Abb Patent Gmbh

Abb Technology Ag

Hans-Werner Schwiderski

Paul Szasz

Ralf Huck

Albrecht Vogel

Dieter Keese

Wolfgang Scholz

Fabrizio Lorito

Dirk Huybrechts

Dominik Eifel

Eniet Asaah

Andreas Thone

Kai Hencken

Daniel Schrag

Harald Grothey

Marco Ehrenberg

Arno Erich Oehler

A method is disclosed for operating a flowmeter, such as an inductive flowmeter, in which a medium flows through a measuring tube, and an arrangement of electrodes are conductively connected to the medium. To determine a filling level in a simple and reliable manner, at least four electrodes are arranged in the measuring tube essentially in a half-circumferential region based on a cross section through the measuring tube. When at least one signal is fed in at one of the electrodes or at one of the electrode pairs, an electrical current is measured at an electrode or between an electrode pair. An electrical voltage is measured between at least one other electrode pair or with respect to a common connection to ground. When comparing measurements with two different electrode combinations, different voltage and current values are related to infer a diagnosis, such as a filling level in the tube, and/or an electrode coating, and/or an oblique installation, and/or a sedimentation at a bottom of the tube. The diagnosis can be used to correct a flow rate.

Method for operating a flowmeter

A magnetoinductive flow meter has an electromagnet unit which is mounted on an outside periphery of a measuring tube. The electromagnet unit can include magnetic flux-concentrating device and electric coils for generating a magnetic field which is oriented substantially perpendicular to the direction of flow of a measuring medium which flows through the measuring tube. The magnetic flux-concentrating device of the electromagnet unit can include ferrite pole cores each respectively associated with each one of the electric coils. A single magnet yoke composed of an electric sheet material can be connected to each ferrite pole core. The magnet yoke can surround the electric coils jointly in a clip-like manner.

Magnetoinductive flow meter having an electromagnet unit which includes combined magnetic flux-concentrating means

The invention relates to a special electrode surface for electrodes of a flow measuring device. In order to provide more measurement reliability for abrasive substances to be measured, for example in multiphase substances to be measured, according to the invention the size of the active electrode surface () is optimized independently of the size of the electrode () to be sealed in by means of a coating () so that an electrically nonconductive coating leaves free only the electrically active surface ().

Electrode with electrode surface for magnetically inductive flow meter

The invention relates to a magnetic-inductive measuring device for flowing substances with at least one subsystem respectively for carrying the substances, recording measuring signals through a signal pickup, generating a magnetic field through at least two exciting coils and a ferromagnetic core and bounding the measuring device on the ambient side of the housing. The measuring device is characterized in that at least one of the subsystems is entirely or partly formed by layers of fibre composite material and/or is embedded in layers of fibre composite material.

Magnetic-inductive measuring device for flowing substances and method for its production

The invention relates to a magnetic-inductive measuring device () for flowing substances (substance being measured), with a measuring tube () and a further subsystem respectively

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Noerten-Hardenberg, Germany

Hans-Werner Schwiderski