This is one of the cas sensor types.
Part Number : MQ135
Function : Air Quality Cas Sensor
Package : Module Type
Manufacturers : Hanwei
See the preview image and the MQ135 datasheet file for more information.
Sensitive material of MQ135 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.
Resistance value of MQ-135 is difference to various kinds and various concentration gases. So,When using this components, sensitivity adjustment is very necessary. we recommend that you calibrate the detector for 100ppm NH3 or 50ppm Alcohol concentration in air and use value of Load resistancethat( RL) about 20 KΩ (10KΩ to 47 KΩ ). When accurately measuring, the proper alarm point for the gas detector should be determined after considering the temperature and humidity influence.
1. Wide detecting scope
2. Fast response and High sensitivity
3. Stable and long life
4. Simple drive circuit
They are used in air quality control equipments for buildings/offices, are suitable for detecting of NH3,NOx, alcohol, Benzene, smoke,CO2 ,etc