1.Sensitive material MQ-9 gas sensor is used to clean the air in the
lower conductivity of tin dioxide (SnO2). Detection method using low
temperature cycling (1.5V heating) to detect carbon monoxide,
conductivity sensors with carbon monoxide in the air increased with
increasing gas concentration, stray adsorbed at high temperatures
(5.0V heating) detection of combustible gases methane, propane
and cryogenic cleaning gases. Simple circuit can be used to change
the conductivity, concentration of the gas is converted to the
corresponding output signal. MQ-9 high gas sensor for carbon
monoxide, methane, liquefied petroleum gas sensitivity, the sensor
can detect a variety of gases containing carbon monoxide and
flammable, is a low-cost sensors for a variety of applications.