| 摘要 |
PROBLEM TO BE SOLVED: To prevent erroneous detection which is to be caused by impulsive wave, accurately cope with the degree of damage of a house or the like which is caused by earthquake wave, and close an isolation valve. SOLUTION: When acceleration G detected by acceleration sensors S1, S2, S3 is at least first acceleration G11 (e.g. 80 gal) of a first level recognition means, a trigger is started. When a condition that the acceleration G is at least the first acceleration G11 (250 gal) of the first level recognition means within a first time W11 (e.g. 0.5 sec) of a first timer, and a condition that the number of times N of the acceleration G higher than or equal to second acceleration G13 (100 gal) of a second level recognition means within a second time W12 with a second timer after the first condition is at least a previously determined value N11 (e.g. 10 times) are satisfied, an isolation valve of a gas meter is closed. The second time W12 is, e.g. 1.5 sec.
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