MQ-135 PDF – Gas Sensor – Hanwei

Part Number : MQ-135, MQ135

Function : Gas Sensor

Manufactures : Hanwei Electronics

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MQ-135 image

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Description :

HANWEI ELCETRONICS CO.,LTD MQ-135 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 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: HANWEI ELCETRONICS CO.,LTD MQ-135 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 ѕ ѕ Ж« NH4 ј Ч ± Ѕ ± ы НЄ 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=20kΩ 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% R H 85% R H Fig.4 is shows the typical dependence of the MQ-135 on te […]

MQ-135 Datasheet