Ximimark 3Pcs MQ135 MQ135 Air Quality Sensor Hazardous Gas Detection Module for Arduino

The gas-sensitive material used in the MQ135 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is a polluting gas in the environment, the conductivity in the sensor increases with the concentration of polluted gas in the air. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. Specifications: Size:32* 20* 22mm (L*W*H) 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 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. The installation of electronic modules requires basic knowledge and requires a certain electronic professional foundation and hands-on ability. Please purchase carefully! Manual measurement, with small error. Please check size in detail before purchase. Real colors may slightly differ from the pictures, as it depends on specific monitor settings and light brightness. We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Package Includes: 3Pcs