The gas-sensitive material used is tin oxide (SnO2) with a low conductivity in clean air. When gas sensor in the presence of combustible gases in the environment, the conductivity of the sensor increases as the concentration of combustible gases in the air increases. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. The MQ-6B gas sensor detects a wide range of flammable gases, especially for liquefied petroleum gas (propane), and is a low-cost sensor for a wide range of applications.
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