Electrical resistors – Resistance value responsive to a condition – Ambient temperature
Patent
1996-09-26
1998-11-03
Gellner, Michael L.
Electrical resistors
Resistance value responsive to a condition
Ambient temperature
338 22R, 338 22SD, H01C 304
Patent
active
058315128
ABSTRACT:
A resistance thermometer has a measuring resistor in the form of a resistance layer essentially made of a metal of the platinum group, preferably of platinum, laid on an electrically insulating surface of a carrier having a thermal expansion coefficient in the range 8.5 to 10.5 ppm/K range, and is provided with an electrically insulating cover layer. The carrier for the resistance layer can be constructed in the following manner: (a) as a substrate of a material containing a magnesium compound, preferably magnesium titanate; (b) as an intermediate layer mounted on a substrate, wherein the material of the substrate contains at least one magnesium compound; or (c) as an intermediate layer mounted on a substrate, wherein the substrate comprises aluminum oxide. With the resistance thermometer it is possible to attain a high long-term stability in the upper temperature range (above 500.degree. C.).
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Dietmann Stefan
Soll Eva
Wienand Karlheinz
Easthom Karl
Gellner Michael L.
Heraeus Sensor-Nite GmbH
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