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MQ-3

HANWEI ELETRONICS
Part Number MQ-3
Manufacturer HANWEI ELETRONICS
Description GAS SENSOR
Published Feb 25, 2015
Detailed Description HANWEI ELETRONICS CO.,LTD MQ-3 http://www.hwsensor.com TECHNICAL DATA MQ-3 GAS SENSOR FEATURES * High sensitivity ...
Datasheet PDF File MQ-3 PDF File

MQ-3
MQ-3

Overview
HANWEI ELETRONICS CO.
,LTD MQ-3 http://www.
hwsensor.
com TECHNICAL DATA MQ-3 GAS SENSOR FEATURES * High sensitivity to alcohol and small sensitivity to Benzine .
* Fast response and High sensitivity * Stable and long life * Simple drive circuit APPLICATION They are suitable for alcohol checker, Breathalyser.
SPECIFICATIONS A.
Standard work condition Symbol Parameter name Vc Circuit voltage VH Heating voltage RL Load resistance RH Heater resistance PH Heating consumption B.
Environment condition Technical condition 5V±0.
1 5V±0.
1 200KΩ 33Ω±5% less than 750mw Symbol Tao Parameter name Using Tem Technical condition -10℃-50℃ Tas Storage Tem -20℃-70℃ RH Related humidity less than 95%Rh O2 Oxygen concentration 21%(standard condition)Oxygen concentration can affect sensitivity C.
Sensitivity characteristic Symbol Rs Parameter name Sensing Resistance Technical parameter 1MΩ- 8 MΩ (0.
4mg/L alcohol ) α (0.
4/1 mg/L) Concentration slope rate ≤0.
6 Standard detecting condition Preheat time Temp: 20℃±2℃ Vc:5V±0.
1 Humidity: 65%±5% Vh: 5V±0.
1 Over 24 hour D.
Structure and configuration, basic measuring circuit Remarks AC OR DC ACOR DC Room Tem Remarks minimum value is over 2% Remarks Detecting concentration scope： 0.
05mg/L—10mg/L Alcohol Parts 1 Gas sensing layer 2 Electrode 3 Electrode line 4 Heater coil 5 Tubular ceramic 6 Anti-explosion network 7 Clamp ring 8 Resin base 9 Tube Pin Materials SnO2 Au Pt Ni-Cr alloy Al2O3 Stainless steel gauze (SUS316 100-mesh) Copper plating Ni Bakelite Copper plating Ni Configuration A Fig.
1 Configuration B Fig.
2 A TEL: 86-371- 67169070 67169080 FAX: 86-371-67169090 A E-mail: sales@hwsensor.
com HANWEI ELETRONICS CO.
,LTD MQ-3 http://www.
hwsensor.
com Structure and configuration of MQ-3 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 stain...


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