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Semiconductor NH3 Sensor MQ137

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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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	V_C	5.0V±0.1V DC
	Heater Voltage	V_H	5.0V±0.1V AC or DC
	Load Resistance	R_L	Adjustable
Sensor character under standard test conditions	Heater Resistance	R_H	30Ω±3Ω（room temp.）
	Heater consumption	P_H	≤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		V_C:5.0V±0.1V； V_H: 5.0V±0.1V
	Preheat time		Over 48 hours

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