Apparatus for establishing and/or monitoring a predetermined filling level in a container

US6236322A · kind A · utility

Assignee

• Endress+Hauser Inc. · DE

Inventors

• Sergej Lopatin · Lörrach, DE
• Helmut Pfeiffer · Steinen, DE
• Alexander Muller · Steinen, DE
• Volker Dreyer · Lörrach, DE
• Wolfgang Brutschin · Schopfheim, DE

Key dates

• Filing date: Sep 1, 1999
• Grant date: May 22, 2001
• Expiry date: Sep 1, 2019

Classification

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

Abstract

An apparatus for establishing and/or monitoring a predetermined filling level in a container is described, which apparatus can be used in a wide range of applications, that is to say in many different media, which apparatus comprises: a housing (1), an oscillating element for projecting into the container, a diaphragm (5), which is fixedly clamped into the housing (1) at its edge and to which the oscillating element is fastened, and an electromechanical transducer for exciting the diaphragm (5) to produce oscillations in dependence on a transmission signal (S) present at the transducer and for receiving and converting oscillations thereof into an electrical reception signal (E), in which a percentage interval between a resonant frequency f.sub.r and an antiresonant frequency f.sub.ar divided by the resonant frequency f.sub.r exceeds 20% when the oscillating element oscillates in air.