Fixed point cell for connection with the thermometer...

Thermal measuring and testing – Thermal calibration system – By immersion in liquid having controlled temperature

Reexamination Certificate

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C374S001000

Reexamination Certificate

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07063457

ABSTRACT:
A fixed-point cell for connection with a thermometer protecting tube and apparatus for estimating the lifetime of thermometerin the thermometer protecting tube including: a reference temperature material layer made of high-purity metallic materials to indicate a reference temperature based on a phase change of material, which coexists in a two-phase or three-phase state; a container part of a multiple structure having the reference temperature material layer embedded and sealed therein for achieving thermal correlation between the reference temperature material layer and the thermometer protecting tube having a thermometer contained therein, the thermometer protecting tube being inserted into the central hole of the fixed-point cell while being in contact with the inner circumference of the container part; and fixing devices disposed on the top portion of the container part for fixing the thermometer protecting tube to the container part in a fastening manner.

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Megharfi et al., “Realization of Open Copper Fixed-Point Cells for Thermocouple Calibration”, AIP-Conference Proceedings (USA), No. 684, Pt. 1, pp. 255-259, 2003.
Edler et al., “A cobalt-carbon eutectic fixed point for the calibration of contact thermometers at temperatures above 1100 C”, Metrologia (UK), vol. 42, No. 4, pp. 201-207, Apr. 26, 2005.
Mangum et al., “Comparisons of some NIST fixed-point cells with similar cells of other standard laboratories”, Metrologia, vol. 33, No. 3, pp. 215-225, 1996.
Article: Small Fixed-Point Cells For Use In Dry Well Block Calibrators G. F. Strouse—Proceedings 8thInternational Symposium on Temperature and Thermal Measurements in Industry and Science, pp. 783-788, Jun. 19-21, 2001, Berlin, Germany.

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