CCT-K7.2021
MEASURAND Temperature of the triple point of water
NOMINAL VALUE 273.16 K
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µK.
CCT-K7.2021
MEASURAND Temperature of the triple point of water
NOMINAL VALUE 273.16 K
Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in µK.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
µK |
µK |
µK |
||
| CEM | 47.0 | 78.1 | ||
| INMETRO | -39.9 | 71.3 | ||
| IPQ | 7.0 | 158.3 | ||
| KRISS | -4.7 | 63.2 | ||
| LNE-LCM/Cnam | 1.2 | 97.6 | ||
| MSL | 14.1 | 25.3 | ||
| NIM | -1.1 | 63.0 | ||
| NMIA | -21.0 | 46.2 | ||
| NMIJ | 22.4 | 60.6 | ||
| NMISA | -1.5 | 120.9 | ||
| NPL | 10.8 | 47.6 | ||
| NRC | -6.9 | 36.8 | ||
| PTB | 6.9 | 50.4 | ||
| UME | -64.1 | 104.7 | ||
| VSL | -44.7 | 56.3 |
| Metrology area, Sub-field | Thermometry, Fixed Point Cells |
| Description | Comparison of Water Triple Point Cells |
| Time of measurements | 2021 - 2022 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| Measurand | Triple point of water 273.16 K |
| Transfer device | Triple point of water cell |
| Comparison type | Key Comparison |
| Consultative Committee | CCT (Consultative Committee for Thermometry) |
| Conducted by | CCT (Consultative Committee for Thermometry) |
| Pilot institute |
NRC
National Research Council Canada |
| Contact person | Andrea Peruzzi |
| Pilot laboratory | |
|---|---|
| NRC |
National Research Council, Canada, SIM |
| CEM |
Centro Español de Metrologia, Spain, EURAMET |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| IPQ |
Instituto Portugues da Qualidade, Portugal, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| LNE-LCM/Cnam |
Conservatoire National des Arts et Métiers/Laboratoire Commun de Métrologie, France, EURAMET |
| MSL |
Measurement Standards Laboratory, New Zealand, APMP |
| NIM |
National Institute of Metrology, China, APMP |
| NMIA |
National Measurement Institute, Australia, Australia, APMP |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| NPL |
National Physical Laboratory, United Kingdom, EURAMET |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
| VSL |
VSL, Netherlands, EURAMET |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
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CCT-K7.2021
MEASURAND Temperature of the triple point of water
NOMINAL VALUE 273.16 K
The key comparison reference value, xR, and its combined uncertainty, uR, are calculated using the adaptive weighted average (DerSimonian-Laird procedure, see [1]) of the NIST Decision Tree [2]. For the particular data set of this key comparison, the result of the adaptive weighted average is identical to that of the conventional weighted average.
xR = 4.7 µK
uR = 7.2 µK
[1] R. DerSimonian, N. Laird (1986) "Meta-analysis in clinical trials," Controlled Clinical Trials 7(3):177-188.
[2] A. Possolo, A. Koepke, D. Newton, M.r. Winchester, "Decision Tree for Key Comparisons," 2021 J Res Natl Inst Stan 126:126007
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms:
Di = (xi - xR) and its expanded uncertainty Ui (k = 2), both expressed in µK.
The expanded uncertainties of the Di take into account the correlations between the measured values and the key comparison reference value.
CCT-K7.2021
MEASURAND Temperature of the triple point of water
NOMINAL VALUE 273.16 K
PILOT LABORATORY NRC
xi : temperature difference between the national reference of laboratory i and the pilot's reference, xi = TLabi - TPilot Ref, where T is the temperature
ui : standard uncertainty of xi
See also section 5.1 of the Final report for the calculation of xi and ui
| Labi | xi | ui | |
| µK | µK | ||
| CEM | 51.7 | 40.2 | |
| INMETRO | -35.1 | 37.6 | |
| IPQ | 11.7 | 82.3 | |
| KRISS | 0.0 | 32.4 | |
| LNE-LCM/Cnam | 5.9 | 50.7 | |
| MSL | 18.8 | 13.2 | |
| NIM | 3.6 | 33.1 | |
| NMIA | -16.2 | 24.4 | |
| NMIJ | 27.1 | 31.9 | |
| NMISA | 3.2 | 62.2 | |
| NPL | 15.5 | 24.9 | |
| NRC | -2.2 | 19.8 | |
| PTB | 11.6 | 26.7 | |
| UME | -59.3 | 53.8 | |
| VSL | -39.9 | 29.6 |
