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Construction and Start-up of a Large-Volume Thermostat for Dielectric-Constant Gas Thermometry

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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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Authors and Affiliations

  1. Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 73, 10135, Turin, Italy

    A. Merlone & F. Moro

  2. Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587, Berlin, Germany

    T. Zandt, C. Gaiser & B. Fellmuth

Authors
  1. A. Merlone
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  2. F. Moro
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  3. T. Zandt
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  4. C. Gaiser
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  5. B. Fellmuth
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Correspondence to A. Merlone.

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Merlone, A., Moro, F., Zandt, T. et al. Construction and Start-up of a Large-Volume Thermostat for Dielectric-Constant Gas Thermometry. Int J Thermophys 31, 1386–1395 (2010). https://doi.org/10.1007/s10765-010-0708-x

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  • DOI: https://doi.org/10.1007/s10765-010-0708-x

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