MQ-7 Datasheet | Hanwei

FEATURES - High sensitivity to carbon monoxide - Stable and long life APPLICATION They are used in gas detecting equipment for carbon monoxide (CO) in family and industry or car. SPECIFICATIONS A. Standard work condition Symbol Parameter name Technical condition Remark Vc circuit voltage Ac or Dc 5V±0.1 VH (H) Heating voltage (high) Ac or Dc 5V±0.1 VH (L) Heating voltage (low) Ac or Dc 1.4V±0.1 RL Load resistance Can adjust RH Heating resistance Room temperature 33Ω ±5% TH (H) Heating time (high) 60±1 seconds TH (L) Heating time (low) 90±1 seconds PH Heating consumption About 350m W b. Environment conditions Symbol Tao Tas RH O2 Parameters Using temperature Storage temperature Relative humidity Oxygen concentration Technical conditions -20℃…+50℃ -20℃…+50℃ Less than 95%RH 21%(stand condition) the oxygen concentration can affect the sensitivity characteristic Remark Advice using scope Minimum value is over 2% c. Sensitivity characteristic Parameters Technical parameters Remark Surface resistance In 100ppm Of sensitive body 2-20k Carbon Monoxide Concentration slope rate Less than 0.5 Rs (300ppm)/Rs(100ppm) Temperature -20℃±2℃ relative humidity 65%±5% RL:10KΩ ±5% Vc:5V±0.1V VH:5V±0.1V VH:1.4V±0.1V No less than 48 hours Detecting range: 20ppm-2000ppm carbon monoxide symbol Rs а (300/100ppm) Standard working condition Preheat time D. Structure and configuration, basic measuring circuit Structure and configuration of MQ-7 gas sensor is shown as Fig. 1 (Configuration A or B), sensor posed by micro AL2O3 ceramic tube, Tin Dioxide (Sn O2) 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 ponents. The enveloped MQ-7 have TEL:86-371-67169070 67169080 FAX:86-371-67169090 Email: sensor@371.net .. HANWEI ELECTRONICS CO ., LTD - 7 http://.hwsensor. 6 pin ,4 of them are used to fetch signals, and other 2 are used for providing heating...