Description:

• MQ135 adopts SnO2 as its gas sensitive material because SnO2 has low electrical conductivity in the clean air.
• So when surrounded by polluted air, the electrical conductivity of MQ135 will increase with the increase of pollutants, and the change in electrical conductivity can be converted to corresponding output signal.  
• MQ135 has a high sensitivity to Ammonia, sulfide,  benzene vapor, smoke and other harmful gas. It can detect various harmful gases, making it a cost-effective choice suitable for multiple applications.
• Target gas: Ammonia; methylbenzene; hydrogen
• Product type: Semiconductor gas sensor

Specification:

• Product model: MQ135
• Standard Package: Bakelite (Black Bakelite)
• Target gas: Ammonia; methylbenzene; hydrogen
• Standard circuit: Loop voltage  Vc ≤24V  DC
• Heater voltage: VH 5.0V±0.2V AC or DC
• Load resistance: Adjustable RL
• Features of sensitive components under standard test condition: Heating resistor RH 31&;±3&; (room temperature)
• Heater power consumption: PH ≤900mW
• Surface resistance of sensitive material: Rs 2K&;-20K&;(in 100ppm NH3)
• 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

Package Includes:

• 1x MQ135 Air Quality Sensor for