Sensitive material MQ-9 gas sensor is used to clean the air in the smaller of the conductivity of tin dioxide (SnO2). detection method using low temperature cycling (1.5 V heating) to detect carbon monoxide, conductivity sensors with increased with the concentration of carbon monoxide gas in the air, adsorption spurious at high temperatures (5.0 V heating) methane detection of combustible gases, propane and cryogenic gas cleaning. simple circuit can be used to change the conductivity, the gas signal concentration is converted to the corresponding output. MQ-9 high gas sensor for carbon monoxide, methane, the sensitivity of liquefied petroleum gas, the sensor can detect a variety of gases containing carbon monoxide and flammable,
Note - After the sensor is powered, need to warm about 20s.
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