• VOC Gas Sensor

MQ135 Semiconductor Sensor for Air Quality

  • • Detection Gas: ammonia, sulfide, benzene series steam
  • • Detection Range: 10~1000ppm( ammonia gas, toluene, Hydrogen, smoke)
  • • Application: IAQ Monitor, Domestic gas alarm

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Principle Introduction:
Winsen Electronics manufacture air quality sensor and VOC sensor MQ135 for IAQ monitor application.
Sensitive material of MQ135 gas sensor is SnO2, which with lower conductivity in clean air. When target pollution 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.
MQ135 gas sensor has high sensitivity to ammonia gas, sulfide, benzene series steam, also can monitor smoke and other toxic gases well. It can detect kinds of toxic gases and is a kind of low-cost sensor for kinds of applications.
Applications :
It is widely used in domestic gas alarm, industrial gas alarm and portable gas detector. 
Technical parameters :
Model MQ135
Sensor Type Semiconductor
Standard Encapsulation Bakelite, Metal cap
Target Gas ammonia, sulfide, benzene series steam
Detection range 10~1000ppm( ammonia gas, toluene, Hydrogen, smoke)
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 Rs(in air)/Rs(in 400ppm H2)≥5
Output Voltage Vs 2.0V~4.0V(in 400ppm H2)
Concentration Slope α ≤0.6(R400ppm/R100ppm H2)
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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