Method and device for determining the filling level of a medium in a container

US7209073B2 · kind B2 · utility

Assignee

• ENDRESS+HAUSER GMBH+CO.KG · DE

Inventors

• Dietmar Spanke · Steinen, DE
• Robert Lalla · Bad Kötzting, DE

Key dates

• Filing date: Feb 4, 2005
• Grant date: Apr 24, 2007
• Expiry date: Feb 4, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F23/2962
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to a method for determining the filling level of a medium in a container. A mixer that has at least one mixer blade and a mixer frequency (f<1>R</1>) is disposed in the container. Measuring signals are emitted at a predetermined measuring frequency (f<1>M</1>) towards the medium. The measuring signals reflected on the surface of the medium are received and evaluated by a run time method. The aim of the invention is to provide a device which allows for a reliable measurement of the filling level of a medium in a container provided with a mixer. To this end, the measuring frequency (f<1>M</1>) of the measuring signal having the mixer frequency (f<1>R</1>) of the mixer is synchronized (f<1>M</1>=n f<1>R</1>with n ε N) and that the measuring frequency (f<1>M</1>) is shifted by a defined phase (?) with respect to the mixer frequency (f<1>R</1>).