MQ-3B Semiconductor Alcohol Sensor

For alcohol gas alarm and portable alcohol detector

Applications :

*domestic alcohol gas alarm
*industrial alcohol gas alarm
*portable alcohol detector

Product Advantages:
  • *High sensitivity
  • *long lifespan
  • *low cost and simple drive circuit
Product Description:

Sensitive material of MQ-3B gas sensor is SnO2, which with lower conductivity in clean air. When the target alcohol 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-3B gas sensor has high sensitivity to alcohol gas and can resistant to the interference of gasoline, smoke and vapour. It is with low cost and suitable for various applications of detecting alcohol at different concentration.

Technical Parameters:
Model MQ-3B
Sensor Type Semiconductor
Standard Encapsulation Plastic cap
Target Gas Alcohol gas
Detection range 25~500ppm alcohol
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 ≤900mW
Sensitivity S Ro(in air)/Rs(125ppm C2H5OH)≥5
Output Voltage Vs 2.5V~4.0V (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:5.0V±0.1V VH:5.0V±0.1V
Preheat time Over 48 hours
The Latest Manual

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