In-line measuring devices and method for compensation measurement errors in in-line measuring devices

US7412903B2 · kind B2 · utility

Assignee

• Endress+Hauser Flowtec AG · CH

Inventors

• Alfred Rieder · Landshut, DE
• Wolfgang Drahm · Erding, DE
• Hao Zhu · Freising, DE

Key dates

• Filing date: May 18, 2006
• Grant date: Aug 19, 2008
• Expiry date: Jun 24, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F1/8436
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An inline measuring device comprises a vibratory-type transducer and a measuring device electronics electrically coupled with the vibratory-type transducer. The vibratory-type transducer includes at least one measuring tube being inserted into the course of a pipeline and serving for conducting a mixture to be measured. An exciter arrangement acting on the measuring tube for causing the at least one measuring tube to vibrate and a sensor arrangement sensing vibrations of the at least one measuring tube and delivering at least one oscillation measurement signal representing oscillations of the measuring tube. The measuring device electronics delivers an excitation current driving the exciter arrangement. Further, the inline measuring device electronics is adapted to produce a measured value representing the physical, measured quantity of the mixture to be measured. Therefor, the measuring device electronics estimates from the excitation current and from said at least one oscillation measurement signal a Coriolis coupling coefficient. This Coriolis coupling coefficient corresponds with an instantaneous coupling between a first natural eigenmode of the measuring tube currently driven …