About the Product
MQ-9 Flammable Gas Sensor Module – High-Sensitivity CO & Combustible Gas Detection
The MQ-9 flammable gas sensor module is designed for accurate and reliable detection of carbon monoxide (CO), methane (CH₄), and liquefied petroleum gas (LPG) in industrial safety systems. Operating at DC 5V with a 150mA power consumption, it offers both TTL digital and analog outputs for easy integration with microcontrollers and embedded systems.

Featuring tin dioxide (SnO₂) as the sensing material, the MQ-9 utilizes a low-temperature cycling method for precise CO detection, while maintaining high sensitivity to various combustible gases. With a fast ~20-second warm-up time, stable performance, and cost-effective design, it is ideal for gas leak alarms, industrial monitoring, and automation applications.

Key Specifications:

  • Operating Voltage: DC 5V

  • Power Consumption: 150mA

  • Digital Output (DO): TTL logic (0.1V low / 5V high)

  • Analog Output (AO): 0.1–0.3V (relative to gas concentration)

  • Warm-up Time: ~20 seconds

  • Sensing Material: Tin Dioxide (SnO₂)

  • Dimensions: 32mm × 20mm × 22mm