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MQ-9 Gas Sensor Module For Carbon Monoxide, Methane, and LPG Detector Module

MQ-9 Gas Sensor Module For Carbon Monoxide, Methane, and LPG Detector Module

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  • Good sensitivity to CO/Combustible Gas
  • DO switching signal (TTL) output and AO analog signal output.
  • High sensitivity to Methane, Propane, and CO
  • The module require minimum input voltage of 5±0.2 VDC .
  • Current Consumption: 150mA
  • For home or factory gas leak detection device, suitable for carbon monoxide, combustible gas monitoring device.

MQ-9 Gas Sensor Module

This is MQ-9 Carbon Monoxide, Methane, and LPG Gas Sensor Module can be used to sense Carbon Monoxide and Methane Gas. The sensitive material of the MQ-9 gas sensor is SnO2, which with lower conductivity in clean air.
It makes detection by the method of cycle high and low temperature, and detect CO when the low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. The MQ9 Gas Sensor Module conductivity is higher along with the gas concentration rising. When temperature rises (heated by 5.0V), it detects Methane, Propane, combustible gas, etc. and cleans the other gases as it absorbed under low temperature. MQ-9 usually applied in domestic gas leakage detector, industrial gas detector, portable gas detector, etc.
When the high temperature (heated by 5.0V), it detects Methane, Propane, etc. combustible gas and cleans the other gases adsorbed under low temperature.

Read our blog MQ sensor where we explained what is a gas sensor, what is 1ppm equal to, MQ sensor list of different series and their features.

MQ9 Gas Sensor Wire Connections:

  • VCC - Positive pole (5V)
  • GND - Negative pole
  • DO - TTL switch signal output
  • AO - Analog signal output


  • The domestic gas leakage detector
  • Industrial gas detector
  • Portable gas detector

      Package Includes:

      • 1 x MQ-9 Gas Sensor Module


      Model  MQ9 Gas Sensor
      Operating Voltage  5V (DC)
      Current Consumption 150 mA
      Do output TTL digital 0 and 1 (0.1 and 5V)
      Ao output 0.1-0.3V (relatively clean)
      Dimensions 3.2 x 2 x 1.6 cms
      Weight  5 grams

      Shipping & Returns

      • All orders confirmed before 3 pm IST are shipped on the
        same day, barring rare pickup delays on holidays or disturbances
      • Delivery time in Metro cities is 1-3 days, Others it is
        3-7 days. It varies based on location, reliant on courier services
      • Return window: 7 days from receipt unless stated
        otherwise. No refunds/replacements after
      • Returns only for non-working/damaged products are accepted
      • Initiate return requests to our customer service team via Support ticket or contact us at +91-8123057137
      • Refunds are processed within 3-4 working days post inspection and approval.

      For more details, please check our Shipping and Return Policy

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      1. What are gas sensors? How do they work?

      • Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration. 
        Gas sensor detects the presence or concentration of gases in the atmosphere. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor, which can be measured as output voltage. Based on this voltage value the type and concentration of the gas can be estimated.

      2. How to use MQ-5 Gas Sensor?

      • Power the module with 5V and you should notice the power LED on the module to glow and when no gas it detected the output LED will remain turned off meaning the digital output pin will be 0V. Remember that these sensors have to be kept on for pre-heating time before you can actually work with it. Now, introduce the sensor to the gas you want to detect and you should see the output LED to go high along with the digital pin, if not use the potentiometer until the output gets high. Now every time your sensor gets introduced to this gas at this particular concentration the digital pin will go high (5V) else will remain low (0V).