MQ-3 Gas Sensor(ethanol)

SKU: RB-02S016

Brand: ALSRobot

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This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC.
2014 latest MQ - X series gas sensor is designed to meet the demand of enviromental protection, it  MQ - 3 gas sensor,with high sensitivity to ethanol, can resist the interference of gasoline, smog, vapor, detect ethanol in the air sensitively.the material of MQ - 3 gas sensor is SnO2 ,which has low conductivity in clean air. With a 3p line connecting  sensor shield(Arduino-Compatible) , through  mega168 controller programming(Arduino-Compatible), it an be made ethanol alarm, alcohol tester with buzzer module and relay module.
Uses: used in detecting if someone is drunk or other ethanodetection.


  • detection range: 10-100ppm ethanol
  • characteristic gas: 125ppm ethanol
  • heating voltage: 5 + - 0.2 V (AC·DC)
  • loop voltage:24V DC
  • load resistance: adjustable
  • voltage in clean air: 1.5 V
  • service life: 5 years
  • Uses the MQ-3 C2H5OH Gas Sensor
  • Easy SIP interface
  • Compatible with most microcontrollers
  • Power requirements: 5 VDC @ 250 mA (Heater On) / 60 mA (Heater Off)
  • nterface: 1 TTL compatible input (HSW), 1 TTL compatible output (ALR)
  • Dimensions: 1.5 x 1.0 x 1.0 in(38.1 x 25.4 x 25.4 mm)
  • Operating temp range: 14°F to 122°F (10°C to 50°C)
  • size: 20.5 mm x 41mm
  • weight: 6g

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