MQ136 hydrogen sulfide sensor

The gas sensing material used in the MQ136 hydrogen sulfide gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. When there is hydrogen sulfide gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of the hydrogen sulfide 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.

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Sensor Features
The MQ136 hydrogen sulfide gas sensor has high sensitivity to hydrogen sulfide and is ideal for monitoring other sulfur-containing organic vapors, but has low sensitivity to common combustible gases, making it a low-cost sensor suitable for a variety of applications.

 

main application
Widely used in household hydrogen sulfide concentration alarms, industrial hydrogen sulfide leakage alarms and portable hydrogen sulfide detectors

 

Technical indicators

Product number

MQ136 hydrogen sulfide sensor

product type

Semiconductor gas sensor

standard package

bakelite, metal cover

detect gas

hydrogen sulfide

Detection concentration

1-200ppm (hydrogen sulfide)

Standard Circuit Conditions

loop voltage

Vc

≤24V  DC

heating voltage

VH

5.0V±0.1V ACorDC

Load Resistance

RL

adjustable

Gas sensor characteristics under standard test conditions

heating resistance

RH

29Ω±3Ω(room temperature)

Heating power consumption

PH

≤900mW

The output voltage

△Vs

≥0.5V(in 50ppm H2S)

Sensitivity

S

Rs(in air)/Rs(50ppm H2S)≥3

Concentration slope

α

≤0.6(R200ppm/R50ppmH2S)

Standard Test Conditions

temperature humidity

20℃±2℃;55%±5%RH

Standard Test Circuit

Vc:5.0V±0.1V;

  VH: 5.0V±0.1V

Preheat time

Not less than 48 hours

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)

life

5 years


Note: The output voltage (Vs) refers to the VRL in the test atmosphere

production workshop

 

patent certificate

You can contact us through the online message and online customer service on the right, or you can call our national service hotline: 086-0371-60932951.

 

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