MQ-9 Carbon Monoxide Methane LPG Gas Sensor Module (CO CH₄ LPG Gas Detection Sensor)

The MQ-9 Carbon Monoxide Methane LPG Gas Sensor Module is a gas detection module designed to detect carbon monoxide (CO), methane (CH₄), and liquefied petroleum gas (LPG) in ambient air. Based on the MQ-9 gas sensor element, it features a built-in heater and signal conditioning circuit to provide both analog and digital outputs. An onboard potentiometer allows adjustment of the detection threshold, making the module suitable for gas leak detection, safety systems, industrial monitoring, and embedded environmental sensing applications.

Key Features -

• Based on the MQ-9 gas sensor element

• Detects carbon monoxide (CO) gas

• Detects methane (CH₄) gas

• Detects liquefied petroleum gas (LPG)

• Analog and digital output interfaces

• Adjustable detection sensitivity using onboard potentiometer

• Built-in heater for stable sensor operation

• Fast response to combustible and toxic gases

• Compatible with Arduino, ESP32, Raspberry Pi, STM32, and other microcontrollers

• Suitable for gas leakage detection and safety monitoring

Specifications -

• Product type - Gas Detection Sensor Module

• Main IC / Chipset - MQ-9

• Detectable gases - Carbon Monoxide (CO), Methane (CH₄), LPG

• Operating voltage - 5V DC (Typical)

• Output signals - Analog and Digital

• Sensitivity - Adjustable via onboard potentiometer

• Response time - Fast detection response

• Heater - Integrated onboard heater element

• Package / Mounting type - PCB Module with Header Pins

Applications -

• Carbon monoxide leak detection systems

• LPG gas leak alarms

• Methane gas monitoring

• Home and industrial safety systems

• Smart home automation projects

• Environmental air quality monitoring

• Arduino and embedded gas sensing projects

• Laboratory and educational electronics experiments