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The MQ-3 Alcohol Sensor Module is a high-sensitivity gas sensor designed specifically to detect alcohol (ethanol) vapour in the air. It is widely used in breathalyzer systems, alcohol detection devices, and embedded electronics projects. The sensor offers fast response, stable performance, and long operational life, making it suitable for both educational and practical applications.

Key Features:

• High sensitivity to alcohol vapour
• Low sensitivity to other gases like benzine
• Fast response and recovery time
• Stable output and long service life
• Simple drive and interface circuit

Technical Specifications:

• Target Gas: Alcohol (Ethanol)
• Detection Range: 0.05 mg/L – 10 mg/L (Alcohol)
• Operating Voltage: 5 V DC / AC
• Heater Voltage: 5 V DC / AC
• Load Resistance: 100 kΩ – 470 kΩ (Recommended: ~200 kΩ)
• Heater Resistance: 33 Ω ±5%
• Power Consumption: Less than 750 mW
• Operating Temperature: −10 °C to 50 °C
• Humidity Range: Less than 95% RH
• Preheat Time: Minimum 24 hours for accurate readings

Applications:

• Breathalyzer and alcohol detection systems
• Arduino and microcontroller projects
• DIY electronics and robotics projects
• Safety and monitoring devices

Package Includes:

• 1 × MQ-3 Alcohol Gas Sensor