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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