Modern Gas-Based Temperature and Pressure Measurements

Pavese, Franco; Beciet, Gianfranco Molinar Min

doi:10.1007/978-1-4419-8282-7

Cited by 24 publications

(30 citation statements)

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“…The discrepancy between the measured heat of transition and the expected one based on the quantity of enclosed substance was about 35 J. Also, the thermal resistance R CS for F ≈ 50 % (where F is the percentage of the molten argon) between the solid argon and a wall of the cell was estimated using the heat pulse method [12]. The temperature inside the cell before and after the heat pulse was measured.…”

Section: Resultsmentioning

confidence: 99%

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Argon Triple-Point Device for Calibration of SPRTs

Kołodziej¹,

Manuszkiewicz²,

Szmyrka-Grzebyk³

et al. 2014

Int J Thermophys

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This paper presents an apparatus for the calibration of long-stem platinum resistance thermometers at the argon triple point (T 90 = 83.8058 K), designed at the Institute of Low Temperature and Structural Research, Poland (INTiBS). A hermetically sealed cell filled at the Istituto Nazionale di Ricerca Metrologica, Italy with high purity gas (6N) is the main element of this apparatus. The cell is placed in a cryostat fully immersed in liquid nitrogen. A temperature-controlled shield ensures the quasi-adiabatic condition needed for proper realization of the phase transition. A system for correcting the temperature distribution along the thermometer well is also implemented. The cell cooling and argon solidification is carried out by filling the thermometer well with liquid nitrogen. A LabVIEW computer program written at INTiBS automatically controls the triple-point realization process. The duration of a melting plateau in the apparatus lasts for about 24 h. The melting width for F between 20 % and 80 % was <0.3 mK. The reproducibility of the plateau temperature is better than ±20 µK.

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Section: Resultsmentioning

confidence: 99%

“…It was filled at INRIM with the argon mentioned before and permanently sealed using an INRIM pinch-weld technique [11].…”

Section: Argon Cellmentioning

confidence: 99%

Argon Triple-Point Device for Calibration of SPRTs

Kołodziej¹,

Manuszkiewicz²,

Szmyrka-Grzebyk³

et al. 2014

Int J Thermophys

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“…The heat-pulse method was applied for determination of the melting curves [5]. This method is based on applying heat pulses of known energy to the cell.…”

Section: Methodsmentioning

confidence: 99%

Comparison of the Argon Triple-Point Temperature in Small Cells of Different Construction

et al. 2017

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The argon triple point (T 90 = 83.8058 K) is a fixed point of the International Temperature Scale of Preston-Thomas (Metrologia 27:3, 1990 Springer, New York, 2013). The Institute of Low Temperature and Structure Research has in its disposal a few argon cells of various constructions used for calibration of capsule-type standard platinum resistance thermometers (CSPRT) that were produced within 40 years. These cells differ in terms of mechanical design and thermal properties, as well as source of gas filling the cell. This paper presents data on differences between temperature values obtained during the realization of the triple point of argon in these cells. For determination of the temperature, a heat-pulse method was applied (Pavese and Beciet in Modern gas-based temperature and pressure measurement, Springer, New York, 2013). The comparisons were performed using three CSPRTs. The temperatures difference was determined in relation to a reference function W (T ) = R(T 90 )/R(271.16K) in order to avoid an impact of CSPRT resistance drift between measurements in the argon cells. Melting curves and uncertainty budgets of the measurements are given in the paper. A construction of measuring apparatus is also presented in this paper.

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“…The pressure corrections at 3 K are typically equivalent to the following corrections in temperature for the density of 168 mol · m −3 : 0.5 mK for the aerostatic pressure head, 0.1 mK for the thermomolecular pressure difference, 1.6 mK for the dead-space volume, and less than 0.1 mK for the thermal expansion and the pressure dilatation. The effects of the adsorption of the working gas and impurities in the working gas are included in the uncertainties on the basis of discussions in the literature [4,30].…”

Section: Methodsmentioning

confidence: 99%

Constant-Volume Gas Thermometry with Different Helium-3 Gas Densities at NMIJ/AIST

et al. 2011

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Constant-volume gas thermometer (CVGT) measurements are conducted using 3 He of three different densities as the working gas to obtain the thermodynamic temperature T CVGT and the second virial coefficient of 3 He, B, at temperatures down to 3 K, using the triple point of Ne as a reference temperature. Densities of 127 mol · m −3 and 278 mol · m −3 are used in addition to the density of 168 mol · m −3 used in the measurement reported previously, where T CVGT was obtained using the virial coefficient adopted by the International Temperature Scale of 1990 (ITS-90), B ITS-90 . T CVGT is obtained by two methods, by the single-and multi-isotherm fitting of B to the three densities and by the method used in the previous work using one of the three densities and B ITS-90 . B obtained from the isotherm fitting agrees with B ITS-90 within the uncertainty of the data used to derive B ITS-90 . Moreover, B obtained from a multi-isotherm fit agrees with that of recent theoretical ab initio calculations within 0.05 cm 3 · mol −1 at 5 K and above, and within 0.3 cm 3 · mol −1 down to 3 K. The values of T CVGT obtained from the multi-isotherm fits assuming different forms for the temperature dependence of B agree with each other within 0.1 mK. T CVGT obtained from the multi-isotherm fitting agrees with that obtained from the method in the previous report within 0.22 mK. The tendency of the difference between T CVGT and the ITS-90 temperature reported in the previous work is confirmed in the present work.

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Modern Gas-Based Temperature and Pressure Measurements

Cited by 24 publications

References 0 publications

Argon Triple-Point Device for Calibration of SPRTs

Argon Triple-Point Device for Calibration of SPRTs

Comparison of the Argon Triple-Point Temperature in Small Cells of Different Construction

Constant-Volume Gas Thermometry with Different Helium-3 Gas Densities at NMIJ/AIST

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