Abstract
Gas sensors are used in both domestic and commercial environments. In Japanese apartment buildings, installation of gas sensors is required by law, even though the sensor elements still need improvement. One problem was that sensors could not preferentially detect a specific gas. We have, however, developed three types of tin oxide gas sensors, namely, sintered, tin film and thick film types. The combined use of these three sensors and a microcomputer makes up a gas sensing and countermeasure system. The system preferentially detects leaking gases in ambient atmosphere and stops the gas leak by means of an electromagnetic valve. The kind of gas that is leaking is displayed on a CRT.
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