Construction and Start-up of a Large-Volume Thermostat for Dielectric-Constant Gas Thermometry |
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Authors: | A Merlone F Moro T Zandt C Gaiser B Fellmuth |
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Affiliation: | 1.Istituto Nazionale di Ricerca Metrologica (INRiM),Turin,Italy;2.Physikalisch-Technische Bundesanstalt (PTB),Berlin,Germany |
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Abstract: | A liquid-bath thermostat with a volume of about 800 L was designed to provide a suitable thermal environment for a dielectric-constant
gas thermometer (DCGT) in the range from the triple point of mercury to the melting point of gallium. In the article, results
obtained with the unique, huge thermostat without the DCGT measuring chamber are reported to demonstrate the capability of
controlling the temperature of very large systems at a metrological level. First tests showed that the bath together with
its temperature controller provide a temperature variation of less than ±0.5mK peak-to-peak. This temperature instability
could be maintained over a period of several days. In the central working volume (diameter—500mm, height—650mm), in which
the vacuum chamber containing the measuring system of the DCGT will be placed later, the temperature inhomogeneity has been
demonstrated to be also well below 1mK. |
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