Method for operating an electromagnetic flowmeter and...

Details Method for operating an electromagnetic flowmeter and... Method for operating an electromagnetic flowmeter and...

2005-09-21

2010-11-23

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

Reexamination Certificate

active

07836779

ABSTRACT:
A method for operating an electromagnetic flowmeter and a flowmeter are provided. A measuring tube is provided with a coil arrangement for producing a magnetic field at right angles to the direction of flow. The direction of current flow in the coil arrangement is altered periodically, and the current is kept essentially constant in one period after a rise to a predetermined value. A voltage and/or a voltage derivative applied to the coil arrangement is determined and compared with a reference value. If this voltage does not fall below the reference value in a desired minimum time within a measurement period, an error message is emitted in order to indicate a fault. If the voltage falls below the reference value, it is ensured that the magnetic field is sufficiently stable and measured values for a voltage which can be tapped off at measurement electrodes are subject to an offset error.

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