Temperature sensor

US5959524A · kind A · utility

Assignee

• Heraeus Electro-Nite International N.V. · BE

Inventors

• Karlheinz Wienand · Aschaffenburg, DE
• Margit Sander · Karlstein, DE
• Stefan Dietmann · Haiterbach, DE
• Werner Englert · Alzenau, DE

Key dates

• Filing date: Mar 11, 1996
• Grant date: Sep 28, 1999
• Expiry date: Mar 11, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01K7/183
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a temperature sensor with a platinum resistance thermometer accommodated in a tube-shaped housing, the platinum resistance layer belonging thereto should be protected against pollution or contamination of the platinum, since the electrochemical characteristics of platinum can be reduced by substances in the surroundings in the event of too low a partial pressure of oxygen. For this purpose, a mechanically solid and liquid-impermeable, connection is provided in the connection region of the tube-shaped housing, which permits an admission of air-oxygen into the housing from the environment of the connecting cable. The air-oxygen admission is made possible through a liquid-impermeable oxygen-permeable jacket for the connecting cable and/or over an accompanying connecting plug, whereby the admission of air-oxygen takes place along a glass filament filler running parallel to the electrical leads inside the jacket of the connecting cable.