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Abstract

The characteristics of a gas controlled tubular heat pipe furnace, 65 cm long, 27 mm inner diameter, manufactured at the Ispra Establishment of the Joint Research Center of the European Community have been studied with regard to possible applications in precision thermometry. The working fluid was sodium, the buffer gas helium. Measurements of the stability, temperature distribution, and response to pressure changes were carried out mostly at about 900 degrees C using platinum resistance thermometers. The temperature was held constant by automatic pressure control to such a degree that the deviations from the mean did not exceed 2 mK for 3 days. The homogeneity attained was such that over a distance of almost 20 cm the temperature did not deviate from the mean by more than 5 mK. The temperature distribution was reproducible generally within 1 or 2 mK. The time constant of the temperature response to small pressure changes was less than one minute. The figures quoted are preliminary because they reflect the current measurement capabilities rather than the performance limits of the heat pipe, but they justify the statement that the heat pipe furnace does indeed meet the requirements for a precision high temperature thermostat.

Additional information

Authors: NEUBERT W, PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY);FUHRMANN H G, PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY);JESCHECK M PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY), PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY)
Bibliographic Reference: EUR 10180 EN (1985) MF, 42 P., BFR 150, BLOW-UP COPY BFR 210, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124066500 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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