Patent ID: 7536900
Filing Date: 2009-05-26
Classification: G01M

Abstract:
1. A leak detector for detecting leakage of liquid stored in a tank based on fluctuation in a level of the liquid, the tank including a top plate, a bottom plate, and a side plate connecting the top plate and the bottom plate, the leak detector comprising: a flow-rate measuring portion, provided near a bottom end of the leak detector, for measuring a flow rate between liquid in the tank and liquid retained within the leak detector; a bottom attaching portion provided at the bottom end of the leak detector to detachably attach the bottom end to the bottom plate; a top assembly, attached to the top plate so as to cover an opening provided in the top plate and having a through opening through which an upper end of the leak detector is supported in such a manner that the upper end of the leak detector is simultaneously movable relatively to the top plate in a direction substantially perpendicular to a surface of the liquid while the bottom end of the leak detector is detachably attached to the bottom plate; a liquid inlet/outlet portion near the bottom end through which the liquid flows in and out of the leak detector; a flow-rate measuring unit arranged near the liquid inlet/outlet portion inside the leak detector toward the upper end, and configured to measure an amount of flow of the liquid occurring through the liquid inlet/outlet portion; and a liquid retaining portion arranged between the upper end and the flow-rate measuring unit, and including a space configured to retain liquid that has flown therein through the liquid inlet/outlet portion; wherein the flow-rate measuring unit includes: