Magnet system for electromagnetic flowmeter

US4186600A · kind A · utility

Assignee

• Fischer & Porter GmbH · US

Inventors

• Eggert Appel · Dransfeld, DE
• Herbert Gehrke · Rosdorf, DE
• Wilfried Kiene · Menden, DE

Key dates

• Filing date: Oct 3, 1978
• Grant date: Feb 5, 1980
• Expiry date: Oct 3, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/588
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electromagnetic flowmeter in which a fluid to be metered is conducted through a flow tube formed of a non-magnetizable, weldable metal pipe having an insulating liner therein and provided with a pair of diametrically-opposed electrodes. The fluid passing through the tube intercepts a magnetic field to induce a signal in the electrodes indicative of flow rate. The magnetic field is established by a magnet system excited by a low-frequency alternating or pulsating current, the system including at least one solid core of ferromagnetic material about which is wound an excitation coil. The core has its inner face welded to the outer surface of the pipe to provide a highly stable magnet system.