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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)
