Intercomparison of the Realization of the ITS-90 at the Freezing Points of Al and Ag among European NMIs

Heyer, Dieter; Noatsch, U.; Tegeler, E.; Anagnostou, M.; Turzo-Andras, E.; Antonsen, I.; Augevicius, V.; Bojkovski, Jovan; Bronnum, A.; Chimenti, V.; Ďuriš, Stanislav; Filipe, Eduarda; Gaita, S.; Gray, J.; Head, D I; Grudniewicz, E.; Ivarsson, Jan; Kalemci, M.; Kerkhof, O.; Lobo, Iarley P.; Németh, S. Z.; Pokhodun, A. I.; Ranostaj, J.; Renaot, E.; Rosenkranz, P. W.; Šmíd, Marek; Steur, P. P. M.; Steiner, Anton; Valin, M. H.; Veliki, Tomislav; Weckström, T.

doi:10.1007/s10765-007-0283-y

Cited by 8 publications

(7 citation statements)

References 4 publications

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“…The difference between measurements made at VSL and MIRS/UL-FE/LMK was −1.7 mK, with an uncertainty of 4.2 mK. Furthermore, the difference between laboratories established during the EURA-MET 820 (T.K4) [3] intercomparison was −2.73 mK with an uncertainty of 5.70 mK, as shown in Fig. 3.…”

Section: Results and Linkage To Euramet 820 (Tk4)mentioning

confidence: 85%

“…On the graph, the actual measurements at the freezing point of aluminum at each phase of the bilateral comparison can be seen together with their uncertainties. The detailed budget of uncertainties is presented in Table 2 [3]. During the bilateral comparison, the change of resistance value of the used SPRT at the triple point of water can be seen in Fig.…”

Section: Results and Linkage To Euramet 820 (Tk4)mentioning

confidence: 99%

“…The most important are EURAMET (at the time of comparison, the name of the RMO was EUROMET) Project Number 552-comparison of the realizations of the ITS-90 over the range 83.805 8 K to 692.677 K (EURAMET.T.K3) [2] and Project Number 820-comparison of the realizations of the ITS-90 at the freezing points of Al (660.323 • C) and Ag (961.78 • C) (EURAMET.T.K4), [3]. Both VSL and MIRS/UL-FE/LMK participated in EURAMET comparisons.…”

Section: Introductionmentioning

confidence: 99%

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Bilateral Comparison of Aluminum Fixed-Point Cells Using Standard Platinum Resistance Thermometer

Bojkovski

Peruzzi²,

Bosma³

et al. 2011

Int J Thermophys

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The objective of Project EURAMET 1114 (Bilateral comparison of a freezing point of aluminum) in the field of thermometry is to compare realization of a freezing point of aluminum (660.323 • C) between the Dutch national laboratory VSL and the Slovenian national laboratory MIRS/UL-FE/LMK using a long-stem 25 standard platinum resistance thermometer (SPRT). Both laboratories had participated in a number of inter-comparisons on the level of EURAMET and also on BIPM CCT level (VSL). MIRS/UL-FE/LMK laboratory recently acquired a new fixed-point cell which had to be validated in the process of intercomparison. A quartz-sheathed SPRT was selected and calibrated at MIRS/UL-FE/LMK at the aluminum freezing point and at the water triple point. A second set of measurements was made on the same SPRT and at the same fixed points at VSL (NL). After its return, the SPRT was again recalibrated at MIRS/UL-FE/LMK. In the comparison the W value of the SPRT was used. The results of the internal and external intercomparisons confirmed that the new aluminum cell of the MIRS/UL/FE-LMK realizes a temperature that agrees with the VSL aluminum fixed point within the uncertainty limits of both laboratories. Furthermore, the results of this bilateral-comparison were compared with results that both laboratories achieved in the EURAMET K4 (Project 820) and were found to be in agreement.

