Vibration meter and method of measuring a viscosity of a fluid

US7520162B2 · kind B2 · utility

Assignee

• Endress+Hauser Flowtec AG · CH

Inventors

• Alfred Wenger · Neftenbach, CH
• Michael Fuchs · Bad Wörishofen, DE
• Christian Matt · Lörrach, DE
• Wolfgang Drahm · Erding, DE

Key dates

• Filing date: Mar 7, 2006
• Grant date: Apr 21, 2009
• Expiry date: Mar 7, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N11/16
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A vibration meter and a method of measuring a viscosity of a fluid flowing through a pipe are disclosed. The vibration meter comprises meter electronics and a transducer assembly with an electromechanical excitation arrangement and with a flow tube which oscillates in operation. A sensor arrangement produces sensor signals representative of inlet-side and outlet-side deflections of the flow tube. An evaluation circuit derives from said sensor signals and from an excitation current generated by an excitation circuit for the excitation arrangement a viscosity value representative of the viscosity of the fluid.