Title:
DEVICE FOR DETERMINING THE LEVEL OF A MEDIUM IN A CONTAINER
Document Type and Number:
WIPO Patent Application WO2001061286
Kind Code:
A3
Abstract:
The invention relates to a device for determining the level (F) of a medium (3) in a container (2) using a capacitive sensor (4). A voltage source which subjects the sensor (4) to a measuring frequency (fM) is provided, as is a measuring/evaluating circuit (6) which establishes the measured capacitance (CM), compares this to a predetermined capacitance value and provides the information concerning the level (F) of the medium (3) in the container (2). The aim of the invention is to increase the measuring sensitivity of a capacitive sensor (4) without increasing the sensitivity of the sensor to interfering signals. To this end, the measuring/evaluating circuit (6) has at least one inductance (L) which together with the measured capacitance (CM), forms a resonant circuit (7).
Inventors:
FLORENZ HANS-JOERG (DE)
WERNET ARMIN (DE)
WERNET ARMIN (DE)
Application Number:
PCT/EP2001/001439
Publication Date:
December 06, 2001
Filing Date:
February 09, 2001
Export Citation:
Assignee:
ENDRESS HAUSER GMBH CO (DE)
FLORENZ HANS JOERG (DE)
WERNET ARMIN (DE)
FLORENZ HANS JOERG (DE)
WERNET ARMIN (DE)
International Classes:
G01F23/26; (IPC1-7): G01F23/26
Foreign References:
| US5602333A | 1997-02-11 | |||
| DE19536199A1 | 1997-04-03 | |||
| FR1002740A | 1952-03-10 | |||
| US3199350A | 1965-08-10 |
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