Expendable immersion thermocouple
AssigneeLeeds & Northrup Company
InventorRichard J. Hance
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Abstract
An expendable immersion thermocouple having a cup-shaped body member for supporting the thermocouple and providing a cavity into which a refractory cement is poured to secure the thermocouple in place. The refractory cement is nonhomogeneous and has a surface region which is substantially composed of a high temperature refractory material such as alumina.
Claims5
In the method of manufacture of an expendable immersion thermocouple having a thermocouple enveloped in a high temperature protective tube and secured in the face of a body member by a mass of refractory cement, the improvement comprising the step of forming within the exposed face of said refractory cement a zone of high temperature refractory material comprising alumina or magnesia.
In an expendable immersion thermocouple for the measurement of the temperature of molten metal having a thermocouple enveloped in a protective tube which projects from the face of a body member for contact with said molten material and in which said tube is secured in said body member by a mass of refractory cement including a mixture of refractory material having differing thermal characteristics and having a surface which also is exposed to said molten material when immersed, the improvement comprising a layer of high refractory material comprising alumina or magnesia within the exposed surface of said refractory cement.
Dependencies are inferred from the claim text.