Method and apparatus for magneto-inductive flow measurement

Details Method and apparatus for magneto-inductive flow measurement Method and apparatus for magneto-inductive flow measurement

1997-05-23

1999-05-18

Dombroske, George

Measuring and testing

Volume or rate of flow

By measuring electrical or magnetic properties

G01F1/58

Patent

active

059052066

ABSTRACT:
Magneto-inductive flow measurement using a pulsed and/or reversing pulsed constant field wherein the measurement voltage which is induced by the flow, running transversely with respect to the magnetic field, of the measurement medium in the measurement tube of the magneto-inductive flowmeter is sampled in each clock time interval when the coil current is applied, even if the magnetic field has not yet reached its steady-state. Empirically determined correction values are used to correct the samples to the situation when measurements are carried out with a steady-state magnetic field. Calibration measured values can be recorded in a steady-state magnetic field from time to time, in order to check and, if required, to correct the correction factors. The coil current can be switched at frequencies which alternate with one another in time, the number of periods of the mutually alternating period sequences being varied in an irregular manner.

REFERENCES:
patent: 4159645 (1979-07-01), Cushing
patent: 4262543 (1981-04-01), Grebe, Jr. et al.
patent: 4370892 (1983-02-01), Schmoock
patent: 4704907 (1987-11-01), Mannherz
patent: 5325728 (1994-07-01), Zimmerman et al.

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