MQ-3 Alcohol Ethanol Detection Sensor Module

MQ3 ( 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 exists, the sensor’s conductivity is higher along with the gas concentration rising. MQ-3 gas sensor has a high sensitivity to Alcohol and has good resistance to disturb of gasoline, smoke, and vapor.

This sensor provides an analog resistive output based on alcohol concentration. When the alcohol gas exists, the sensor’s conductivity gets higher along with the gas concentration rising.

Specifications:

• 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)
• AO output: 0.1- 0.3 V (relative to pollution), the maximum concentration of a voltage is about 4V
• 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)