MQ-137

HANWEI ELECTRONICS CO.,LTD TECHNICAL DATA MQ-137 http://www.hwsensor.com MQ-137 GAS SENSOR FEATURES Fast response and High sensitivity Stable and long life Simple drive circuit APPLICATION They are used in air quality control equipments for buildings/factory, are suitable for detecting of NH3. 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 Symbol Parameter name Tao Using Tem Tas Storage Tem RH Related humidity O2 Oxygen concentration C. Sensitivity characteristic Symbol Parameter name Ro Sensing Resistance Technical condition 5V±0.1 5V±0.1 can adjust 31 5% less than 800mw Technical condition -10 -45 -20 -70 less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 900K -4900K ( in air ) Concent rat ion (20/10) Slope rate 0.65 NH3 Standard Detecting Condition Temp: 20 2 Vc:5V±0.1 Humidity: 65%±5% Vh: 5V±0.1 Preheat time 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 5-200ppm NH3 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 Bakel...