MQ303B Semiconductor Alcohol Sensor

For portable alcohol gas detector

Applications :

*portable alcohol gas detector

Product Advantages:
  • *High sensitivity
  • *quick response and resume
  • *long lifespan
  • *low power consumption
Product Description:

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.

Technical Parameters:
Model MQ303B
Sensor Type Semiconductor
Standard Encapsulation Metal
Target Gas Alcohol gas
Detection range 20~ 500ppm alcohol
Standard Circuit Conditions Loop Voltage VH 0.9V±0.1V AC or DC
Heater Voltage Vc ≤6V DC
Load Resistance RL Adjustable
Heater Resistance RH 4.0Ω±0.5Ω(room temp.)
Heater consumption PH ≤140mW
Sensor character under standard test conditions Zero point V0 0.01~0.45V
Sensitivity VS 1.0~2.5V (in 125ppm C2H5OH)
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 Not less than 48 hours
The Latest Manual

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