MQ7

HANWEI ELECTRONICS CO ., LTD MQ –7 http://www.hwsensor.com TECHNICAL DATA FEATURES * High sensitivity to carbon monoxide * Stable and long life MQ-7 GAS SENSOR 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 Vc circuit voltage VH (H) Heating voltage (high) VH (L) Heating voltage (low) RL Load resistance RH Heating resistance TH (H) Heating time (high) TH (L) Heating time (low) PH Heating consumption b. Environment conditions Symbol Tao Tas RH O2 Parameters Using temperature Storage temperature Relative humidity Oxygen concentration Technical condition 5V±0.1 5V±0.1 1.4V±0.1 Can adjust 33Ω±5% 60±1 seconds 90±1 seconds About 350mW Remark Ac or Dc Ac or Dc Ac or Dc Room temperature 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 www.DataSheet4U.com D. Structure and configuration, bas...