MQ137 Ammonia gas sensor
The gas sensing material used in the MQ137 ammonia gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. When there is ammonia gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of the ammonia gas concentration in the air. The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit.
The MQ137 ammonia gas sensor has high sensitivity to ammonia gas, and is also ideal for monitoring other organic amines (such as trimethylamine, ethanolamine, etc.). This sensor can detect a variety of ammonia-containing gases and is a low-cost sensor suitable for a variety of applications.
Sensor Features
High sensitivity to ammonia gas
Long life and low cost
A simple drive circuit can
main application
Home use ammonia gas alarm
Industrial ammonia leak alarm
Portable Gas Detector
Technical indicators
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Product number |
MQ137 Ammonia gas sensor |
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product type |
Semiconductor gas sensor |
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standard package |
bakelite, metal cover |
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detect gas |
Ammonia |
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Detection concentration |
5-500ppm ammonia gas |
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Standard Circuit Conditions |
loop voltage |
Vc |
≤24V DC |
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heating voltage |
VH |
5.0V±0.1V ACorDC |
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Load Resistance |
RL |
adjustable |
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Gas sensor characteristics under standard test conditions |
heating resistance |
RH |
29Ω±3Ω（room temperature） |
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Heating power consumption |
PH |
≤900mW |
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The output voltage |
△Vs |
≥0.5V(in 50ppm NH3) |
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Sensitivity |
S |
Rs(in air)/Rs(50ppmNH3)≥2 |
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Concentration slope |
α |
≤0.6(R200ppm/R50ppm NH3) |
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Standard Test Conditions |
temperature 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 |
Not less than 48 hours |
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oxygen content |
21% (not less than 18%, the oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using it under low oxygen concentration) |
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life |
5 years |
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Note: The output voltage (Vs) refers to the VRL in the test atmosphere
production workshop
patent certificate
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