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Semiconductor Combustible Gas Sensor MQ-2B

Summary:

Sensitive material of MQ-2B 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-2B 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.

Feature:

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

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APPLICATION

Home Combustible Gas Alarm

The combustible gas alarm is an alarm device for detecting gas leakage. The component that reacts to the combustible gas is a gas sensor, and the response signal is converted into an electrical signal through the circuit board. When the combustible gas in the air reaches a certain concentration value, the alarm will alarm. The high-end household combustible gas alarm can automatically start the exhaust equipment and close the gas pipeline valve at the same time. A wireless transmission device can be installed inside the gas alarm to realize overall monitoring and network alarm to ensure the safety of everyone's life and property.

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Industrial Combustible Gas Alarm

In the process of industrial use of combustible gas, if the combustible gas is in an incomplete combustion state or has gas leakage, etc., the combustible gas will cause personnel poisoning or fire accidents, directly threatening the life safety of personnel. Therefore, it is necessary to install an industrial-grade gas alarm. If the gas exceeds the standard in the on-site environment, the alarm can give an early warning, thereby reducing the probability of danger.

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Other Detector

Formaldehyde detector is an instrument for detecting formaldehyde. Generally, semiconductor sensors and electrochemical sensors are used to realize the rapid semi-quantification of formaldehyde in indoor air on the spot, which is characterized by simple structure, small size, intuitive,easy to carry and use.

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PARAMETER

Specification Product Size

Technical Data Sheet

Model			MQ-2B
Sensor Type			Semiconductor
Standard Encapsulation			Bakelite, Metal cap
Target Gas			Flammable gas, smoke
Detection range			300～10000ppm(flammable gas)
Standard Circuit Conditions	Loop Voltage	V_C	≤24V DC
	Heater Voltage	V_H	5.0V±0.1V AC or DC
	Load Resistance	R_L	Adjustable
Sensor character under standard test conditions	Heater Resistance	R_H	30Ω±3Ω（room temp.）
	Heater consumption	P_H	≤950mW
	Sensitivity	S	R₀(in air)/R_S(2000ppm C₃H₈)≥5
	Output Voltage	V_S	2.5V～4.0V（in 2000ppmC₃H₈）
	Concentration Slope	α	≤0.6(R_3000ppm/R_1000ppm C₃H₈)
Standard test conditions	Tem. Humidity		20℃±2℃；55%±5%RH
	Standard test circuit		V_C: 5.0V±0.1V； V_H: 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

MQ-2

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Semiconductor Combustible Gas Sensor MQ-2

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