MQ3 Alcohol Gas Sensor

MQ-3 module is suitable for detecting Alcohol, Benzine, CH₄, Hexane, LPG, CO. Sensitive material of MQ-3 gas sensor is SnO₂, which with lower conductivity in clean air. When the target alcohol gas exist, the sensor’s conductivity is more higher along with the gas concentration rising. MQ-3 gas sensor has high sensitity to Alcohol, and has good resistance to disturb of gasoline, smoke and vapor.

Technical Specification:

• Power requirements: 5 VDC @ ~165 mA (heater on) / ~60 mA (heater off)
• Current Consumption: 150mA
• DO output: TTL digital 0 and 1 ( 0.1 and 5V)
• Detecting Concentration: 0.05-10mg/L Alcohol
• Interface: 1 TTL compatible input (HSW), 1 TTL compatible output (ALR)
• Heater consumption: less than 750mW
• Operating temperature: 14 to 122 °F (-10 to 50°C)
• Load resistance: 200kΩ
• Sensitivity S: Rs(in air)/Rs(0.4mg/L Alcohol)≥5
• Sensing Resistance Rs: 2KΩ-20KΩ(in 0.4mg/l alcohol)
• Dimensions: 32mm*22mm*16 mm (L*W*H)

 Features:                                  

• High sensitivity to alcohol and small sensitivity to Benzine
• Fast response and High sensitivity
• Stable and long life
• Simple drive circuit

Applications:           

• Gas level over-limit alarm
• Breathalyser
• Portable alcohol detector
• Stand-alone/background sensing device
• Environmental monitoring equipment