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 , spurious adsorption 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 .

Specifications:

• Suitable for home or factory gas leakage monitoring devices.
• Have better sensitivity to Carbon Monoxide, Methane and LPG Gas.
• High quality dual-panel design, with power indicator and TTL signal output instructions.
• DO switching signal (TTL) output and AO analog signal output.
• TTL output valid signal is low. (When the output low signal is on, it can be directly connected micro-controller or relay module.)
• Analog output voltage: the higher concentration, the higher voltage.
• Four screw holes, easy positioning.
• Long life and stability, quick response and resume.