MQ-2 Smoke Sensor
The gas-sensing material used in the MQ-2 smoke sensor is tin dioxide (SnO2), which has a low conductivity in clean air. When there is flammable gas in the environment where the smoke sensor is located, the conductivity of the smoke sensor increases with the increase of the concentration of flammable gas in the air. The change in conductivity can be converted into an output signal corresponding to the gas concentration of this smoke sensor using a simple circuit.
The MQ-2 gas smoke sensor has high sensitivity to liquefied gas, propane, and hydrogen, and is also ideal for the detection of natural gas and other combustible vapors. This gas sensor can detect a variety of flammable gases and is a low-cost smoke sensor suitable for a variety of applications.
Sensor Features
MQ-2 smoke sensor has good sensitivity to combustible gas in a wide concentration range
High sensitivity to liquefied gas, propane, hydrogen
Long life and low cost
A simple drive circuit can
main application
Household Gas Leak Alarm
Industrial flammable smoke gas alarms
Portable Smoke and Gas Detectors
Technical indicators
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Product number |
MQ-2 Smoke Sensor |
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product type |
Semiconductor gas sensor |
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standard package |
bakelite, metal cover |
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detect gas |
flammable gas, smoke |
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Detection concentration |
300-10000ppm (combustible gas) |
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Standard Circuit Conditions |
loop voltage |
Vc |
≤24V DC |
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heating voltage |
VH |
5.0V±0.1V ACorDC |
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Load Resistance |
RL |
adjustable |
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Gas sensor characteristics under standard test conditions |
heating resistance |
RH |
29Ω±3Ω（room temperature） |
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Heating power consumption |
PH |
≤950mW |
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The output voltage |
Vs |
2.5V~-4.0V(in 2000ppm C3H8 ) |
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Sensitivity |
S |
Rs(in air)/Rs(2000ppm C3H8 )≥5 |
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Concentration slope |
α |
≤0.6(R3000ppm/R1000ppm C3H8) |
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Standard Test Conditions |
temperature humidity |
20℃±2℃；65%±5%RH |
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Standard Test Circuit |
Vc:5.0V±0.1V； VH: 5.0V±0.1V |
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Preheat time |
Not less than 48 hours |
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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) |
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life |
10 years |
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Note: The output voltage (Vs) refers to the VRL in the test atmosphere
production workshop
patent certificate
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