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MQ-135 Air Quality Sensor


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MQ-135 Air Quality Sensor


This is a commonly used air quality sensor. The gas sensing material used in this sensor is tin oxide (SnO2) with low conductivity in clean air. When there is a polluting gas in the environment where the sensor is located, the conductivity of the sensor increases as the concentration of the polluting gas in the air increases. The sensor is highly sensitive to ammonia, sulfides, and benzene vapors, and is ideal for monitoring smoke and other harmful gases.


  • Working voltage: DC 5V
  • Control signal: digital signal (D0)
  • Analog signal (A0)
  • Positioning hole size: 3mm in diameter
  • Size: 45*26*19mm
  • Weight: 8.3g


  • Product type: Semiconductor gas sensor
  • Target gas: Ammonia; Methylbenzene; Hydrogen
  • Operating voltage: 5V
  • Heater voltage: VH 5.0V±0.2V AC or DC
  • Load resistance: Adjustable RL
  • Heater power consumption: PH ≤900mW
  • Sensitivity: S Rs(in air)/Rs(100ppmNH3)≥5
  • Concentration slope: α ≤0.6 (R100ppm/R50ppm NH3)
  • Standard testing temperature/humidity: 20℃±2℃/65%±5%RH
  • Standard testing circuit: Vc:5.0V±0.1V; VH: 5.0V±0.1V
  • Preheating time: ≧48H
Weight 8.3 g
Dimensions 5 × 5 × 2 cm

Header pins soldered on

Not Soldered

Header pins not soldered onto board

SKU: comp-air-mq135 Category: Tags: , , , , , ,