Resistance thermometer

Details Resistance thermometer Resistance thermometer

G - Physics

01

K

G01K 7/16 (2006.01) G01K 7/18 (2006.01)

Patent

CA 2189197

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°C).

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