Electrical resistors – Resistance value responsive to a condition – Ambient temperature
Patent
1996-03-11
1999-09-28
Donovan, Lincoln
Electrical resistors
Resistance value responsive to a condition
Ambient temperature
338 25, 338229, H01C 710
Patent
active
059595248
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.
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Dietmann Stefan
Englert, deceased Werner
Sander Margit
Wienand Karlheinz
Donovan Lincoln
Easthom Karl
Heraeus Electro-Nite International N.V.
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