MQ-135 Air Quality Gas Sensor Module

About this product

Semiconductor air quality sensor for detecting NH3, NOx, alcohol, benzene, smoke, and CO2. Uses tin dioxide (SnO2) sensitive layer with analog and digital outputs. Suited for air quality monitoring, ventilation control, and environmental sensing projects.

Ultrasonic, IR, temperature, humidity, motion, current, camera and RF sensor modules - plus relay, logic-level and breakout boards for prototyping and production.

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Specifications

Operating Voltage

5V DC

Detection Range

10 to 1000 ppm (NH3, benzene, alcohol)

Target Gases

NH3, NOx, alcohol, benzene, smoke, CO2

Output

Analog (0V to 5V) and digital (TTL)

Heater Voltage

5.0V ± 0.1V

Heater Resistance

33Ω ± 5%

Preheat Time

Over 24 hours

Dimensions

56 x 20 x 18mm