Method for operating a magnetic-inductive flowmeter with improved compensation of the interfering voltage

US9599494B2 · kind B2 · utility

Assignee

• KROHNE Messtechnik GmbH · DE

Inventors

• Attila Bilgic · Tauberbischofsheim, DE
• Helmut Brockhaus · Dinslaken, DE
• Josef Neven · Persan, FR
• Christoph Spiegel · Oberhausen, DE

Key dates

• Filing date: Sep 25, 2014
• Grant date: Mar 21, 2017
• Expiry date: Jan 16, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/60
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Method for operating for measuring the flow velocity of a flowing medium using a measuring device in which a magnetic field is induced in the flowing medium and on which a interference voltage is superimposed. During compensation measuring, a first magnetic flux density is generated in the medium and a first measuring voltage determined, a second magnetic flux density is generated in the medium and a second measured voltage determined, and a third magnetic flux density is generated in the medium and a third measured voltage determined. The flow velocity is determined from the first and second magnetic flux densities and measured voltages, and the interference voltage is determined form the third magnetic flux density and measured voltage and the determined flow velocity. Then, a fourth measured voltage is determined, and the flow velocity re-determined from the third magnetic flux density, the fourth measured voltage and the determined interference voltage.