MQ-135 PDF Datasheet – Gas Sensor – Hanwei

The MQ-135 gas sensor module is designed to detect and measure the concentration of harmful gases in the air. It utilizes a tin dioxide (SnO2) semiconductor sensing element to detect the presence of target gases. The sensor module provides an analog output voltage that varies based on the concentration of the detected gas. The output voltage can be measured and processed using analog-to-digital converters (ADCs) or microcontrollers to determine the gas concentration levels.

Part Number: MQ135

Function: Gas Sensor

Manufacturer: Hanwei Electronics ( )

Images:MQ-135 pinout gas sensor

1. Gas sensing layer SnO2

2. Electrode Au

3. Electrode line Pt

4. Heater coil Ni-Cr alloy

5. Tubular ceramic Al2O3

6. Anti-explosion network Stainless steel gauze (SUS316 100-mesh)

7. Clamp ring Copper plating Ni

8. Resin base Bakelite

9. Tube Pin Copper plating Ni


MQ-135 is a gas sensor module that is commonly used for detecting various harmful gases in the air. It is particularly sensitive to gases such as carbon monoxide (CO), nitrogen dioxide (NO2), ammonia (NH3), benzene, smoke, and other volatile organic compounds (VOCs).



MQ-135 pdf datasheet


1. Wide detecting scope

2. Fast response and High sensitivity

3. Stable and long life

4. Simple drive circuit



They are used in air quality control equipments for buildings/offices, are suitable for detecting of NH3,NOx, alcohol, Benzene, smoke,CO2 ,etc.

MQ-135 PDF Datasheet