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Grove - Gas Sensor MQ9
- Brands Seeedstudio Code: GRV-MQ9
The Grove - Gas Sensor module is useful for gas leakage detecting(in home and industry). It can detect Carbon Monoxide, Coal Gas, Liquefied Gas and so on. Measurements can be taken as soon as possible based on its fast response time. Also, the sensitivity can be adjusted by the potentiometer.
Note: The sensor value only reflects the approximated trend of gas concentration in a permissible error range, it DOES NOT represent the exact gas concentration. The detection of certain components in the air usually requires a more precise and costly instrument, which cannot be done with a single gas sensor. If your project is aimed at obtaining the gas concentration at a very precise level, then we do not recommend this gas sensor.
The sensitive material of the MQ-9 gas sensor is SnO2, which has lower conductivity in clean air. It makes detection by cycling high and low temperature and detects CO when low temperature (heated by 1.5V). The sensor’s conductivity is higher along with the gas concentration rising. When the temperature high (heated by 5.0V), it detects Methane, Propane, etc combustible gas and cleans the other gases adsorbed under low temperature.
Note: The output voltage from the Gas sensor increases when the concentration of gas increases. Sensitivity can be adjusted by varying the potentiometer. Please note that the best preheat time for the sensor is above 24 hours