MQ-7 gas sensor is sensitive material used in clean air, low conductivity tin dioxide (SnO2). Detection method using low temperature cycling (1.5V heating ) detect carbon monoxide, airborne sensor conductivity increases with the increase of the concentration of carbon monoxide gas , high temperature (5.0V heating ) cleaning stray gas adsorption at low temperature . Using a simple circuit can be changes in the conductivity , concentration of the gas is converted to the corresponding output signal. MQ-7 gas sensor with high sensitivity for carbon monoxide , this sensor can detect a variety of gases containing carbon monoxide , is a low-cost sensors for a variety of applications.
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