Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Patent
1994-04-22
1997-04-29
Chilcot, Richard
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
7386111, 7386116, G01F 158
Patent
active
056251556
ABSTRACT:
An electromagnetic flow meter capable of measuring the flow of a fluid flowing through a conduit irrespective of whether the conduit is full of the fluid. A ratio of the output of a sensor disposed on the side of the conduit and obtained when a coil disposed above the conduit is energized to the output of the sensor obtained when a coil disposed below the conduit is energized is always a function of only the level of the fluid in the conduit. Therefore, if a first relationship between the ratio and the level of the fluid is beforehand obtained for a reference conduit, the level can be specified even if a gradient of the conduit changes. Since the level and flow are in a one-to-one relationship in the reference conduit, a second relationship between the sensor output and flow or level of the fluid obtained when the upper coil is energized, should beforehand be obtained. If the ratio is obtained for the measured conduit, the level of the fluid is determined. The flow in the reference conduit and the output at the level are obtained from the second relationship. Thus, the sensitivity=the output/the flow at that level is obtained. This sensitivity does not change as long as the level is constant. Thus, the sensitivity in the measured conduit is obtained. The flow of the fluid of interest is obtained by multiplying the sensitivity by the measured output for the measured conduit.
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Aichi Tokei Denki Co., Ltd.
Chilcot Richard
Dougherty Elizabeth L.
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