Electromagnetic flowmeter with shielded electrodes

US3999443A · kind A · utility

Assignee

• Fischer & Porter GmbH · US

Inventors

• Eggert Appel · Dransfeld, DE
• Gottfried Geisler
• Wilfried Kiene · Menden, DE
• Albert Seebode

Key dates

• Filing date: Sep 29, 1975
• Grant date: Dec 28, 1976
• Expiry date: Sep 29, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/58
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electromagnetic flowmeter system capable of measuring fluids having any degree of conductivity, including fluids having dielectric properties. The fluid to be measured is conducted through a dielectrically-lined flow tube to intersect a transverse magnetic field produced by an electromagnet, thereby inducing a voltage in a pair of planar electrodes mounted within the dielectric lining, each electrode being provided with a driven shield. The electromagnet is excited by a direct voltage which is periodically interrupted to produce a periodic steady state field whereby unwanted in-phase and quadrature components are minimized.