• smoke sensor
  • lpg
  • smoke

MQ-2 Smoke Sensor

  • • Target Gas: Smoke/ Combustible Gas
  • • Detection Range: 300~10000ppm(flammable gas)
  • • Application: domestic gas leakage alarm, portable gas detector

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Principle Introduction:
Winsen Electronics, manufacture original and new smoke gas sensor, propane gas sensor with long lifespan and low price, for domestic gas leakage alarm and flammable gas alarm use.
Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target flammable gas exist, 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.
MQ-2 gas sensor has high sensitivity to propane and smoke, also can detect the natural gas and other flammable steam well. It is with low cost and suitable for different applications of detecting kinds of flammable gases.
Applications :
It is widely used in domestic gas leakage alarm, industrial flammable gas alarm and portable gas detector.
Technical parameters :
Model MQ-2
Sensor Type Semiconductor
Standard Encapsulation Bakelite, Metal cap
Target Gas Flammable gas, smoke gas sensor
Detection range 300~10000ppm(flammable gas)
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 ≤950mW
Sensitivity S Ro(in air)/Rs(2000ppm C3H8)≥5
Output Voltage Vs 2.5V~4.0V(in 2000ppmC3H8)
Concentration Slope α ≤0.6(R3000ppm/R1000ppm C3H8)
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

NOTE: Output voltage(Vs) is VRL in test environment.
Reference Circuit :
 

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