Apparatus for measuring the flow of a fluid flowing through a measuring tube
US5450757A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1994 |
| Grant date | Sep 19, 1995 |
| Priority date | — |
| Expiry date | Aug 11, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/58
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring the flow of fluid through a substantially horizontal measuring tube includes coils for producing two states of a magnetic field in which the magnetic fields extend through the measuring tube in a horizontal plane. The magnetic field in a first state extends through a first horizontal plane which intersects the measuring tube in substantially the same direction on both sides of the horizontal plane and in a second state extends in substantially opposite directions on both sides of the first horizontal plane. A pair of electrodes arranged at the measuring tube senses displacement of changes in the fluid and an electrical circuit corrects the voltage Ur between the electrodes in the first state of the magnetic field by using the voltage Ug between the electrodes in the second state of the magnetic field to obtain an output signal substantially proportional to the flow of the fluid. The electrodes are located in a second horizontal plane which is offset relative to the first horizontal plane so that an unambiguous relation exists between the voltages Ug and Ur on the one hand and the flow of the fluid on the other hand. Furthermore, the relation is dependent …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.