GM-402B MEMS Combustible Gas Sensor

  • • Detection: CH4, 0~1000PPM
  • • Detection: C3H8, 0~5000PPM
  • • Usage: Gas leak detection for mobile phones, computers and other consumer electronics applications

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  • Principle Introduction
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 circuit VH:2.8V±0.1V;VC :5.0V±0.1V

Reference Circuit :

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