The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2019
Filed:
Apr. 20, 2015
Endress + Hauser Flowtec Ag, Reinach, CH;
Thomas Budmiger, Oberwil, CH;
ENDRESS + HAUSER FLOWTEC AG, Reinach, CH;
Abstract
An apparatus for measuring volume flow of a fluid flowing through a measuring tube in the direction of its longitudinal axis, comprising a coil arrangement, at least two measuring electrodes coupling with the fluid and a control/evaluation unit, which in connection with the coil arrangement produces a magnetic field periodically changing its polarity and extending essentially transversely to the longitudinal axis of the measuring tube. The control/evaluation unit during a measuring phase at an essentially constant magnetic field determines the volume flow of the fluid in the measuring tube based on a voltage induced in the measuring electrodes. The control/evaluation unit supplies the coil arrangement with an overvoltage during a delay phase, and the delay phase begins at the point in time of the reversal of the polarity of the magnetic field and ends at the point in time of the beginning of the measuring phase. The control/evaluation unit supplies the coil arrangement with an essentially constant holding voltage over the duration of the measuring phase, wherein the control/evaluation unit controls the ratio of overvoltage to holding voltage to an essentially constant value.