Coriolis flowmeter

A Coriolis flowmeter having an improved measurement accuracy, especially in measurement applications, where conventional Coriolis flowmeter may have a reduced accuracy due to erroneous flow spiking or outputs during no-flow situations is described, comprising: a measurement tube ( 4 ), a driver ( 16...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: STEVENS JERRY E, LOGUE PAUL
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A Coriolis flowmeter having an improved measurement accuracy, especially in measurement applications, where conventional Coriolis flowmeter may have a reduced accuracy due to erroneous flow spiking or outputs during no-flow situations is described, comprising: a measurement tube ( 4 ), a driver ( 16 ) for imparting a force proportional to an applied excitation signal to the measurement tube ( 4 ) for setting the measurement tube ( 4 ) into an oscillatory motion, motion sensors ( 17, 18 ) for measuring the motion of the measurement tube ( 4 ), an excitation signal generator, for generating the excitation signal to be supplied to the driver ( 16 ) based on the measurement signals derived by the motion sensors ( 17, 18 ), means ( 20, 27 ) for monitoring the excitation signal or a damping-coefficient of a damping of the measurement tube ( 4 ) and for determining whether an amplitude (A) of the excitation signal or the damping coefficient exceeds an application-specific range, and means for determining a corrected flow (Fc) of a fluid through the measurement tube ( 4 ), wherein the corrected flow (Fc) is determined based on measurement signals derived by the motion sensors ( 17, 18 ), when the excitation signal or the damping coefficient has an amplitude, that lies within the application-specific range and wherein the corrected flow (Fc) is set to an application-specific flow, when the excitation signal or the damping coefficient has an amplitude, that exceeds the application-specific range.