MQ-4

HANWEI ELECTRONICS MQ-4 www.hwsensor.com TECHNICAL DATA MQ-4 GAS SENSOR FEATURES * High sensitivity to CH4，Natural gas. * 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 CH4,Natural gas.LNG, avoid the noise of alcohol and cooking fumes and cigarette smoke. SPECIFICATIONS A. Standard work condition Symbol Vc VH PL RH Parameter name Circuit voltage Heating voltage Load resistance Heater resistance Technical condition 5V±0.1 5V±0.1 20KΩ 33Ω±5% Remarks AC OR DC ACOR DC Room Tem PH Heating consumption B. Environment condition less than 750mw Symbol Tao Parameter name Using Tem Technical condition -10℃-50℃ Remarks Tas Storage Tem -20℃-70℃ RH Related humidity less than 95%Rh O2 Oxygen concentration 21%(standard condition)Oxygen minimum value is concentration can affect sensitivity over 2% C. Sensitivity characteristic Symbol Rs Parameter name Sensing Resistance Technical parameter 10KΩ- 60KΩ (1000ppm CH4 ) Ramark 2 Detecting concentration scope： 200-10000ppm α (1000ppm/ Concentration slope rate ≤0.6 CH4 , natural gas 5000ppm CH4) Standard detecting condition Temp: 20℃±2℃ Vc:5V±0.1 Humidity: 65%±5% Vh: 5V±0.1 Preheat time Over 24 hour D. Strucyure and configuration, basic measuring circuit Parts 1 Gas sensing layer 2 Electrode 3 Electrode line 4 Heater coil 5 Tubular ceram...