MQ136 Gas Sensor for Hydrogen Sulfide

  • • Detection Gas: Hydrogen Sulfide, H2S
  • • Detection Range: 1~200ppm H2S
  • • Application: H2S gas alarm

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  • Principle Introduction
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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