| 摘要 |
PROBLEM TO BE SOLVED: To obtain a differential pressure type liquid level measuring apparatus in which an influence of a mixed gas of an air and a vapor of a liquid to be measured is excluded to temperature-correct and a zero level regulating function of the liquid level is incorporated. SOLUTION: The differential pressure type liquid level measuring apparatus comprises a liquid level measuring tube 3, a differential pressure sensor 6 for detecting a differential pressure Pd between the interior and the exterior of the tube 3, a temperature-correcting measuring tube 4, a temperature correcting pressure sensor 7 for detecting a differential pressure Pt between an interior and an exterior of the tube 4, thereby receiving the pressures Pd, Pt and preset various type settings, converting a mean temperature of the mixed gas in the tube 4, temperature-correcting the liquid level ha of a liquid tank 1, and calculating. In the apparatus, a predetermined small amount of a sealing liquid 2b substantially similar in a density, a vapor pressure characteristics or the like to the liquid 2 to be measured is sealed in the tube 4, taking the vapor and the temperature in the mixed gas into consideration, a liquid reservoir container 10 in which an upper part is opened and a bottom is sealed, is provided at a bottom of the tube 3, and a zero-level regulating function of the liquid level is incorporated. COPYRIGHT: (C)2003,JPO
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