DFRobot Gravity Analog CO/Combustible Gas Sensor (MQ9) For Arduino


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SKU: 1356231
  1. Model: DFRobot Gravity Analog CO/Combustible Gas Sensor (MQ9)
  2.  power supply needs: 5V
  3. Interface type: Analog
  4. Sensor Type: Semiconductor
  5. Concentration: 10-1000ppm CO


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Brand: DF Robot
Category: Gas and Dust Sensor

This is an Arduino CO/Combustible Gas sensor. It uses MQ-9 to detect Carbon Monoxide. The sensor can be used to detect different gases containing CO and combustible gases, it is low cost and suitable for a variety of applications. The core sensing material of the MQ-9 gas sensor is SnO2, which has lower conductivity in clean air. It makes detection by cycling high and low temperatures and detects CO when low temperature (heated by 1.5V). The sensor’s 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 adsorbed under low temperature.

The sensitivity can be adjusted by the potentiometer. The output is proportional to the density of a gas. You can use analog reading to read the data from this sensor.
  1. Domestic gas leakage detector
  2. Industrial gas detector
  3. Portable gas detector


  1. Good sensitivity to CO/Combustible gas
  2. High sensitivity to Methane, Propane and CO
  3. Long life and low cost
  4. Simple drive circuit
  5. Heater consumption: ≤350mW
  6. Sensing Resistance: 2KΩ-20KΩ(in 100ppm CO )
  7. Sensitivity: Rs(in air)/Rs(100ppm CO)≥5
  8. Concentration:10-1000ppm CO ,00-10000ppm combustible gas
  9. Good sensitivity to CO/Combustible gas
  10. Slope: α ≤0.6(R300ppm/R100ppm CO)
  11. Tem. Humidity: 20℃±2℃; 65%±5%RH
  12. High sensitivity to Methane, Propane and CO

Package Includes:

1 x DFRobot Gravity Analog CO/Combustible Gas Sensor (MQ9) For Arduino


SKU: 1356231 Category:
Power Supply(V)




Loop Voltage


Heater Resistance


Sensor Resistance

2KΩ-20KΩ(in 100ppm CO)

Sensor Type




Dimensions in mm (LxW)


Shipping Weight 0.005 kg
Shipping Dimensions 5 × 4 × 2 cm
6 Months Warranty

This item is covered with a supplier warranty of 6 months from the time of delivery against manufacturing defects only. This is a quality product from the original manufacturer. Only manufacturing defects are covered under this warranty. Replacement will be done against manufacturing defects.

What voids the warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: China