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1. (WO2015047567) MAGNETIC FLOWMETER WITH SATURATION DETECTION AND/OR PREVENTION

Pub. No.:    WO/2015/047567    International Application No.:    PCT/US2014/050673
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Wed Aug 13 01:59:59 CEST 2014
IPC: G01F 1/60
Applicants: ROSEMOUNT INC.
Inventors: FOSS, Scot, Ronald
ROVNER, Bruce, David
DREIER, Jared, James
Title: MAGNETIC FLOWMETER WITH SATURATION DETECTION AND/OR PREVENTION
Abstract:
A magnetic flowmeter (20) for measuring flow of a process fluid in a pipe (22) includes a magnetic coil (26) disposed adjacent to the pipe (22) configured to apply a magnetic field to the process fluid. First and second electrodes (30, 32) are disposed within the pipe (22) and electrically coupled to the process fluid and configured to sense an electromotive force (EMF) induced in the process fluid due to the applied magnetic field and flow of the process fluid. Input circuitry (148, 150) is coupled to the first and second electrodes (30, 32) and provides an output related to the sensed EMF. Diagnostic circuitry (212) coupled to the input circuitry (148, 150) is configured to identify a saturation related condition and responsively provide a diagnostic output (204). In another embodiment, saturation prevention circuitry prevents saturation of the input circuitry.