The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 2004
Filed:
Feb. 10, 2003
i f m electronic GmbH, Essen, DE;
Abstract
A capacitive fill level measuring instrument includes a fill level sensor having several sensor arrays ( ), electrical lines ( ) connected to the sensor arrays ( ), select switches ( ) with multi-pole sides ( ) connected to the lines ( ), and a power supply and evaluation circuit ( ) having a power supply circuit ( ) and an evaluation circuit ( ) connected to the mono-pole sides of the select switches ( ). A measured value is determined for a state in which no sensor array ( ) is connected via the evaluation circuits ( ) and ( ), the sensor arrays ( ) are alternately connected to the multi-pole side ( ) of the first select switch ( ) and the multi-pole side ( ) of the second select switch ( ), and after a first fill level determination, the sensor arrays ( ), adjacent to a boundary layer, are triggered or interrogated, advantageously, solving various problems with background art devices.