Magnetic-inductive flowmeter
US4483201A · kind A · utility
Inventor
Key dates
| Filing date | Aug 2, 1982 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Aug 2, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/588
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic-inductive flowmeter is disclosed operating with an alternating field but supplied from a source of direct voltage. The inversion is executed with the aid of the excitation coils of the pickup as well as with the aid of a control circuit. In an advantageous embodiment, an oscillator circuit is formed with the aid of the excitation coils and a capacitor so that the power supplied by the source of direct voltage represents only a small portion of the apparent output of the excitation coil. Besides, the provision is made to keep the current through the control circuit and/or its amplitude, or the amplitude of the voltage at the excitation coil, at a constant value, so that the measuring signal is not subject to possible fluctuations of the direct voltage source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.