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.

Character:
MEMS technology, strong structure
Low power consumption
High sensitivity
Fast response and resume
Simple drive circuit

Application:
Gas leak detection for mobile phones, computers and other consumer electronics applications, also for breathing gas detection control, smoke alarm indoor & etc.

Product model: GM-502B

Product type: MEMS VOC gas sensor

Standard package: ceramic package

Detection gas: Ethanol, formaldehyde, toluene &etc.

Detection concentration: 1~500ppm

Standard circuit conditions

Loop voltage VC: ≤24V DC

Heating voltage VH: 2.5V±0.1V AC or DC (high temperature)/0.5V±0.1V AC or DC (low temperature)

Heating time TL: 60s±1s (high temperature), 90s±1s (low temperature)

Load resistance RL: adjustable

Gas sensor characteristics under standard test conditions

Heating resistance RH: 80Ω±20Ω (room temperature)

Heating power consumption PH: ≤50mW

Sensitive body resistance RS: 1KΩ~30KΩ (in 150ppmCO)

Sensitivity S: R0(in air)/Rs(in 150ppmCO)≥3

Standard test conditions

Temperature and humidity: 20ºC±2ºC; 55%±5%RH

Standard test circuit:

VH: 2.5V±0.1V (high temperature)/0.5V±0.1V (low temperature)

VC: 5.0V±0.1V