MQ135 Gas Sensor module for Air Quality having Digital as well as Analog output. The sensitive material of the MQ135 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exists, The sensors conductivity is higher along with the gas concentration rising. MQ135 gas sensor has a high sensitivity to Ammonia, Sulphide and Benze steam, also sensitive to smoke and other harmful gases. It is at a low cost and suitable for different applications. Used for family, surrounding environment noxious gas detection device, Apply to ammonia, aromatics, sulfur, benzene vapor, and other harmful gases/smoke, gas detection, tested concentration range: 10 to 1000 ppm.

MQ135 Gas Sensor Specifications:

Working Voltage: DC 5V
Working Current: 150mA
DOUT: TTL output
AOUT: Analog output
Preheat Time: Over 20s

MQ135 Gas Sensor Features:

Sensitivity to Ammonia, Sulphide, and Benzene steam
With signal output instructions
The TTL output signal is a low level
Analog 0 ~ 5 v voltage output, the higher the concentration, the higher the voltage
The color is showing pictures.
Sensitive for benzene, alcohol, smoke
Fast response and recovery
Adjustable sensitivity
Signal output indicator
Output voltage boosts along with the concentration of the measured gases increases.