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