This air quality sensor sensor module is made using MQ135, a low cost semiconductor sensor which can detect the presence of Ammonia (NH3), Mono-nitrogen oxides (NOx), Alcohol, Benzene, Smoke, Carbon-dioxide (CO2) etc. It has good sensitivity to harmful gases in a wide range. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. It’s conductivity increases as the concentration of sensing gases increases. This module provides both digital and analog outputs. MQ135 Air Quality Sensor module can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc.

Features

• Low Cost
• Stable and Long Life
• Good sensitivity to harmful gases in wide range
• High sensitivity to Ammonia, Sulfide and Benzene
• On-board LED indicator
• Both digital and analog outputs

Technical Data

• Operating Voltage : 5V ±0.1
• Operating Temperature : -10°C ~ 45°C
• Detection Concentration : 10 ~ 300 ppm of NH3, 10 ~ 1000 ppm of Benzene, 10 ~ 300 ppm of Alcohol

Applications

• Industrial air pollution detector
• Domestic air pollution detector
• Portable air pollution detector
• Air quality control equipments

Datasheet

• MQ135 Air Quality Sensor Datasheet