MQ-4B Semiconductor Sensor for Flammable Gas

Household flammable Gas Sensor

Applications :

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

Product Advantages:

*It has good sensitivity to methane in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.

Product Description:

Sensitive material of MQ-4B 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-4B gas sensor has high sensitivity to methane, also has anti-interference to alcohol and other gases.

Technical Parameters:

Model			MQ-4B
Sensor Type			Semiconductor
Standard Encapsulation			Plastic
Target Gas			Methane
Detection range			300～10000ppm(CH4)
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	26Ω±3Ω(room temp.)
	Heater consumption	PH	≤950mW
	Sensitivity	S	Rs(in air)/Rs(in 5000ppmCH4)≥5
	Output Voltage	Vs	2.5V～4.0V (in 5000ppm CH4)
	Concentration Slope	α	≤0.6(R5000ppm/R1000ppm CH4)
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		Not less than 48 hours
	O2 content		21%（not less than 18%） O2 concentration effects initial value, sensitivity and repeatability.
Lifespan			10 years