Measuring transducer of vibration-type

US7665369B2 · kind B2 · utility

Assignee

• Endress+Hauser Flowtec AG · CH

Inventors

• Enio Bitto · Aesch, CH
• Alfred Rieder · Landshut, DE
• Christian Schutze · Basel, CH
• Michael Fuchs · Bad Wörishofen, DE
• Wolfgang Drahm · Erding, DE
• Michael Wiesmann · Freising, DE

Key dates

• Filing date: Dec 19, 2008
• Grant date: Feb 23, 2010
• Expiry date: Dec 19, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2009/006
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The measuring transducer includes: a measuring tube vibrating, at least at times, and serving for conveying medium to be measured; a counteroscillator, which is affixed to the measuring tube on an inlet-side, to form a first coupling zone, and to the measuring tube on an outlet-side, to form a second coupling zone; at least one oscillation exciter for driving at least the measuring tube; as well as at least one oscillation sensor for registering oscillations at least of the measuring tube. During operation, the measuring tube executes, at least at times and/or at least in part, bending oscillations about an imaginary bending oscillation axis, which imaginarily connects the two coupling zones with one another. The oscillation sensor includes a coil, especially a coil affixed to the counteroscillator, as well as, magnetically coupled with the coil, a permanent magnet, which is placed within a magnet cup composed at least partially of magnetically conductive material and which is held to a cup base, especially a cup base secured to the measuring tube. Additionally, it is provided in the measuring transducer of the invention that a cup wall of the magnet cup, especially an essentially …