Principle Introduction:
MEMS combustible gas sensor is using MEMS micro-fabrication hot plate on a Si substrate base, gas-sensitive materials used in the clean air with low conductivity metal oxide semiconductor material. When the sensor exposed to gas atmosphere, the conductivity is changing as the detected gas concentration in the air. The higher the concentration of the gas, the higher the conductivity. Use simple circuit can convert the change of conductivity of the gas concentration corresponding to the output signal.

Applications :
Gas leak detection for mobile phones, computers and other consumer electronics applications; also apply for home, commercial use of the combustible gas leakage monitoring devices, gas leak detectors, fire / security detection system.

Technical parameters :

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

Part No.			GM-402B
Sensor Type			MEMS
Standard Encapsulation			Ceramic
Detection Gas			CH4, C3H8 &etc.
Detection Range			1~10000ppm (C3H8)
Standard Circuit Conditions	Loop Voltage	VC	≤24V DC
	Heater Voltage	VH	2.8V±0.1V AC or DC
	Load Resistance	RL	Adjustable
Sensor character under standard test conditions	Heater Resistance	RH	80Ω±20Ω（room temperature）
	Heater consumption	PH	≤80mW
	sensitive materials resistance	RS	1KΩ～30KΩ(in 5000ppm CH4)
	Sensitivity	S	R0(in air)/Rs(in 5000ppmCH4)≥2
	Concentration slope	α	≤0.9(R5000ppm/R1000ppmCH4)
Standard test conditions	Temp. Humidity		20℃±2℃；55%±5%RH
Standard test conditions	Standard test circuit		VH:2.8V±0.1V；VC:5.0V±0.1V

Reference Circuit :

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