Compensation Method Applied to Coriolis Mass Flow Metering

F. Koschmieder, H. Röck

Abstract

Coriolis mass flow meters (CMFM) are characterized by high accuracy and the ability to measure density and mass flow simultaneously. The sensitivity and zero point of the CMFM may change due to temperature gradients along the measuring pipe or mounting conditions. These changes have to be detected and corrected in order to as- sure high accuracy. A model based approach to estimate the zero point during normal operation and one-phase flow is presented. The approach exploits two characteristics of the measuring device: firstly the impact of mass flow upon the oscillation in the 2^nd mode when the 1^st mode is stimulated i.e. the operation principle of nearly all Coriolis mass flow meters and secondly the impact of mass flow upon the oscillation in the 1^st mode when the 2^nd mode is stimulated. Both of these characteristics are realized by compensation of Coriolis forces using MIMO-Phasor-Control.

Keywords

Coriolis, mass flow, sensitivity, zero point, phasor control

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DOI

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IMEKO TC

TC9 - Flow Measurement

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