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Reference data for thermocouple materials below the ice point.Standard thermoelectric data have been determined for four thermocouple combinations used below the ice point: commercial types E, K, and T and the special combination of KP vs Au-0.07 at.% Fe. Power series coefficients necessary to generate E = f(T) data for these combinations are given. In addition, extensive tests were carried out to ascertain the variability between materials from different manufacturers. Typical wires processed for low-temperature usage often have slightly thermoelectric properties (up to 1%) from those, nominally identical, wires made for high-temperature applications. Generally, type E is the most satisfactory standardized commercial combination. The Au-0.07 at.% Fe material has been examined in particular detail, because it is not yet an ISA standard material. It has excellent sensitivity in the liquid helium/liquid hydrogen temperature range and a nearly linear thermovoltage at higher temperatures.
Document ID
19730057229
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Sparks, L. L.
Powell, R. L.
(National Bureau of Standards, Institute for Basic Standards, Boulder Colo., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1972
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: Symposium on Temperature
Location: Washington, DC
Start Date: June 21, 1971
End Date: June 24, 1971
Accession Number
73A42031
Funding Number(s)
CONTRACT_GRANT: NASA ORDER R-45
Distribution Limits
Public
Copyright
Other

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