Fill-level measuring device

US9829367B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Helmut Pfeiffer · Steinen, DE
• Benjamin Mack · Lörrach, DE

Key dates

• Filing date: Mar 19, 2013
• Grant date: Nov 28, 2017
• Expiry date: Apr 25, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/2967
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A fill-level measuring device having an oscillatory system, which has at least one external, tubular, oscillatory element and an inner oscillatory element. The outer oscillatory element at least sectionally coaxially surrounds the inner oscillatory element. In an inner space of the inner oscillatory element, a compensation apparatus shiftable in the axial direction and having at least a first locking element, a second locking element and a coupling element is arranged. The locking elements and the coupling element are composed of piezoelectric material, wherein the coupling element, the first locking element and the second locking element are connected with one another, and wherein the first locking element and the second locking element in a resting state are each connected by force interlocking, e.g. friction interlocking, with a wall of the inner space, and the fill-level measuring device has an electronics unit, which is embodied to position the compensation apparatus at a predeterminable position by means of electrical signals.