MQ-6 Propane Gas Sensor Module

Overview

The MQ-6 Propane Gas Sensor Module is a cost-effective, high-sensitivity propane and LPG sensor ideal for gas leak detection, industrial safety, and smart home air quality monitoring. It produces an analog voltage proportional to gas concentration, making it simple to read with ADC-capable microcontrollers such as Arduino and single-board computers like Raspberry Pi (with an ADC).

Why choose the MQ-6 Propane Gas Sensor Module

• Specifically tuned for propane (C3H8) and LPG but also responds to butane, methane and alcohol vapors
• Wide detection range and fast response for rapid leak detection
• Easy to integrate into DIY, industrial, and embedded systems using its analog output

Key Features

• High sensitivity to propane, LPG and other combustible gases
• Detection range: 200 to 10,000 ppm
• Analog output (0-5V) proportional to gas concentration
• Fast response time: ≤10 seconds
• Operating voltage: 5V DC
• Simple 4-pin header for quick connection
• Durable sensor element with long service life

Specifications

• Gas detected: Propane (C3H8), LPG, butane, methane, alcohol vapors
• Detection range: 200 to 10,000 ppm
• Operating voltage: 5V DC
• Output: Analog 0-5V
• Response time: ≤10 seconds
• Preheat time: ≥24 hours for best performance
• Operating temperature: -20°C to +50°C
• Dimensions: approx. 32mm x 22mm x 27mm

Applications

• Residential and commercial gas leak detection (kitchens, garages)
• Smart home automation and air quality monitoring
• Industrial safety systems and workshop monitoring
• DIY electronics and environmental sensor projects

Integration and Wiring Tips

• Typical 4-pin header: VCC (5V), GND, DO (digital output, optional), AO (analog output)
• Use the AO pin to read gas concentration via an ADC input on Arduino or an external ADC for Raspberry Pi
• Allow the sensor to preheat for at least 24 hours on first use for stable readings
• Implement smoothing or calibration curves in software to convert analog voltage to approximate ppm values

Mounting, Calibration and Maintenance

• Mount the sensor where gas is likely to accumulate (low points for heavier gases like propane) but avoid direct drafts
• Perform periodic calibration using known gas concentrations or compare against a calibrated reference sensor for improved accuracy
• Avoid exposure to high humidity, solvents, and strong corrosive gases which can degrade sensor life
• Replace the module if readings become unstable despite calibration and proper warm-up

Compatible Platforms and Projects

• Arduino: direct AO to analog input (A0) for simple detection and alert systems
• Raspberry Pi: use an external ADC (MCP3008 or similar) to read the analog output
• ESP8266 / ESP32: connect AO to ADC input for IoT-enabled leak alerts
• Project ideas: kitchen LPG leak alarm, garage safety monitor, remote IoT gas alert, workshop ventilation control

Safety and Compliance

The MQ-6 Propane Gas Sensor Module is intended for detection and monitoring purposes in hobbyist and industrial projects. It is not a certified replacement for professional gas detection equipment. For life-safety critical installations, use certified detectors and follow local codes and regulations.

Note: Images are for illustration purposes only.