Title:
METHOD FOR OPERATING A MAGNETIC-INDUCTIVE FLOWMETER
Document Type and Number:
WIPO Patent Application WO/2015/028105
Kind Code:
A8
Abstract:
The invention describes a method for operating a magnetic-inductive flowmeter with a magnetic field generation device for generating a magnetic field which permeates a flowing medium and with a measuring device for determining measured values which represent the field strength of the electrical field induced in the flowing medium by the magnetic field, wherein the magnetic field generation device comprises at least one electromagnet and a magnetic field conductor which is at least partially penetrated by the magnetic field, and the permeability of the magnetic field conductor is a non-linear function of the magnetic field strength. The invention specifies a method of the type described above in which the presence of a parasitic magnetic field is detected, specifically by virtue of the fact that the electromagnet is energized at least with a first current value and a second current value, the measuring device determines a first measured value when the electromagnet is energized with the first current value and determines a second measured value when the electromagnet is energized with the second current value, a first measured value pair is formed from the first current value and the first measured value and a second measured value pair is formed from the second current value and the second measured value, the correspondence of the measured value pairs and of the function of the permeability is determined, and the non-correspondence of the measured value pairs and of the function of the permeability is signalled, wherein the non-correspondence is at least partially caused by the presence of a parasitic magnetic field in the magnetic field conductor.
Inventors:
NEVEN JOSEF (FR)
Application Number:
PCT/EP2014/001268
Publication Date:
July 02, 2015
Filing Date:
May 12, 2014
Export Citation:
Assignee:
KROHNE MESSTECHNIK GMBH (DE)
International Classes:
G01F1/58; G01F25/00
Attorney, Agent or Firm:
GESTHUYSEN PATENT- UND RECHTSANWÄLTE (Huyssenallee 100, Essen, DE)
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