Filling level measuring device operating with microwaves, having an insert composed of a dielectric, and process for producing the dielectric

US6417748B1 · kind B1 · utility

Assignee

• Endress+Hauser Inc. · DE

Inventors

• Sergej Lopatin · Lörrach, DE
• Rolf Schwald · Schopfheim, DE
• Alexander Hardell · Lörrach, DE

Key dates

• Filing date: Nov 25, 1998
• Grant date: Jul 9, 2002
• Expiry date: Nov 25, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2709/02
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A description is given of a filling level measuring device operating with microwaves, having a housing and an insert composed of a dielectric, and of a process for producing the dielectric, in which the dielectric constant of the insert is adjustable and in which the insert has a high chemical resistance and a mechanical strength adequate for industrial applications. The dielectric is a composite material composed of a fluoroplastic, in particular polytetrafluoroethylene, and ceramic and is produced by mixing powdered ceramic and powdered fluoroplastic, drying the mixture, pressing the mixture and sintering the pressed mixture.