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.
Electrical performance: - Input voltage: DC5V - Power (current): 150mA - DO output: TTL digital 0 and 1 (0.1 and 5V) - AO Output: 0.1-0.3V (relatively clean), the highest concentration voltage is about 4V - Special note: When the sensor is powered, it needs to be warmed up about 20S, so the measured data becomes stable, the heat sensor is a normal phenomenon, because its inside is with an electric wire, if not, unnomal.
- Product Model：MQ-9 - Product Type：Semiconduct-gassensitive element - Gas Detected：Carbon monoxide，Combustible gas - Detectable Concentration：10-1000ppmCO, 100-10000PPM gas