| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid level measuring device capable of measuring the liquid level of measuring object liquid using a simple constitution, without being influenced of measuring result due to fluctuations of the atmospheric pressure or the temperature. SOLUTION: The first pressure inlet path 13 is constituted of a cylindrical member having a blocked upper end and an opened lower end, and the lower end side is arranged in the inserted state into the measuring object liquid 3. The second pressure inlet path 14 is constituted of a cylindrical member, having the same shape and the same material as the first pressure inlet path 13. A reservoir container 11 is filled inside with reference liquid 4, which is the same liquid or liquid having approximately the same material as the measuring object liquid 3, and the lower end side of the second pressure inlet path 14 is arranged in the inserted state into the reference liquid 4. Differential pressure, between the inside of the first pressure inlet path 13 and the inside of the second pressure inlet path 14, is detected by a differential pressure sensor 18. Since each influence on the first pressure inlet path 13 and on the second pressure inlet path 14, exerted from fluctuation of the atmospheric pressure or the temperature is equal and each influence on the measuring object liquid 3 and on the reference liquid 4 is equal, each influence exerted from the atmospheric pressure or the temperature can be offset, and the liquid level of the measuring object liquid 3 can be measured by using a simple constitution. COPYRIGHT: (C)2007,JPO&INPIT
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