Principle Introduction:
Winsen Electronics is original manufacturer of MQ-8 Hydrogen gas sensor, H2 gas sensor, with 80% market share in gas sensor field.
Sensitive material of MQ-8 gas sensor is SnO2, which with lower conductivity in clean air. When hydrogen gas exists, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
MQ-8 gas sensor has high sensitivity to hydrogen gas, also has anti-interference to other gases. This sensor can detect hydrogen, especially city gas. It is a kind of low-cost sensor for kinds of applications.

Applications :
It is widely used in domestic gas leakage alarm, industrial flammable gas alarm and portable gas detector.

Technical parameters :

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

Model			MQ-8
Sensor Type			Semiconductor
Standard Encapsulation			Bakelite, Metal cap
Target Gas			Hydrogen
Detection range			100～1000ppm(H2 gas)
Standard Circuit Conditions	Loop Voltage	Vc	≤24V DC
	Heater Voltage	VH	5.0V±0.1V AC or DC
	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 1000ppm H2)≥5
	Output Voltage	Vs	2.5V～4.0V（in 1000ppm H2）
	Concentration Slope	α	≤0.6(R1000ppm/R400ppm H2)
Standard test conditions	Tem. Humidity		20℃±2℃；55%±5%RH
	Standard test circuit		Vc:5.0V±0.1V； VH:5.0V±0.1V
	Preheat time		Over 48 hours

Reference Circuit :

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