Conclusions
It is advisable to keep in mind the possible variation of the thermocouple calibration characteristics at high temperatures. A certain stabilization of these characteristics can be obtained by a preliminary annealing of thermocouples at temperatures higher than their operating temperatures.
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Literature cited
A. G. Adakhovskii, A. N. Gordov, G. B. Lapp, Z. S. Lebedeva et al., Collection: Fused-Metal Temperature Measurements [in Russian] (Standartgiz, Moscow-Leningrad, 1960).
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S. K. Danishevsky, Collection: Rhenium [in Russian] (Izd. AN SSSR, Moscow, 1961), pp. 162–169.
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Lapp, G.B., Popova, D.I. Thermoelectric stability of thermocouples made of high-melting metals or their alloys. Meas Tech 8, 816–817 (1965). https://doi.org/10.1007/BF00981538
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DOI: https://doi.org/10.1007/BF00981538