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Section: Results and Linkage To Euramet 820 (Tk4)mentioning

confidence: 85%

Section: Results and Linkage To Euramet 820 (Tk4)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bilateral Comparison of Aluminum Fixed-Point Cells Using Standard Platinum Resistance Thermometer

Bojkovski

Peruzzi²,

Bosma³

et al. 2011

Int J Thermophys

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“…The current uncertainty budget for the calibration of SPRTs in the range from the mercury triple point to the aluminum freezing point is presented in Table 1. As can be seen from the uncertainty budget for the calibration of SPRTs at the aluminum freezing point, presented in Table 2 for Euromet Project 820 [4], the limiting factor is the uncertainty due to the DC/AC current, which is affected by the available power source. The laboratory is located where an ever-growing number of nonlinear electrical loads (such as computers, air conditioning systems, etc.)…”

Section: Measurement Techniques and Uncertaintiesmentioning

confidence: 99%

Realization of the Temperature Scale in the Range from 234.3 K (Hg Triple Point) to 1084.62°C (Cu Freezing Point) in Croatia

2008

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This article describes the realization of the International Temperature Scale in the range from 234.3 K (mercury triple point) to 1084.62 • C (copper freezing point) at the Laboratory for Process Measurement (LPM), Faculty of Mechanical Engineering and Naval Architecture (FSB), University of Zagreb. The system for the realization of the ITS-90 consists of the sealed fixed-point cells (mercury triple point, water triple point and gallium melting point) and the apparatus designed for the optimal realization of open fixed-point cells which include the gallium melting point, tin freezing point, zinc freezing point, aluminum freezing point, and copper freezing point. The maintenance of the open fixed-point cells is described, including the system for filling the cells with pure argon and for maintaining the pressure during the realization.

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“…Over the past 20 years, the reliability and performance of HTSPRTs have been troubled by instability and short circuits in the sensor coils. During the European Association of National Metrology Institutes (EUROMET) regional key comparison, EUROMET.T-K4 found that the selected HTSPRTs were M. Zhao (B) · D. Chen · M. Newman · R. Ding Fluke Corporation, Hart Scientific Division, American Fork, UT 84003, USA e-mail: mingjian.zhao@hartscientific.com less stable than desired, and one of the Bureau International des Poids et Mesures (BIPM) HTSPRTs failed due to a short circuit in the sensor [1]. Similar problems were reported in other laboratories such as the National Metrology Institute of Japan (NMIJ).…”

Section: Introductionmentioning

confidence: 99%

Improved High-Temperature Standard Platinum Resistance Thermometer

Zhao¹,

Chen²,

Newman³

et al. 2010

Int J Thermophys

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To prevent short circuits, to improve stability, and to raise the upper temperature limit to the freezing point of copper (1084.62 • C), the high-temperature standard platinum resistance thermometer (HTSPRT) was redesigned. The most important change was an improvement in the structure of the sensor support. The strip support was replaced by a new specially designed cross support. The structure and design of the new HTSPRT are briefly described in this article. The test results of a group of thermometers are presented. The test included long-term drifts of the thermometers at the triple point of water and freezing point of silver during a period of a few hundred hours operation at 1085 • C, the short-term stability of R (tpw) and W (Ag) in a period of 5 days, and thermal cycles between 22 • C and 1085 • C. The test results show that the thermometer performance is improved, and the new HTSPRT can operate up to the freezing point of copper.

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Intercomparison of the Realization of the ITS-90 at the Freezing Points of Al and Ag among European NMIs

Cited by 8 publications

References 4 publications

Bilateral Comparison of Aluminum Fixed-Point Cells Using Standard Platinum Resistance Thermometer

Bilateral Comparison of Aluminum Fixed-Point Cells Using Standard Platinum Resistance Thermometer

Realization of the Temperature Scale in the Range from 234.3 K (Hg Triple Point) to 1084.62°C (Cu Freezing Point) in Croatia

Improved High-Temperature Standard Platinum Resistance Thermometer

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