Gas Sensor MQ-137 Sensitive 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 concentration.
MQ137 gas sensor has high sensitity to Ammonia, also to other organic amine. The sensor could be used to detect different gas which contains Ammonia, it is with low cost and suitable for different application, sensor can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc using an Analog to Digital Converter (ADC).

Features

• Stable and Long Life
• High sensitivity to Ammonia
• Small sensitivity to SnO2
• Simple drive circuit
• Analog and Digital Outputs
• Trigger Level configuration Potentiometer

Specifications

• Load Resistance : 2KΩ
• Heater Resistance : 31Ω ±5% at Room Temperature
• Heating Consumption : < 900mW
• Operating Temperature : -10°C ~ 50°C
• Detection Range : 5 ~ 500 ppm of Ammonia
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• Operating Voltage: DC 5V
• Analog Output (AO): 0~5V analog output voltage
• Digital Outout (DO): 0V or 5V output
• Configuration: Through Potentiometer (adjusts the output level transition)
• Preheat Duration: 20s
• Weight: 5g
• Dimensions: 23 x 19 x 19 mm