公开(公告)号：US20180045545A1

公开(公告)日：2018-02-15

申请号：US15556058

申请日：2016-02-15

Applicant: Endress + Hauser Flowtec AG

Inventor： Nikolai Fink ,  Frank Schmalzried ,  Wolfgang Drahm

IPC: G01F1/58

CPC classification number: G01F1/586 ,  G01F1/588

Abstract: A magneto-inductive flow measuring device for measuring the flow of a flowable medium is described. The flow measuring device includes a measuring tube, a pair of coils, which are arranged opposite one another on the measuring tube and which are designed to produce an alternating magnetic field, which can be turned on and off, and which extends essentially transversely to the longitudinal axis of the measuring tube, as well as a pair of permanent magnets, which are arranged opposite one another on the measuring tube and which are designed to produce a permanent magnetic field, which extends essentially transversely to the longitudinal axis of the measuring tube. Moreover, the flow measuring device includes one or more pairs of measuring electrodes arranged opposite one another on the measuring tube, of which one pair of measuring electrodes is designed, in the case of turned off alternating magnetic field, to tap a measurement voltage induced by the permanent magnetic field, and an evaluation unit, which is designed, in the case of turned off alternating magnetic field, to monitor the measurement voltage induced by the permanent magnetic field, at least in the case of a predefined change of the measurement voltage, to turn on the alternating magnetic field and, by means of the alternating magnetic field, to determine a measured value for the flow.

公开(公告)号：US20250044133A1

公开(公告)日：2025-02-06

申请号：US18717726

申请日：2022-11-22

Applicant: Endress+Hauser Flowtec AG

Inventor： Markus Rüfenacht ,  Frank Schmalzried ,  Michael Burger ,  Andrew Burg

IPC: G01F1/58

Abstract: A method for operating a magnetic inductive flowmeter wherein the flowmeter includes a measuring tube for guiding a flowable medium; at least two measuring electrodes for detecting a measurement voltage which is dependent on the flow velocity and induced in the medium; and a magnetic field-generating device having a coil system with at least one coil for generating a magnetic field passing through the measuring tube, includes determining a deviation σ of a reactance of the coil system or a deviation σ of a variable dependent on the reactance of the coil system from a desired value. Also disclosed is a magnetic inductive flowmeter.

公开(公告)号：US11193804B2

公开(公告)日：2021-12-07

申请号：US16494920

申请日：2018-02-28

Applicant: Endress+Hauser Flowtec AG

Inventor： Frank Schmalzried

IPC: G01F1/60 ,  G01F1/58

Abstract: The present disclosure relates to a method for operating a magnetoinductive flowmeter as well as to such a flowmeter, wherein a disturbance superimposed on a measurement signal is at least partially compensated for by negative feedback of the disturbance to the measurement signal.

公开(公告)号：US20230213367A1

公开(公告)日：2023-07-06

申请号：US17757469

申请日：2020-12-01

Applicant: Endress+Hauser Flowtec AG

Inventor： Frank Schmalzried ,  Heinz Rufer ,  Wolfgang Drahm ,  Thomas Küng

IPC: G01F1/58 ,  G01F1/60

CPC classification number: G01F1/588 ,  G01F1/60

Abstract: A method for operating a magnetically-inductive flowmeter, wherein the magnetically-inductive flowmeter includes: a measuring tube for guiding a flowable medium; at least two measuring electrodes for detecting a flow velocity-dependent measuring voltage induced in the medium; and a magnetic field-generating device for generating a magnetic field passing through the measuring tube, wherein the magnetic field-generating device includes a coil system with at least one coil, includes determining a deviation σ of a reactance of the coil system or of a variable dependent upon the reactance of the coil system from a desired value. A magnetically inductive flowmeter is also disclosed.

公开(公告)号：US20200271492A1

公开(公告)日：2020-08-27

申请号：US16494920

申请日：2018-02-28

Applicant: Endress+Hauser Flowtec AG

Inventor： Frank Schmalzried

IPC: G01F1/60 ,  G01F1/58

Abstract: The present disclosure relates to a method for operating a magnetoinductive flowmeter as well as to such a flowmeter, wherein a disturbance superimposed on a measurement signal is at least partially compensated for by negative feedback of the disturbance to the measurement signal.

公开(公告)号：US20180364081A1

公开(公告)日：2018-12-20

申请号：US16061269

申请日：2016-11-15

Applicant: Endress+Hauser Flowtec AG

Inventor： Nikolai Fink ,  Frank Schmalzried ,  Heinz Rufer ,  Wolfgang Drahm

IPC: G01F1/58 ,  G01F1/60

Abstract: The invention relates to a magneto-inductive flow measuring device for measuring flow velocity or volume flow of a medium in a pipeline as well as to a method for implementing the magneto-inductive flow measuring device. In such case, the remanent magnetic field of at least one permanent magnet is applied for flow monitoring and flow measurement, wherein the flow measurement is performed upon achievement of criteria.