MQ-9B CO & CH4 Detection Sensor

  • • Detection Gas: Dual gas, Carbon Monoxide & Methane
  • • Detection Range: 10~500ppm CO,300~10000ppm CH4
  • • Application: domestic CO gas leakage alarm

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  • Principle Introduction
Principle Introduction:
Winsen Electronics, as a professional gas sensing solution provider with over 30 years gas sensor manufacture experience, offers semiconductor gas sensor for CO & Methane use.
Sensitive material of MQ-9B gas sensor is SnO2, which with lower conductivity in clean air. It detects carbon monoxide (1.5V) by method of cycle high and low temperature. At high temperature (5.0V), it can detect CO as well as clean the other gases adsorbed at low temperature. The sensor’s conductivity gets higher along with the CO and CH4 gas concentration rising. 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 :

Tips:For more parameter information, please refer to the latest manual provided by salesman.

Model MQ-9B
Sensor Type Semiconductor
Standard Encapsulation Plastic, Metal cap
Target Gas Carbon Monoxide, Methane
Detection range 10~500ppm CO,300~10000ppm CH4
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 60S±1S(High tem.) 90S±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 Rs(in air)/Rs(in 5000ppm CH4)≥3
Output Voltage Vs 2.5V ~ 4.3V (in 150ppm CO) 2.0V ~ 4.0V (in 5000ppm CH4)
Concentration Slope α ≤0.6(R300ppm/R50ppm CO) ≤0.6(R5000ppm/R1000ppm CH4)
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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