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| HANWEI ELETRONICS CO.,LTD MQ-2 http://www.hwsensor.com TECHNICAL DATA MQ-2 GAS SENSOR FEATURES Wide detecting scope Fast response and High sensitivity Stable and long life Simple drive circuit APPLICATION They are used in gas leakage detecting equipments in family and industry, are suitable for detecting of LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke. SPECIFICATIONS A. Standard work condition Symbol Vc VH www..com 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 335% less than 800mw Technical condition -20-50 -20-70 less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 3K-30K (1000ppm iso-butane ) 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% Remarks Detecting concentration scope 200ppm-5000ppm LPG and propane 300ppm-5000ppm butane 5000ppm-20000ppm methane 300ppm-5000ppm H2 100ppm-2000ppm Alcohol C. Sensitivity characteristic Symbol Rs Parameter name Sensing Resistance Concentration Slope rate Temp: 202 Humidity: 65%5% (3000/1000) isobutane Standard Detecting Condition Preheat time 0.6 Vc:5V0.1 Vh: 5V0.1 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-2 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 TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com HANWEI ELETRONICS CO.,LTD MQ-2 http://www.hwsensor.com crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of sensitive components. The enveloped MQ-2 have 6 pin ,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 10 MQ-2 Fig.3 is shows the typical sensitivity characteristics of the MQ-2 for several gases. in their: Temp: 20 Humidity: 65% O2 concentration 21% RL=5k Ro: sensor resistance at 1000ppm of H2 in the clean air. Rs:sensor resistance at various concentrations of gases. www..com Rs/Ro 1 H2 LPG CH4 CO alcohol smoke propane air ppm 1000 10000 0.1 100 Fig.2 sensitivity characteristics of the MQ-2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -20 -10 0 10 20 30 40 50 60 Rs/Ro 33%RH 85%RH Fig.4 is shows the typical dependence of the MQ-2 on temperature and humidity. Ro: sensor resistance at 1000ppm of H2 in air at 33%RH and 20 degree. Rs: sensor resistance at 1000ppm of H2 at different temperatures and humidities. Fig.4 degree SENSITVITY ADJUSTMENT Resistance value of MQ-2 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 1000ppm liquified petroleum gas TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 E-mail: sales@hwsensor.com |
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