AEAAICO MQ7 Gas Sensor – Carbon Monoxide (CO) Gas Sensor

a. Connect the sensor to the application circuit. b. Turn on the power, keep preheating through electricity over 48 hours. c. Adjust the load resistance RL until you get a signal value which is respond to a certain carbon monoxide concentration at the end point of 90 seconds. d. Adjust the another load resistance RL until you get a signal value which is respond to a CO concentration at the end point of 60 seconds . SPECIFICATIONS A. Standard work condition Symbol Parameter name Technical condition Remark Vc circuit voltage 5V±0.1 Ac or Dc VH (H) Heating voltage (high) 5V±0.1 Ac or Dc VH (L) Heating voltage (low) 1.4V±0.1 Ac or Dc RL Load resistance Can adjust RH Heating resistance 33?±5% Room temperature TH (H) Heating time (high) 60±1 seconds TH (L) Heating time (low) 90±1 seconds PH Heating consumption About 350mW Parts Materials 1 Gas sensing layer SnO2 2 Electrode Au 3 Electrode line Pt 4 Heater coil Ni-Cr alloy 5 Tubular ceramic Al2O3 6 Anti-explosion network Stainless steel gauze (SUS316 100-mesh) 7 Clamp ring Copper plating Ni 8 Resin base Bakelite 9 Tube Pin Copper plating Ni