MQ-7 Gas Sensor Module For Carbon Monoxide Detector Module

MQ-7 Carbon Monoxide (CO) Gas Sensor Module

The MQ-7 Gas Sensor Module is a reliable and cost-effective sensor designed for detecting Carbon Monoxide (CO) gas in the surrounding environment. Utilizing a metal oxide semiconductor (MOS) sensing element, the module provides accurate monitoring of CO concentrations and is widely used in gas leakage alarms, air quality monitoring systems, industrial safety equipment, and portable gas detectors.

The sensor offers both analog and digital outputs, allowing easy integration with Arduino, ESP32, Raspberry Pi, and other microcontroller platforms. An onboard potentiometer enables users to adjust the detection threshold for digital output according to their application requirements.

Key Features

• Specialized for Carbon Monoxide (CO) gas detection.
• Detects CO concentrations from 10 ppm to 1000 ppm.
• Provides both Analog and Digital outputs.
• Adjustable sensitivity via onboard potentiometer.
• Fast response and recovery characteristics.
• Compatible with Arduino, ESP32, Raspberry Pi, and other development boards.
• Compact and easy-to-use module design.

Technical Specifications

• Model: MQ-7
• Target Gas: Carbon Monoxide (CO)
• Operating Voltage: 5V DC
• Detection Range: 10 – 1000 ppm
• Characteristic Gas: 100 ppm CO
• Return Time: ≤ 30 seconds
• Heating Resistance: 31Ω ± 3Ω
• Sensitivity: ≤ 3%
• Output Type: Analog and Digital
• Dimensions: 3.5 × 2.0 × 1.1 cm
• Weight: 5g

Standard Test Conditions

• Temperature: 20°C ± 2°C
• Humidity: 65% ± 5% RH
• Circuit Voltage (Vc): 5.0V ± 0.1V
• Heater Voltage (High): 5.0V ± 0.1V
• Heater Voltage (Low): 1.5V ± 0.1V

Working Principle

The MQ-7 sensor detects carbon monoxide through a heated semiconductor sensing material. When CO gas is present, the electrical conductivity of the sensing element changes according to the gas concentration. This change is converted into corresponding analog and digital signals, enabling real-time monitoring and detection of carbon monoxide levels.

Applications

• Carbon Monoxide Leak Detection
• Domestic Gas Safety Systems
• Industrial CO Monitoring
• Portable Gas Detection Devices
• Smart Home Safety Projects
• Air Quality Monitoring Systems
• Environmental Monitoring Applications

Important Note

Carbon Monoxide (CO) is a toxic and potentially life-threatening gas. The MQ-7 sensor is suitable for monitoring and educational applications but should not be used as the sole safety device in critical life-protection systems without proper calibration and certification.

Package Includes

• 1 × MQ-7 Carbon Monoxide Gas Sensor Module