MQ-3

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 (SUS3...