MQ136 데이터시트 PDF

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MQ136 Semiconductor Sensor for Sulfur Dioxide

Sensitive material of MQ136 gas sensor is SnO2, which with lower conductivity in clean air. When the

target SO2 gas exist, the sensor’s conductivity is more higher along with the gas concentration rising.

Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas

concentration.

MQ136 gas sensor has high sensitity to SO2, also could be used to detect other vapor which

contains Sulfur. It has low sensitivity to normal combustible gases, which is with low cost and suitable for

different application.

Character

* Good sensitivity to SO2

* Long life and low cost

* Simple drive circuit

Configuration

Application

* Domestic SO2 concentration detector

* Industrial SO2 leakage detector

* Portable SO2 detector

Technical Data

Basic test loop

Model No.

MQ136

Sensor Type

Semiconductor

Standard Encapsulation

Bakelite (Black Bakelite)

Detection Gas

SO2

Concentration

1-200ppm (SO2)

Circuit

Loop Voltage

Heater Voltage

Load

Resistance

Vc

VH

RL

≤24V DC

5.0V±0.2V ACorDC

Adjustable

Heater

Resistance

RH

31Ω±3Ω（Room Tem.）

Character

Heater

consumption

Sensing

Resistance

PH

Rs

≤900mW

2KΩ-20KΩ(in 50ppm SO2)

Sensitivity S Rs(in air)/Rs(50ppm SO2)≥3

Slope

α

≤0.6(R100ppm/R50ppm SO2)

Tem. Humidity

20℃±2℃；65%±5%RH

Condition Standard test circuit

Vc: 5.0V±0.1V；

VH: 5.0V±0.1V

Preheat time

Over 48 hours

Power of Sensitivity body(Ps): Ps=Vc2×Rs/(Rs+RL)2

Vc VRL

RL

VH

GND

The above is basic test circuit of the sensor.

The sensor need to be put 2 voltage,

heater voltage（VH）and test voltage（VC）.

VH used to supply certified working

temperature to the sensor, while VC used

to detect voltage (VRL) on load resistance

（RL）whom is in series with sensor. The

sensor has light polarity, Vc need DC

power. VC and VH could use same power

circuit with precondition to assure

performance of sensor. In order to make

the sensor with better performance,

suitable RL value is needed:

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