MQ-3 Alcohol Gas Sensor

The MQ-3 Alcohol Gas Sensor is specifically designed for the detection of alcohol vapor concentration in the air. It utilizes a tin dioxide (SnO2) semiconductor material as its sensitive layer. When alcohol vapor is present, it gets absorbed onto the sensor's surface, causing a decrease in the sensor's electrical resistance. The change in resistance is then translated into an analog voltage output, which is proportional to the concentration of alcohol vapor. This sensor is particularly useful in applications where monitoring alcohol levels is important, such as breathalyzers and industrial safety monitoring in environments where alcohol solvents might be present.

Features:

• High Sensitivity to Alcohol

• Fast Response and Recovery

• Good Selectivity to Alcohol

• Stable and Long Lifespan

• Low Cost

• Simple Drive Circuit 

Specifications:

Target Gas: Alcohol Vapor (Ethanol)

Detection Concentration Range: 0.05 mg/L - 10 mg/L

Operating Voltage: 5V ± 0.1V DC

Heater Voltage: 5V ± 0.1V AC/DC

Load Resistance: 200KΩ

Heater Resistance: 33Ω ± 5% (Room Temperature)

Heater Consumption: ≤ 750 mW

Preheat Time: Over 24 hours

Operating Temperature: -10°C - 50°C

Storing Temperature: -10°C - 50°C

Operating Humidity: < 95% RH

Standard Condition: Temperature: 20°C ± 2°C; Humidity: 65% ± 5% RH

Application:

Breathalyzers

Automotive Safety Systems

Industrial Safety Monitoring

Home Brewing and Wine Production

Hospitality Industry

Portable Alcohol Detectors

Educational and Hobbyist Projects