MQ303B Semiconductor Alcohol Sensor

  • • Detection Gas: Alcohol, C2H5OH
  • • Detection Range: 20~ 500ppm alcohol
  • • Application: gift-type breathalyzer, alcohol tester

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  • Principle Introduction
Principle Introduction:
Winsen Electronics manufacture mini size alcohol sensors for gift-type breathalyzer use.
Sensitive material of MQ303B gas sensor is semiconductor material which is with lower conductivity in clean air. When the target alcohol 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.
Applications :
It has high sensitivity to alcohol and quick response and resume, widely used in portable alcohol gas detector.
Technical parameters :

Tips:For more parameter information, please refer to the latest manual provided by salesman.

Model MQ303B
Sensor Type Semiconductor
Standard Encapsulation Metal
Target Gas Alcohol gas
Detection range 20~ 500ppm alcohol
Standard Circuit Conditions Loop Voltage V H 0.9V±0.1V AC or DC
Heater Voltage V c ≤6V DC
Load Resistance R L Adjustable
Heater Resistance RH 4.0Ω±0.5Ω(room temp.)
Heater consumption PH ≤140mW
Sensor character under standard test conditions resistance of sensitive material R0 1KΩ~400KΩ(in air)
Sensitivity S R0(in air)/Rs(in 125ppm C2H5OH)≥3
Concentration Slope α ≤0.6(R300ppm/R50ppm C2H5OH)
Standard test conditions Tem. Humidity 20℃±2℃ 55%±5%RH
Standard test circuit Vc:3.0V±0.1V DC VH: 0.9V±0.1V DC
Preheat time Over 48 hours
Reference Circuit :

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