Part Number : MQ-135, MQ135
Function : Gas Sensor
Manufactures : Hanwei Electronics
MQ-135 is GAS SENSOR.
Wide detecting scope Fast response and High sensitivity Stable and long life 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. SPECIFICATIONS A. Standard work condition Symbol Vc VH RL RH PH Symbol Tao Tas RH O2 Parameter name Circuit voltage Heating voltage Load resistance Heater resistance Heating consumption Technical condition 5V±0.1 5V±0.1 can adjust 33Ω ±5% less than 800mw Technical condition -10℃…+45℃ -20℃…+70℃ less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 30KΩ -200KΩ (100ppm NH3 ) ≤ 0.65 Vc:5V±0.1 Vh: 5V±0.1 Remarks AC OR DC ACOR DC Room Tem B. Environment condition Parameter name Using Tem Storage Tem Related humidity Oxygen concentration Remarks minimum value is over 2% Remark 2 Detecting concentration scope： 10ppm-300ppm NH3 10ppm-1000ppm C. Sensitivity characteristic Symbol Rs Parameter name Sensing Resistance Concentration Slope rate Temp: 20℃±2℃ Humidity: 65%±5% α (200/50) NH3 Standard Detecting Condition Preheat time Benzene 10ppm-300ppm Alcohol Over 24 hour D. Structure and configuration, basic measuring circuit 1 2 3 4 5 6 7 8 9 Parts Gas sensing layer Electrode Electrode line Heater coil Tubular ceramic Anti-explosion network Clamp ring Resin base Tube Pin Materials SnO2 Au Pt Ni-Cr alloy Al2O3 Stainless steel gauze (SUS316 100-mesh) Copper plating Ni Bakelite Copper plating Ni Fig.2 Fig. 1 Configuration A Configuration B AП т AП т Structure and configuration of MQ-135 gas sensor is shown as Fig. 1 (Configuration A or B), sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of TEL: 86-371-67169070 67169080 FAX: 86-371-67169090 E-mail: firstname.lastname@example.org HANWEI ELCETRONICS CO.,LTD MQ-135 http://www.hwsensor.com […]