• CO gas sensor

MQ-7B Carbon Monoxide Sensor

  • • Detection Gas: CO, carbon monoxide
  • • Detection Range: 10~500ppm CO
  • • Application: domestic CO gas leakage alarm

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Principle Introduction:
Winsen Electronics is original manufacturer of MQ-7B Carbon Monoxide gas sensor, CO Gas sensor, with 80% market share in gas sensor field.
Sensitive material of MQ-7B gas sensor is SnO2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO at low temperature(heated by 1.5V).The sensor’s conductivity gets higher along with the CO gas concentration rising. At high temperature(heated by 5.0V),it cleans the other gases adsorbed at low temperature. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
Applications :
It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.
Technical parameters :
Model MQ-7B
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
Reference Circuit :
 

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