MQ3 Gas Sensor

The MQ3 Gas Sensor Module is a high-sensitivity gas sensor designed specifically for detecting alcohol vapors in the air. It is commonly used in breath analyzers, alcohol detectors, and other systems where alcohol concentration monitoring is required. The sensor is based on SnO₂ (tin dioxide), which changes its conductivity when exposed to alcohol gas. The MQ3 sensor provides analog and digital outputs, making it easy to interface with microcontrollers like Arduino, Raspberry Pi, ESP32, and others. With adjustable sensitivity, fast response, and stable operation, the MQ3 is an excellent choice for both DIY electronics projects and professional safety applications.

Key Features:

• Detects alcohol vapors with high sensitivity

• Fast response and recovery time

• Analog and digital output support

• Adjustable sensitivity via onboard potentiometer (in module form)

• Compatible with Arduino, Raspberry Pi, ESP8266, ESP32

• Long lifespan and stable performance

• Easy to integrate and use

• Compact, lightweight design

Specifications:

• Model: MQ3 Gas Sensor

• Gas Detected: Alcohol, ethanol vapors

• Operating Voltage: 5V DC

• Detection Range: 25 – 500 ppm (alcohol concentration)

• Load Resistance: 200 kΩ

• Heater Resistance: 33Ω ±5%

• Sensitivity: High to alcohol, low to smoke and other gases

• Response Time: < 10 seconds

• Preheat Time: 20 seconds

• Operating Temperature: -10°C to +50°C

• Output Type: Analog & Digital

• Dimensions: Approx. 32mm x 22mm x 27mm (module form)