MQ-9 Carbon Monoxide, Methane and LPG Gas Sensor Module can be use to sense Carbon Monoxide and Metahane Gas. Sensitive material of MQ-9 gas sensor is SnO2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO when low temperature (heated by 1.5V). The sensor’s conductivity is more higher along with the gas concentration rising. When high temperature (heated by 5.0V), it detects Methane, Propane etc. combustible gas and cleans the other gases adsorbed under low temperature.

Wire connections :
VCC – positive pole (5V)
GND – negative pole
DO – TTL switch signal output
AO – analog signal output

Applications :
Domestic gas leakage detector
Industrial gas detector
Portable gas detector
Package Includes :
1 x MQ-9 Carbon Monoxide, Methane and LPG Gas Sensor Module.

Specifications and Features :
Good sensitivity to CO/Combustible gas
High sensitivity to Methane, Propane and CO
Long life and low cost
Simple drive circuit
Input voltage: DC 5±0.2V
Power: 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively clean), the highest concentration voltage is about 4V.
Dimensions: 32 x 20 x 22 mm (LxWxH)
Weight: 5 gm.
Package includes:
1xMQ9 Carbon Monoxide, Methane and LPG Gas Sensor Module