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| www..com HANWEI ELCETRONICS CO.,LTD MQ-135 http://www.hwsensor.com TECHNICAL DATA MQ-135 GAS SENSOR FEATURES Wide detecting scope Fast response and High sensitivity Stable and long life Simple drive circuit APPLICATION 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 5V0.1 5V0.1 can adjust 33 5% less than 800mw Technical condition -10...+45 -20...+70 less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 30K -200K (100ppm NH3 ) 0.65 Vc:5V0.1 Vh: 5V0.1 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: 202 Humidity: 65%5% (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 A A 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: sensor@371.net www..com HANWEI ELCETRONICS CO.,LTD MQ-135 http://www.hwsensor.com sensitive components. The enveloped MQ-135 have 6 pins ,4 of them are used to fetch signals, and other 2 are used for providing heating current. Electric parameter measurement circuit is shown as Fig.2 E. Sensitivity characteristic curve Fig.2 sensitivity characteristics of the MQ-135 10 MQ-135 AI R CO 2 CO NH4 Fig.3 is shows the typical sensitivity characteristics of the MQ-135 for several gases. in their: Temp: 20 Humidity: 65% O2 concentration 21% RL=20k Ro: sensor resistance at 100ppm of NH3 in the clean air. Rs: sensor resistance at various concentrations of gases. Rs/Ro 1 ppm 0. 1 10 100 1000 1. 8 1. 6 1. 4 Rs/Ro 1. 2 1 0. 8 0. 6 0. 4 0. 2 0 33% H R 85% H R Fig.4 is shows the typical dependence of the MQ-135 on temperature and humidity. Ro: sensor resistance at 100ppm of NH3 in air at 33%RH and 20 degree. Rs: sensor resistance at 100ppm of NH3 at different temperatures and humidities. Fig.4 degr ee 0 10 20 30 40 50 60 - 20 - 10 SENSITVITY ADJUSTMENT 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 K (10K to 47 K ). When accurately measuring, the proper alarm point for the gas detector should be determined after considering the temperature and humidity influence. TEL: 86-371-67169070 67169080 FAX: 86-371-67169090 E-mail: sensor@371.net |
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