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

Applications:

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