MQ9 Carbon Monoxide, Methane and LPG Gas Sensor Module For Arduino/Raspberry Pi

MQ-9 sensor introduction: The gas sensitive material used by the MQ- 9 gas sensor is two tin oxide (SnO2) with low conductivity in clean air. Carbon monoxide was detected at low temperature (1.5V heating) by high and low temperature cycle detection. The conductivity of the sensor increased with increasing concentration of carbon monoxide in the air. High temperature (5.0V heating) was used to detect combustible gas methane and propane and to clean the stray gas adsorbed at low temperature. The change of electrical conductivity can be converted into an output signal corresponding to the concentration of the gas by using a simple circuit. MQ-9 gas sensor has high sensitivity to carbon monoxide, methane and liquefied petroleum gas. The sensor can detect various gases containing carbon monoxide and flammable gas, and is a low-cost sensor suitable for many applications. Features: Suitable for home or factory gas leakage monitoring devices , monitoring devices suitable for carbon monoxide and other combustible gases , carbon monoxide can be tested 10 to 1000ppm CO, combustible gas range 100 to 10000ppm Module Features : 1 , using high-quality dual-panel design, with power indicator and TTL signal output instructions; 2 , the switching signal having a DO (TTL) output and analog output AO ; 3, TTL output valid signal is low . ( Low-level signal when the output light can be directly connected to the microcontroller or relay module ) 4 , the higher the voltage of the analog output voltage with concentration higher . 5 , for the carbon monoxide detector has good sensitivity. 6 , there are four screw holes for easy positioning ; 7 Product dimensions : 32 (L) * 20 (W) * 22 (H) 8 , has a long life and reliable stability 9 , rapid response and recovery characteristics Electrical properties: Input voltage : DC5V Power consumption ( current ): 150mA DO output : TTL digital 0 and 1 ( 0.1 and 5V) AO output :0.1-0 .3 V ( relative to pollution ) , the maximum concentration of a voltage of about 4V Special note: After the sensor is powered , needs to warm up around 20S, measured data was stable , heat sensor is a normal phenomenon , because the internal heating wire , if hot is not normal .

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