Level measuring device for electrically non-conductive liquids
US4795967A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Sep 11, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2540/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a level measuring device for electrically non-conductive liquids comprising a sensor which is positioned in a vessel and is in contact with the liquid, and further comprising an evaluation circuit connected to this sensor both compensation of a changing dielectric constant and a high degree of accuracy and resolution are achieved by placing a driver electrode 5 in the lower part of the vessel 1 at a position essentually coaxial to the sensor electrode 3, 4, and by placing a compensating electrode 6 between the driver electrode 5 and the wall 8 of the vessel 1, such that further capacitors are formed between the two electrodes 5 and 6 themselves as well as between them and the sensor electrode 3, 4 and between them and the wall 8 of the vessel 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.