GM-702B MEMS Carbon Monoxide/Hydrogen Gas Sensor

  • • Carbon monoxide sensor (CO) : 10–5000ppm
  • • Hydrogen sensor (H2): 10-500ppm
  • • Application: carbon monoxide/ hydrogen leaks in electronic products such as mobile phones

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Principle Introduction:
 MEMS carbon monoxide/hydrogen 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 :
 It is suitable for the detection of carbon monoxide/ hydrogen leaks in electronic products such as mobile phones. It is also applicable to CO toxic gas leak monitoring devices, gas leak detectors, fire/ safety detection systems for household, commercial use and automobiles.
Technical parameters :
 Technical Index                                           

Gas sensor character

Symbol

standard

Minimum

Maximum

Unit

Sensor Resistance

R0

-

0.4

50

  KΩ

Gas (CO) concentration

FS

-

10

10000

ppm

Sensitivity

S

0.3

0.1

0.5

-

 

 

Note
1.R0 is measured at ambient temperature 23 ± 5 ℃, humidity at 50 ± 10% RH standard working conditions;
2. S is the ratio : Rs (in 150ppm CO) / R0(in air) at ambient temperature of 23 ± 5 ℃, humidity 50 ± 10% RH

Reference Circuit :
 

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