Development of the Sealed-Type Triple-Point-of-Argon Cell for Long-Stem SPRT Calibration at KRISS

Yang, Inseok; Song, Chang Ho; Kang, Kwan Hyoung; Kim, Y. G.; Gam, Kee Sool

doi:10.1007/s10765-008-0428-7

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…In recent years, various approaches to the realisation of the triple point of argon have been proposed by other researchers [6,7] in order to overcome the above inconveniences. Furthermore, two different systems are now commercially available, one from Isotech and the other from Fluke.…”

Section: Introductionmentioning

confidence: 99%

Realisation of the triple-point of Argon: comparison between two devices

Lopardo,

Dematteis,

Steur

2024

Phys. Scr.

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A new cryostat for the realization of the triple-point of the argon (83.8058 K), a defining fixed point of the International Temperature Scale of 1990 (ITS-90), was acquired at Italian National Metrological Institute (INRiM). The new system, manufactured by Fluke, is intended to substitute the current National reference, a model developed at BNM-INM in the 1975. The main difference between the two system is in the way to control the temperature. In the BNM-INM device the temperature is controlled adjusting the pressure of liquid nitrogen bath, in the Fluke system instead, an electrical heater wrapped around the argon cell is used, following cryogenic practice. This paper describes the result of the direct comparison and shows typical phase transitions obtained with the two argon systems. Then, a complete uncertainty budget is evaluated for the new Fluke system and compared with the National standard.

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Section: Introductionmentioning

confidence: 99%

Realisation of the triple-point of Argon: comparison between two devices

Lopardo,

Dematteis,

Steur

2024

Phys. Scr.

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“…Several models of cryostat and systems for the calibration of SPRTs at the triple point of argon were built by different institutions [1][2][3][4][5][6] since more than thirty years. CSPRTs are calibrated in small sealed cells under good adiabatic conditions [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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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“…It is one of the most commonly used fixed points for calibration of standard platinum resistance thermometers (SPRTs) at low temperatures below 273.16 K [1]. In the past 20 years, a few argon apparatus for realization of the triple point of argon were developed by other researchers [2][3][4][5][6]. According to previous experimental and research experience, in order to calibrate SPRTs at the triple point of argon efficiently and accurately, the apparatus for realization of the triple point of argon should possess the following features: ease of operation for realization of the triple point of argon, simplicity of maintenance, long triple-point plateau, multiple re-entrant wells for calibration of several SPRTs in one plateau, good immersion profile of the re-entrant wells corresponding with ITS-90 theoretical values, uniform temperature distribution among re-entrant wells, and accurate triple-point plateau temperature.…”

Section: Introductionmentioning

confidence: 99%

Development of the Triple-Point-of-Argon System

Zhao¹,

Nerdrum²,

Meier³

2011

Int J Thermophys

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A triple-point-of-argon system was developed to realize the argon triplepoint temperature defined in the International Temperature Scale of 1990 (ITS-90) and to calibrate long-stem standard platinum resistance thermometers (SPRTs). The system structure, the techniques for realization of the triple-point temperature, and the testing results are presented in this paper. In this system, there is a central argon cell that includes four re-entrant wells with an immersion depth of 160 mm which can be used to calibrate four long-stem SPRTs simultaneously. A high-accuracy temperature controller is used to control the realization process of the argon triple-point temperature plateau. The argon triple-point plateau can be easily realized with this system. The influence of different experimental parameters on the triple-point-of-argon plateau was investigated and is discussed. The testing results show that the duration of the plateau can be over 100 h with the temperature change less than 0.05 mK. The temperature homogeneity of the four re-entrant wells was tested. The immersion profile of the system was measured, and the measurement results were compared with the ITS-90 hydrostatic values. The uncertainty analysis shows that the uncertainty of the argon system is 0.25 mK (k = 2).

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Development of the Sealed-Type Triple-Point-of-Argon Cell for Long-Stem SPRT Calibration at KRISS

Cited by 4 publications

References 3 publications

Realisation of the triple-point of Argon: comparison between two devices

Realisation of the triple-point of Argon: comparison between two devices

Argon Triple-Point Device for Calibration of SPRTs

Development of the Triple-Point-of-Argon System

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