MQ-2 Smoke Sensor

Principle Introduction:
Winsen Electronics, manufacture original and new smoke gas sensor, propane gas sensor with long lifespan and low price, for domestic gas leakage alarm and flammable gas alarm use.
Sensitive material of MQ-2 gas sensor is SnO2, which with lower conductivity in clean air. When the target flammable gas exist, 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-2 gas sensor has high sensitivity to propane and smoke, also can detect the natural gas and other flammable steam well. It is with low cost and suitable for different applications of detecting kinds of flammable gases.

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-2
Sensor Type			Semiconductor
Standard Encapsulation			Bakelite, Metal cap
Target Gas			Flammable gas, smoke gas sensor
Detection range			300～10000ppm(flammable 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	≤950mW
	Sensitivity	S	Ro(in air)/Rs(2000ppm C3H8)≥5
	Output Voltage	Vs	2.5V～4.0V（in 2000ppmC3H8）
	Concentration Slope	α	≤0.6(R3000ppm/R1000ppm C3H8)
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

NOTE: Output voltage(Vs) is VRL in test environment.

Reference Circuit :