Method for determining and/or monitoring filling of a product in a container

US6856142B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Herbert Schroth · Schopfheim, DE
• Ralf Reimelt · Freiburg (Elbe), DE
• Igor Getman · Lörrach, DE
• Stefan Burger · Birkenfeld, DE

Key dates

• Filing date: May 19, 2001
• Grant date: Feb 15, 2005
• Expiry date: Jul 22, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/284
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a device for determining and/or monitoring filling of a product or the position of the boundary surface between two media or phases in a container. The device comprises a signal generating unit that generates high-frequency measuring signals, an injection unit and a surface waveguide, wherein the measuring signals are injected into the surface waveguide by means of the injection unit and directed toward the filling product via the surface waveguide. The device also comprises a receiver/evaluation unit, which directly or indirectly determines filling of the product or the position of the boundary surface in the container during the running time of the measuring signals reflected on the surface or boundary surface of the filling product. The invention aims at providing a device which is configured in such a way that parasitic voltages are effectively diverted. This is achieved in that the surface waveguide is connected to a frame potential by means of a coupling.