MQ135 Gas Sensor

The MQ135 Gas Sensor Module is a versatile air quality sensor designed to detect a wide range of toxic and harmful gases, including ammonia (NH₃), sulfur (S), benzene, smoke, carbon dioxide (CO₂), and nitrogen oxides. Ideal for indoor air quality monitoring systems, pollution control equipment, and smart home devices, the MQ135 helps measure air quality and detect dangerous gas levels. It uses SnO₂ (tin dioxide) as the sensitive material and offers both analog and digital outputs, making it easy to interface with Arduino, Raspberry Pi, ESP8266, and other development boards. With low power consumption, fast response, and adjustable sensitivity, the MQ135 is perfect for creating compact and effective air quality monitoring solutions.

Key Features:

• Detects a wide range of harmful gases: NH₃, NOx, alcohol, benzene, smoke, CO₂

• High sensitivity to multiple air pollutants

• Analog and digital output options

• Adjustable sensitivity via onboard potentiometer

• Ideal for indoor air quality monitoring

• Fast response and quick recovery time

• Long life and stable performance

• Compatible with Arduino, ESP32, Raspberry Pi, and other microcontrollers

• Simple to use and integrate

Specifications:

• Model: MQ135 Gas Sensor

• Gases Detected: Ammonia (NH₃), nitrogen oxides (NOx), alcohol, benzene, smoke, carbon dioxide (CO₂), and other harmful gases

• Operating Voltage: 5V DC

• Detection Range: 10 – 1000 ppm

• Heater Voltage: 5V ±0.2V

• Load Resistance: Adjustable

• Sensitivity: High to a broad range of toxic gases

• Response Time: < 30 seconds

• Preheat Time: ≥ 20 seconds

• Operating Temperature: -10°C to +50°C

• Output Type: Analog & Digital

• Dimensions: Approx. 32mm x 22mm x 27mm (module form)