Users can convert the change of conductivity into a corresponding output signal of gas concentration through a simple circuit.

Applications:

• Domestic NH₃ gas alarms
• Industrial NH₃ gas leakage alarms
• Portable NH₃ gas detectors

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