Semiconductor NH3 Sensor MQ137


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  • MQ-4-2.png

Summary:

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. 

Feature:

It has good sensitivity to NH3 gas in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.

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APPLICATION

Other Detector

Formaldehyde detector is an instrument for detecting formaldehyde. Generally, semiconductor sensors and electrochemical sensors are used to realize the rapid semi-quantification of formaldehyde in indoor air on the spot, which is characterized by simple structure, small size, intuitive,easy to carry and use.

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PARAMETER

Specification Product Size

Technical Data Sheet

Model No. 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 5.0V±0.1V  DC
Heater Voltage VH 5.0V±0.1V AC or DC
Load Resistance RL Adjustable
Sensor character under standard test conditions Heater Resistance RH 30Ω±3Ω(room temp.)
Heater consumption PH ≤950mW
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 Over 48 hours

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