MQ-9 Carbon Monoxide and Combustible Gas Sensor Module

MQ-9 Carbon Monoxide and Combustible Gas Sensor Module
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  • Product Code:SQ1101
  • Availability: 1000
  • $0.90
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  • Ex Tax:$0.90
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Tags: gas sensor, MQ-9, CO detector, combustible gas, Arduino module, safety sensor, LPG sensor

The MQ-9 is a semiconductor gas sensor module designed for detecting carbon monoxide (CO) and a range of combustible gases, including methane and LPG. Its sensing element is made of tin dioxide (SnO2), and it features a dual heating mode: low temperature (1.5V) for CO detection and high temperature (5.0V) for combustible gases. The module provides both an analog output (AO) for continuous measurement and a digital output (DO) with a TTL signal for threshold-based detection, adjustable via an onboard potentiometer.
Carbon monoxide sensor operates on a 5V DC supply and is commonly used in gas leakage alarms, fire detection systems, and air quality monitoring. With its simple interface and compatibility with microcontrollers such as Arduino, the MQ-9 module offers a practical solution for carbon monoxide and combustible gas sensing in household and industrial applications.

Carbon monoxide sensor Application

  1. Household gas leakage alarms
  2. Industrial carbon monoxide detection
  3. Fire and smoke detection systems
  4. Portable gas detectors
  5. Air quality and pollution monitoring
  6. Arduino and microcontroller-based sensing projects

Carbon monoxide sensor Specifications

  1. Operating Voltage: 5V DC
  2. Operating Current: 150mA (some sources indicate 180mA)
  3. Sensing Material: SnO2 (tin dioxide)
  4. Detection Range (CO): 10–1000 ppm
  5. Detection Range (Combustible Gas): 100–10000 ppm
  6. Analog Output (AO): 0.1–0.3V (clean air, typical); up to 4V at high concentration
  7. Digital Output (DO): TTL level (0V or 5V)
  8. Heating Resistance: 31Ω ± 3Ω
  9. Heating Consumption: ≤ 350mW
  10. Dimensions: 32 × 20 × 22 mm (L × W × H)
  11. Pin Count: 4 (GND, VCC, DO, AO)
  12. Operating Temperature: Not specified in the source
Electrical Parameters
Voltage DC 5V
Current 150mA
Physical Parameters
Size 32mm x 20mm x 22mm

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