CPC G01F 1/588 (2013.01) [G01F 1/58 (2013.01)] | 9 Claims |
1. A method for operating a magneto-inductive flowmeter,
wherein the magneto-inductive flowmeter has a measuring tube for conducting a flowable medium, at least two measurement electrodes for detecting a flow-velocity-dependent measurement 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 has a coil;
comprising the method steps:
applying a control voltage to the coil in order to generate a change in the coil current over time; and
determining the change in the coil current over time in a change-over region,
wherein, in the change-over region, a change in the coil current is present until a target coil current I_target is reached;
wherein the change-over region comprises a γ time range (γ),
wherein the change in the coil current over time in the γ time range (γ) is determined,
wherein the γ time range (γ) is immediately followed by a δ time range (δ), in which the change in the coil current has an opposite sign to the change in the coil current in the γ time range (γ);
wherein the γ time range (γ) has a γ time range start (T_(γ start)),
wherein, in the γ time range start (T_(γ start)), a value of the coil current is at least 75% of a value of the target coil current I_target.
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