Principle Introduction:
Winsen Electronics produce semiconductor hydrogen sulfide sensor, H2S Gas sensor MQ136 for H2S gas alarm.
Sensitive material of MQ136 gas sensor is SnO2, which with lower conductivity in clean air. When H2S 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.
MQ136 gas sensor has high sensitivity to H2S gas, also can monitor organic vapor including sulfur well. It a kind of low-cost sensor for kinds of applications.

Applications :
It is widely used in domestic H2S gas alarm, industrial H2S gas leakage alarm and portable H2S gas detector.

Technical parameters :

Tips:For more parameter information, please refer to the latest manual provided by salesman.

Model			MQ136
Sensor Type			Semiconductor
Standard Encapsulation			Bakelite, Metal cap
Target Gas			Hydrogen Sulfide(H2S gas)
Detection range			1～200ppm
Standard Circuit Conditions	Loop Voltage	Vc	≤24V DC
	Heater Voltage	VH	5.0V±0.1V AC or DC
	Load Resistance	RL	Adjustable
Sensor character under standard test conditions	Heater Resistance	RH	29Ω±3Ω（room tem.）
	Heater consumption	PH	≤900mW
	Sensitivity	S	Rs(in air)/Rs(50ppm H2S )≥3
	Output Voltage	△Vs	≥0.5V(in 50ppm H2S)
	Concentration Slope	α	≤0.6(R200ppm/R50ppm H2S )
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

Reference Circuit :

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