Sensitive material MQ-7 gas sensors used in clean air, low conductivity tin oxide (SnO2). High-low temperature cycling detection mode (1.5V heating) carbon monoxide detector, conductivity sensor with the increasing concentration of carbon monoxide gas in the air increases,high-temperature (5.0V heating) cleaning cryoadsorption stray gases. Using a simple circuit to change the conductivity, concentration of the gas is converted to the corresponding output signal. MQ-7 gas sensor of high sensitivity for carbon monoxide, this sensor can detect a variety of gases containing carbon monoxide, is a low-cost sensors for a variety of applications


Can be used for home and factory gas leakage monitoring devices, suitable for liquefied petroleum gas, butane, propane, methane, smoke, etc.


  • Product model: MQ-7
  • Product type : Semiconductor gas sensor
  • Detection gas: carbon monoxide
  • Detection concentration: 10-1000ppmCO
  • Loop voltage: le10V DC
  • Heating voltage (VH): 5.0V plusmn 0.2V ACorDC (high)
  • 1.5V plusmn 0.1VACorDC (low)
  • Heating time (TL): 60plusmn1S (high) 90plusmn1S (low)
  • Load resistance (RL): adjustable
  • Heating resistance (RH): 31Omega plusmn 3Omega (room temperature)
  • Heating power consumption (PH): le350mW
  • Sensitive surface resistance (Rs): 2KOmega-20KOmega (in100ppmCO)
  • Sensitivity (S); Rs (in air) / Rs (100ppmCO) ge 5
  • Concentration slope (alpha): le 0.6 (R300ppm/R100ppmCO)
  • Temperature, humidity: 20 deg C plusmn 2 deg C; 65% plusmn 5% RH
  • Standard test circuit: Vc: 5.0V plusmn 0.1V; VH (high): 5.0V plusmn 0.1V; VH (low): 1.5V plusmn 0.1V


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