| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure water level gauge which can measure a drift value, while leaving a water level measurement part under the water. SOLUTION: In the water level measurement part A fixed under the water, the atmospheric pressure is always applied to a pressurized body 6, a synthetic pressure that is the sum of the atmospheric pressure and the water pressure is applied to a pressurized body 7, quartz oscillators 3 and 4 oscillating by the inclination movement of a wobble plate 2 by the differential pressure are displaced, and the state in which the wobble plate 2 is provided with an equal pressure by the pressurized bodies 6 and 7 is used as the reference of the depth zero, in obtaining the depth of the water on the basis of the differential frequency signal outputted from the both quartz oscillators. Further, by switchably applying the synthetic pressure and the atmospheric pressure to the pressurized body 7 by a switching valve device 15, the measurement of the drift value can be performed in the state in which the water level measurement part A is fixed under the water. COPYRIGHT: (C)2004,JPO&NCIPI
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