MQ135 Datasheet – Cas Sensor Manual

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.


MQ135 GAS Sensor


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.


MQ135 datasheet pinout


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


MQ135 Datasheet PDF Download


DT9205A Manual PDF – Digital Multimeter – Excel

This is one of the Digital Multimeter types.

Part Number : DT9205A

Function : Digital Multimeter

Dimensions: 191mm L x 89mm W x 35mm H.

Manufactures : Excel

See the preview image and the PDF file for more information.


DT9205A digital multimeter manual



The DT9205A Digital Multimeter is a precision, battery powered, 3-1/2 digit LCD Digital Instrument.

1. High accuracy

2. Digit height 33mm

3. Single 32 position rotary switch for FUNCTION and RANGE selection, allows fast and convenient operation.

4. Curvilinear soft case.

5. Auto-Power Off


DT9205A Specification

1. Display: 3-1/2 digits LCD with a maximum reading of 1999.

2. Measurement rate: updates 2-3 sec.

3. Over range indication: “1” figure only in the display

4. Automatic negative polarity indication.

5. The symbol is displayed when the battery voltage drops below the operating voltage.

6. Full range over load protection.

7. Capacitance measurement Auto-zeroing.

8. Auto Power Off. Automatic cut off approx. 15 minutes after the power on. It needs to be switched off and on again to continue operation.


DT9205A Manual PDF

DT9205A pdf