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MQ-9 Carbon Monoxide and Combustible Gas Sensor Module

The MQ-9 Carbon Monoxide and Combustible Gas Sensor Detection Module is a reliable and versatile gas sensing device designed to detect carbon monoxide (CO) and various combustible gases in the air. This module is widely used in applications such as gas leakage detection, industrial safety, and environmental monitoring.


  • High Sensitivity: Equipped with a high-quality semiconductor gas sensor, the MQ-9 module can detect a wide range of gases with high sensitivity and accuracy.
  • Versatile Detection: The module can detect carbon monoxide (CO) gas as well as a range of combustible gases including methane (CH4), propane (C3H8), and butane (C4H10).
  • Digital Output: It provides a digital output signal indicating the presence of gas, making it easy to interface with microcontrollers and other digital systems.
  • Adjustable Sensitivity: The sensitivity of the module can be adjusted using an onboard potentiometer, allowing for fine-tuning according to specific application requirements.
  • Fast Response Time: The sensor responds quickly to changes in gas concentration, ensuring prompt detection and response to potential gas leaks or hazardous situations.
  • Stable Performance: With its reliable performance and long lifespan, the MQ-9 gas sensor module is suitable for both short-term and long-term monitoring applications.
  • Easy Integration: The module features a compact design with four pins for easy connection and integration into your projects.
  • Wide Operating Voltage: It operates at a voltage range of 5V to 12V, making it compatible with various power supply systems.


  • Operating Voltage: 5V to 12V
  • Target Gases: Carbon monoxide (CO), methane (CH4), propane (C3H8), butane (C4H10)
  • Detection Range: 10 to 1000 ppm (CO), 100 to 10000 ppm (combustible gases)
  • Interface: Digital output
  • Dimensions: 32mm x 20mm x 22mm
  • Weight: 5g


  • Gas leakage detection systems
  • Industrial safety and ventilation control
  • Air quality monitoring
  • Environmental monitoring
Weight 0.5 kg
Dimensions 3.2 × 2.0 × 2.2 cm


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