Abb Research Ltd.

Philippe Pr&ecirc;tre

Daniel A Matter

Thomas Kleiner

John Anthony Byatt

Anthony Byatt

Elias J&uuml;lke

A photoacoustic effect is used in order to measure a flow rate of a flowing medium (M), in particular of natural gas. A light emitter ( ) is used to produce in the medium (M) a sound wave (S) which is transmitted by the medium (M) and detected by a sound detector ( ). The light emitter ( ) is less exposed to the medium (M) than a diaphragm such as used in the ultrasonic method.

Flow meter

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.

Growing community of inventors

Baden-Dättwil, Switzerland

Philippe Prêtre

Growing community of inventors

Baden-Dättwil, Switzerland

Philippe Pr&ecirc;tre

Philippe Prêtre