Capacitive filling-level sensor with dielectric coating
US6405590B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Aug 14, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/265
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention discloses a capacitive filling-level sensor, which is suitable in particular for filling-level determination in oil separator tanks. The capacitive sensor includes a measuring probe with at least one sensor electrode. According to the invention, the measuring probe is at least partially sheathed with at least one outer layer of a fluorinated plastic and at least one inner layer of a mica-filled plastic. Important exemplary embodiments concern an outer layer of perfluoroethylene-perfluoropropylene copolymer (FEP), an inner layer of mica-coated glass fiber tape impregnated with epoxy resin and possibly silanized and an incompressible, thermally adapted filling of the measuring-probe pipe with silicone oil and glass spheres or glass polyhedrons and/or an inner rod of AlMgSi-filled epoxy resin. The sheathing is electrically insulating, chemically inert, hydrophobic, oleophobic, waterproof, mechanically robust and easy to produce.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.