Model MQ-7
Sensor Type Semiconductor
Standard Encapsulation Plastic cap
Target Gas carbon monoxide
Detection range 10~500ppm CO
Standard Circuit
Conditions
Loop Voltage Vc ≤10V DC
Heater Voltage VH
5.0V±0.1V AC or DC(High tem.)
1.5V±0.1V AC or DC(Low tem.)
Heater Time TL
60 S±1S(High tem.),
90 S±1S(Low tem.)
Load Resistance RL Adjustable
Sensor character
under standard
test conditions
Heater Resistance RH 29Ω±3Ω(room tem.)
Heater consumption PH ≤900mW
Sensitivity S Rs(in air)/Rs(in 150ppm CO)≥5
Output Voltage Vs 2.5V~4.3V (in 150ppm CO)
Concentration Slope α ≤0.6(R300ppm/R50ppm CO)
Standard test
conditions
Tem. Humidity 20℃±2℃;55%±5%RH
Standard test circuit
Vc:5.0V±0.1V;
VH(High tem.): 5.0V±0.1V;
VH (Low tem.): 1.5V±0.1V
Preheat time Over 48 hours