MQ3 Alcohol Sensor Module

Description

MQ-3 module is suitable for detecting Alcohol, Benzene, 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 higher along with the gas concentration rising. MQ-3 gas sensor has 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 exist, the sensor’s conductivity gets higher along with the gas concentration rising.

There is a resistance across an A and B inside the sensor which varies on detection of alcohol. More the alcohol, the lower will be the resistance. The alcohol is measured by measuring this resistance. The sensor and load resistor form a voltage divider, and the lower the sensor resistance, the higher the voltage reading will be.

Features of MQ-3 Alcohol Sensor:
•    Sensor Type – Semiconductor
•    Easy SIP header interface
•    Compatible with most of the microcontrollers
•    Low-power standby mode
•    Requires heater voltage
•    Good sensitivity to alcohol gas
•    Fast response and High sensitivity
•    Long life and low cost
•    Requires simple Drive circuit