Liquid level meter

US6229476A · kind A · utility

Assignee

• Endress+Hauser Inc. · DE

Inventors

• Wolfram Lutke · Inzlingen, DE
• Joachim Neuhaus · Steinen, DE
• Ralf Reimelt · Freiburg (Elbe), DE
• Werner Thoren · Lübeck, DE

Key dates

• Filing date: Nov 22, 1999
• Grant date: May 8, 2001
• Expiry date: Nov 22, 2019

Classification

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

Abstract

A liquid level meter is provided for measuring a level of a liquid (1) in a container (3), which meter measures acceptably in the case of liquids with low dielectric constants, and the installation and maintenance of which are simple and cost effective. This meter comprises an electronic circuit (13), which generates electromagnetic signals in operation, a conductor (7), which projects into the container (3), along which a float (11, 11a, 11b, 11c, 11d, 11e) moves along with the level, which has at least one segment reflecting electromagnetic signals, an injector (9), which transmits the signals from the circuit (13) to the conductor (7), which conductor (7) leads the signals into the container (3) and leads out a signal reflected at the float (11) and a receiving and evaluating circuit (15), which receives the reflected signals, which determines a travel time of the signals and which ascertains the level from the travel time.