MQ137 Ammonia NH3 Gas Sensor
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memory Technical Parameters & Datasheet Summary
SKU: ANIL2017MQ137 Ammonia NH3 Gas Sensor is use for NH3 gas alarm, industrial NH3 gas leakage alarm, portable NH3 gas detector.
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.
Features
- You can use it as both digital sensors and analog sensors.
- This sensor operates in an analog voltage range of 0V to 5V. In the case of digital voltages, the output voltage is either 0 or 5V.
- It has high sensitivity to ammonia and organic amines.
- It provides a stable operation along with fast response.
- You can change the digital pin sensitivity by connecting a potentiometer and varying its resistance.
- It provides a feature of preheating duration over 24 hours.
Specifications:
|
Model |
MQ137 |
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Sensor Type |
Semiconductor |
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Standard Encapsulation |
Bakelite, Metal cap |
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Target Gas |
Ammonia Gas(NH3) |
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Detection range |
5～500ppm NH3 |
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Standard Circuit Conditions |
Loop Voltage |
Vc |
≤24V DC |
|
Heater Voltage |
VH |
5.0V±0.1V AC or DC |
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Load Resistance |
RL |
Adjustable |
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Sensor character under standard test conditions |
Heater Resistance |
RH |
29Ω±3Ω(room tem.) |
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Heater consumption |
PH |
≤900mW |
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Sensitivity |
S |
Rs(in air)/Rs(50ppmNH3)≥2 |
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Output Voltage |
△Vs |
≥0.5V (in 50ppm NH3) |
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Concentration Slope |
α |
≤0.6(R200ppm/R50ppm NH3) |
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Standard test conditions |
Tem. Humidity |
20℃±2℃；55%±5%RH |
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Standard test circuit |
Vc:5.0V±0.1V； VH: 5.0V±0.1V |
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Preheat time |
Over 48 hours |
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