Cryogenic Temperature Sealed Fixed Points: a New-Generation of Modular Cells at IMGC

Pavese, Franco; Ferri, D.; Peroni, I.; Pugliese, Andrea; Steur, P. P. M.; Fellmuth, B.; Head, D I; Lipiński, L.; Peruzzi, Andrea; Grzebyk, A. Szmyrka; Wolber, L.

doi:10.1063/1.1627120

Cited by 9 publications

(16 citation statements)

References 1 publication

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“…Samples of CO 2 are composed of the stable isotopes of 16 O, 18 O, 12 C and 13 C. The isotopic content of a given sample of CO 2 can vary to an extent that causes an isotopic effect on the CO 2 TP. However, unlike the reported terrestrial distributions of the isotopic ratios by the International Union of Pure and Applied Chemistry [24], commercial tank CO 2 gas has narrow distributions of the isotopic ratio X 18O of 18 O and X 13C of 13 C isotope [25,26].…”

Section: Effect Of Isotopementioning

confidence: 99%

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Realization of the triple point of carbon dioxide in a transportable cell using long-stem SPRTs

Yu¹,

Zhang²,

Feng³

et al. 2022

Metrologia

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The action of Minamata Convention requests in the near term to develop alternative fixed points to replace the mercury triple point (Hg TP) from the set of the defining points of the International Temperature Scale of 1990. The carbon dioxide (CO2) TP is one candidate that inherits the advantage of high chemical, physical stability and low health risk, and the disadvantage of a relative high pressure in room temperature. We report our study on the realization of the CO2 TP using long stem SPRTs. We present a novel design for CO2 TP cell of the thermometer immersion depth extending from 110 mm to 200 mm with no increase of sample gas pressure. The outer dimension of the new cell is proper for a drop-in compatible replacement of a normal cell for the Hg TP. We realized 14 plateaus of the CO2 TP using two long stem SPRTs in a span of 12 months. The mean temperature at the CO2 TP is 216.59130 (36) K at the melted fraction F=0.5 and 216.59136 (37) K at F=1.0. In the given uncertainties, the uncertainty arising from the transformation to ITS-90 contributes a major part of 0.29 mK to 0.30 mK. The uncertainty formed by the pressure head effect and the axial heat leak through thermometer well of the new cell, the impurities of the sample gas, the inaccuracy of the electronic instruments contribute a less part of 0.21 mK to 0.22 mK. The plateaus consistently exhibit small slopes of the height of less than 0.21 mK and the time spans from 147 hours to 347 hours between F=0.3 and F=0.75. The small slopes in the plateaus demonstrate the repeatability of 0.056 mK and 0.059 mK respectively for the melting fraction F=0.5 and 1.0, the long term stability of 0.031 mK.

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Section: Effect Of Isotopementioning

confidence: 99%

“…In the last quarter of a century, a number of researches were implemented on measurements of the CO 2 TP [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The results address the following specifics.…”

Section: Introductionmentioning

confidence: 99%

Realization of the triple point of carbon dioxide in a transportable cell using long-stem SPRTs

Yu¹,

Zhang²,

Feng³

et al. 2022

Metrologia

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“…The triple point of oxygen was realized in the IMGC cell no 202 3-IX-76, which was included in the EUROMET project 377 [7]. The cells were placed in an adiabatic cryostat as described in [8]. To realize the mercury and water triple points, cell Hg 220 and H 2 O cell B11/50/465 were used with their respective baths manufactured by ISOTECH.…”

Section: Measurements Performed At Intibsmentioning

confidence: 99%

“…The measurements performed for the CCT-K2.4 comparison at the triple points of equilibrium hydrogen, neon, oxygen and argon were carried out in a temperature-controlled adiabatic calorimeter with a multi-compartment "Improved M-Cell" of the latest generation, developed by the LNE-Cnam8 in the framework of the Multicells project [B.8]. The characteristics of the Improved M-Cells were studied and reported by LNE-Cnam and NMi-VSL [B.1].…”

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confidence: 99%

CCT-K2.4: NRC/INTiBS/LNE-Cnam trilateral comparison of capsule-type standard platinum resistance thermometers from 13.8 K to 273.16 K

et al. 2012

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A trilateral comparison of capsule-type standard platinum resistance thermometers is reported that links the INTiBS realization of the International Temperature Scale of 1990 to the results of the Consultative Committee for Thermometry Key Comparison 2 in the temperature range 13.8033 K to 273.16 K. The report also supplies evidence to support the revision of the LNE-Cnam uncertainties in the KCDB list of CMCs at the triple points of neon and hydrogen.1.

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“…Therefore, to ensure measurement comparability, the two laboratories have applied the procedures registered within their respective quality management systems, regularly employed to produce The TP cells constituting the Italian National Temperature Standard below 84 K are given with the serial numbers Ec1H2 for the TP of e-H2, Ec2Ne for the TP of Ne, Ec1O2 for the TP of O2 and Ec1Ar for the TP of Ar. The designation Ec refers to element (E) of type c, as developed during the so-called MULTICELLS project [15,16], the four cells being able to be mounted together on a copper block, allowing a further five thermometers to be put in direct thermal contact. With respect to the e-H2 and Ne cells, information is required regarding their isotopic composition: cell Ec1H2 contains 91.6 mol D / mol H [17] while cell Ec2Ne contains 0.093 36 mol 22 Ne / mol Ne and 0.002 649 mol 21 Ne / mol Ne [18].…”

Section: Introductionmentioning

confidence: 99%

Comparison of ITS-90 realizations from 13 K to 273 K between LNE-CNAM and INRIM

2020

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Since Key Comparison CCT-K2, only few comparisons as regards realizations of cryogenic fixed points have been carried out, either bilateral (three, of which one still pending) or multilateral (two trilateral). Since a forthcoming follow-up is unlikely, any bilateral comparison, apart from key comparisons, is most welcome to provide evidence of the continuing thermometric capabilities of the laboratories involved in the realization of the ITS-90. Not too long after the establishment in 2018 of the Joint Research Laboratory for Fluid Metrology "Evangelista Torricelli" between LNE-CNAM and INRIM, the two laboratories agreed to perform a bilateral comparison, involving all the cryogenic fixed points of the scale between 13.8033 K and 273.16 Kincluding the two hydrogen vapour-pressure temperatures-, required to cover the full platinum resistancethermometer range, as dealt with in section 3.3.1 of the text underlying the ITS-90. The results are reported here and show a substantial agreement within the combined uncertainties.

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Cryogenic Temperature Sealed Fixed Points: a New-Generation of Modular Cells at IMGC

Cited by 9 publications

References 1 publication

Realization of the triple point of carbon dioxide in a transportable cell using long-stem SPRTs

Realization of the triple point of carbon dioxide in a transportable cell using long-stem SPRTs

CCT-K2.4: NRC/INTiBS/LNE-Cnam trilateral comparison of capsule-type standard platinum resistance thermometers from 13.8 K to 273.16 K

Comparison of ITS-90 realizations from 13 K to 273 K between LNE-CNAM and INRIM

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