MQ-9B Semiconductor Sensor for Carbon Monoxide & Flammable Gas Detection

For civil and industrial CO & flammable gas leakage detection

Applications :

*CO & CH4 gas alarm
*CO&CH4 gas detector

Product Advantages:
  • *Low cost
  • *10 years lifetime
  • *Fast response time
  • *Simple drive circuit
Product Description:

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.

Technical Parameters:
Model MQ-9B
Sensor Type Semiconductor
Standard Encapsulation Plastic 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 temp.) 1.5V±0.1V AC or DC (Low temp.)
Heater Time TL 60S±1S (High temp.);90S±1S (Low temp.)
Load Resistance RL Adjustable
Sensor character under standard test conditions Heater Resistance RH 29Ω±3Ω(room temp.)
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 temp.):5.0V±0.1V; VH(Low temp.):1.5V±0.1V
Preheat time Over 48 hours
O2 content 21%(not less than 18%) O2 concentration effects initial value, sensitivity and repeatability.
Lifespan 10 years
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