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Concerning the stability of some base metal thermocouples (Chromel, Alumel, Nisil, Nicrosil, Ni, versus Pt)

J Ancsin

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Drift of emf in bare-wire, base metal thermocouples is linked to the precipitation of alloying components that supersaturate the host (Ni) lattice. Using a simple phenomenological description, one can visualize the process of precipitation from supersaturated solid solutions. Some possible reasons for the changes in alloy composition in metal sheathed thermocouples are suggested.


PACS

07.20.Dt Thermometers

41.20.Cv Electrostatics; Poisson and Laplace equations, boundary-value problems

64.75.-g Phase equilibria

64.70.D- Solid–liquid transitions

Subjects

Soft matter, liquids and polymers

Accelerators, beams and electromagnetism

Instrumentation and measurement

Condensed matter: structural, mechanical & thermal

Dates

Issue 2 (1996)



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