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Detailed Program
Paper Number : SE-I01
Time Frame : 10:45~11:10
Presentation Date : Thurse day, 27, November
Session Name : Sensor Materials
Session Chair 1# : Jong-heun Lee
Session Chair 2# : Kengo Shimanoe
Catalytic combustion type gas sensor of FIGARO engineering
Junji Omori
Figaro Engineering
Gas leak detectors become more important as safety device with the increasing use of gas in everyday life. Among a lot of gas detection technologies, catalytic combustion type gas sensor is superior in terms of high accuracy and is used in many applications with concentration display. While at the same time, it is generally recognized that the disadvantage of catalytic combustion type gas sensor is a deterioration of output signal over time.
Figaro has made a significant improvement on the long-term stability of catalytic combustion type gas sensor. Followings are our countermeasures to suppress the deterioration of output signal:
1) Developed a new filter material for improving the durability against poisoning substances which deteriorate the catalyst activity.
2) Optimized the structure and catalyst quantity of detector element for extending the lifetime
3) Adjusted the proportion of detector element to compensation element for elevating the output signal in fresh air over time.
Fig.1 shows the output voltage behavior of TGS6812, Figaro's catalytic combustion type gas sensor. Gradual increase of output voltage in gas in tandem with output voltage in fresh air enables a fail-safe design of gas detector. With its 10 years life expectancy, TGS6812 is adopted in wide range of gas detectors.
Another disadvantage of catalytic combustion type sensor, compared to other type sensors, is vulnerability against physical impact. It prevents catalytic combustion type sensors from being adopted in portable gas leak detectors.
For such applications, Figaro has been developing a catalytic combustion type MEMS gas sensor with low power consumption and excellent impact durability. It will also be introduced in the presentation.

Acknowledgements :