| 摘要 |
PROBLEM TO BE SOLVED: To provide a leakage sensing apparatus of which the sensing precision is hardly reduced even when wind is present in a ground atmosphere in the case that a vent tube is connected to a tank neck part. SOLUTION: The apparatus comprises both a main body part 3 and the neck part 5 connected to its upper part for sensing the leakage of a liquid L from a tank 1, which is housed in the main body part 3 of the tank 1 in which one end of the vent tube 51 is connected to the neck part 5 for communicating with outside. The apparatus includes a measuring capillary tube through which the liquid L in the tank 1 is introduced to and discharged from a lower end, a measuring tube having a larger cross-sectional area than that of the measuring capillary tube and connected to the upper end of the measuring capillary tube, and a flow sensor part attached to the measuring capillary tube for measuring the quantity of flow of the liquid through the measuring capillary tube. The apparatus further includes a communicating hole 17a located inside the tank main body part 3 for making an internal space of the measuring tube and an internal space of the tank 1 outside the measuring tube communicate with each other. The communicating hole 17a is arranged in a region higher than the lower 90% of the capacity of the internal space of the tank main body part 3 and lower than its 100%. COPYRIGHT: (C)2006,JPO&NCIPI
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