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| HANWEI SENSORS MQ-6 www.hwsensor.com TECHNICAL DATA MQ-6 GAS SENSOR www..com FEATURES * High sensitivity to LPG, iso-butane, propane * Small sensitivity to alcohol, smoke. * Fast response . * 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, iso-butane, propane, LNG, avoid the noise of alcohol and cooking fumes and cigarette smoke. SPECIFICATIONS A. Standard work condition Symbol Vc VH PL RH PH Symbol Tao Tas RH O2 Parameter name Circuit voltage Heating voltage Load resistance Heater resistance Heating consumption Parameter name Using Tem Storage Tem Related humidity Oxygen concentration Technical condition 5V0.1 5V0.1 20K 335% less than 750mw Technical condition -10-50 -20-70 less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 10K- 60K (1000ppm LPG ) 0.6 Vc:5V0.1 Vh: 5V0.1 Remarks AC OR DC ACOR DC Room Tem B. Environment condition Remarks minimum value is over 2% Remarks Detecting concentration scope 200-10000ppm LPG , iso-butane, C. Sensitivity characteristic Symbol Rs Parameter name Sensing Resistance (1000ppm/ 4000ppm LPG) Standard detecting condition Preheat time Concentration slope rate Temp: 202 Humidity: 65%5% propane, LNG Over 24 hour D. Strucyure 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 TEL:86-371-67169080 A FAX: 86-371-67169090 A E-mail:sales@hwsensor.com HANWEI SENSORS MQ-6 www.hwsensor.com Structure and configuration of MQ-6 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 sensitive components. The enveloped MQ-6 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 Fig.2 sensitivity characteristics of the MQ-6 10 MQ-6 Fig.3 is shows the typical sensitivity characteristics of the MQ-6 for several gases. in their: Temp: 20 Humidity: 65% O2 concentration 21% RL=20k Ro: sensor resistance at 1000ppm of LPG in the clean air. Rs:sensor resistance at various concentrations of gases. LPG H2 CH4 CO Alcohol Air Rs/Ro 1 ppm 1000 10000 0.1 100 MQ-6 1.4 1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 0.5 -10 0 10 20 Temp Fig.4 is shows the typical dependence of the MQ-6 on temperature and humidity. 33%RH 85%RH Ro: sensor resistance at 1000ppm of LPG in air at 33%RH and 20 degree. Rs: sensor resistance at 1000ppm of LPG in air at different temperatures and humidities. Rs/Ro Fig.4 30 40 50 SENSITVITY ADJUSTMENT Resistance value of MQ-6 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 of LPG concentration in air and use value of Load resistance ( RL) about 20K(10K to 47K). When accurately measuring, the proper alarm point for the gas detector should be determined after considering the temperature and humidity influence. TEL:86-371-67169080 FAX: 86-371-67169090 E-mail:sales@hwsensor.com |
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