LEAKAGE DETECTOR FOR LIQUID IN TANK

Japanese Patent JP3805244

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PROBLEM TO BE SOLVED: To provide a leakage detector for a liquid in a tank, capable of easily and accurately detecting even a trace amount of leakage, without stopping the use of the tank.
SOLUTION: The detector is inserted into a tank and detects leakage of the liquid. Vertical measurement conduits 10 and 14 into which the liquid in the tank is guided are provided with a measurement pipe 10 and a measurement tubule 14, having 1/50 or less of a cross-sectional area of the measurement pipe, communicates with the measurement pipe and is positioned below the measurement pipe. The measurement tubule 14 is attached with a flow sensor 16 used for thermally measuring a flow rate of the liquid. A leakage detecting means 22 detects leakage of the liquid in the tank based on the flow-rate value measured by the sensor. The leakage detecting means issues a leakage detection signal if the flow-rate value measured with the sensor is larger than zero and smaller than the flow-rate value which is acquired when refilling the liquid in the tank or drawing the liquid from the tank.

JP01285642	SENSOR WITH CHARACTERISTIC DISPLAY AND CONTROLLER USING SAME SENSOR
WO/2001/018496	SEVERAL GAS FLOW MEASURING DEVICES AND SIGNAL PROCESSING METHODS
JP2002168670	THERMAL AIR FLOWMETER

Koike, Atsushi
Yamagishi, Kiyoshi
Takahata, Takayuki
Nakamura, Toshimi
Kawanishi, Toshiaki

JP2001000381756

May 19, 2006

December 14, 2001

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MITSUI MINING & SMELTING CO LTD

G01F1/696; G01M3/26; B65D90/50; B67D7/32; B67D7/78; G01F1/696; G01M3/26; B65D90/00; B67D7/32; B67D7/78; (IPC1-7): G01M3/26; B65D90/50; B67D5/32; B67D5/60; G01F1/696

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