Electromagnetic flowmeter
US5524493A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1995 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Apr 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F25/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic flow meter capable of measuring the flow of a fluid flowing through a conduit irrespective of whether the conduit is full with the fluid or not. 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 th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.