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CCT-K4, EUROMET.T-K4, EURAMET.T-K3.3, APMP.T-K4 and EURAMET.T-K3.5

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

Degrees of equivalence Di and expanded uncertainty Ui (95% level of confidence) expressed in mK

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CCT-K4 and EUROMET.T-K4

MEASURAND : Freezing-point temperature of Silver (Ag) fixed-point cells
NOMINAL TEMPERATURE : 961.78 °C

Degrees of equivalence Di and expanded uncertainty Ui (95% level of confidence) expressed in mK

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CCT-K4, EUROMET.T-K4, EURAMET.T-K3.3, APMP.T-K4 and EURAMET.T-K3.5

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

Degrees of equivalence, Di and expanded uncertainty Ui, relative to the CCT-K4 key comparison reference value

* LNE-INM was named "BNM-INM" at the time of key comparison CCT-K4
** INRIM was named "IMGC" at the time of key comparison CCT-K4

   
Lab iDiUi
 / mK/ mK
BNM-INM0.251.47
IMGC1.001.44
KRISS-2.262.13
NIM-0.133.49
NIST1.011.08
NMi-VSL-4.354.16
CSIRO-NML1.931.51
NPL-2.252.39
NRC0.561.46
NMIJ-1.791.60
PTB-0.751.54
VNIIM-1.501.82

Results are presented under A4 printable format in Summary Results (PDF file).

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CCT-K4 and EUROMET.T-K4

MEASURAND : Freezing-point temperature of Silver (Ag) fixed-point cells
NOMINAL TEMPERATURE : 961.78 °C

Degrees of equivalence, Di and expanded uncertainty Ui, relative to the CCT-K4 key comparison reference value

* LNE-INM was named "BNM-INM" at the time of key comparison CCT-K4
** INRIM was named "IMGC" at the time of key comparison CCT-K4

Pair-wise degrees of equivalence inside key comparison CCT-K4

   
Lab iDiUi
 / mK/ mK
BNM-INM-2.693.13
IMGC0.852.58
KRISS0.742.69
NIM-3.036.18
NIST1.161.01
NMi-VSL-7.124.15
CSIRO-NML-13.0312.89
NPL-3.893.97
NRC1.234.95
NMIJ-2.743.29
PTB1.271.50
VNIIM-2.162.40

Results are presented under A4 printable format in Summary Results (PDF file).

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CCT-K4
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Metrology area, Sub-field Thermometry, Fixed Point Cells
Description Comparison of local realizations of Aluminium and Silver freezing-point temperatures
Time of measurements 1998 - 2000
Status Approved for equivalence
Final Reports of the comparisons
Metrologia, 2002, 39, Tech. Suppl., 03001
Measurand Temperature: 660.323 °C for Aluminium and 961 78 °C for Silver
Transfer device Aluminium and Silver cells, plus high temperature standard platinum resistance thermometers
Comparison type Key Comparison
Consultative Committee CCT (Consultative Committee for Thermometry)
Conducted by CCT (Consultative Committee for Thermometry)
Comments

Results published on 12 March 2002

EUROMET.T-K4, EURAMET.T-K3.3, APMP.T-K4 and EURAMET.T-K3.5 results are linked to those of CCT-K4

Local realizations of Aluminium and Silver freezing-point temperatures
Pilot institute PTB
Physikalisch-Technische Bundesanstalt
Germany
Contact person H.G. Nubbemeyer

+49 (0) 30 3481 246
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

NIM

National Institute of Metrology, China, APMP

NIST

National Institute of Standards and Technology, United States, SIM

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NPL

National Physical Laboratory, United Kingdom, EURAMET

NRC

National Research Council, Canada, SIM

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

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CCT-K4, EUROMET.T-K4, EURAMET.T-K3.3, APMP.T-K4 and EURAMET.T-K3.5

  • Key comparison CCT-K4

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

Key comparison reference value for the nominal temperature of Al fixed point:
the key comparison reference temperature, TR, is the weighted average temperature calculated using the sum (ui2 + uc2) of the squared uncertainties to set the weights. It has zero uncertainty by definition.
The degree of equivalence of each laboratory with respect to the key comparison reference value is given by a pair of terms: Di = (Ti - TR) and Ui, its expanded uncertainty at a 95% level of confidence, both expressed in mK.
Ui = [(2uc)2 + Ulab i2]1/2, where Ulab i is the expanded uncertainty of laboratory i at a 95% level of confidence.
The degree of equivalence between two laboratories is given by a pair of terms:
Dij = Di - Dj = Ti - Tj and Uij, its expanded uncertainty at a 95% level of confidence (see equations 1 to 3 of the CCT-K4 Final Report, pages 22 to 23), both expressed in mK.
  • Linking EUROMET.T-K4 to CCT-K4
The reference value TEUR of key comparison EUROMET.T-K4 is computed as the simple mean of the EUROMET.T-K4 participants' results, the EIM result being eliminated as an obvious outlier. The expanded uncertainty (k = 2) is calculated from the uncertainties of the laboratories. TEUR = TPTB - (1.18 +/- 1.06) mK, (k = 2)
The linkage of EUROMET.T-K4 results to those of CCT-K4 is explained in Section 5.4 of the EUROMET.T-K4 Final Report, and is based on the results of common participants to both comparisons: INRIM, LNE-INM, NPL, PTB, VNIIM, and NMi-VSL.
TEUR = TR + (1.65 +/- 2.28) mK, (k = 2)
This equation allows to deduce the degrees of equivalence of the EUROMET.T-K4 participants relative to the CCT-K4 key comparison reference value, each composed of the offset Di and Ui, its expanded uncertainty (k = 2), expressed in mK.
The pair-wise degrees of equivalence inside key comparison EUROMET.T-K4 are composed of two terms Dij and Uij, its expanded uncertainty (k = 2), expressed in mK, computed as explained in Section 7 of the EUROMET.T-K4 Final Report.
  • Linking EURAMET.T-K3.3 to CCT-K4

The LACOMET result obtained in EURAMET.T-K3.3 is linked to the results of CCT-K4 using the participation of CEM in EUROMET.T-K4, whose results are linked to those of CCT-K4, as described above.

  • Linking APMP.T-K4 to CCT-K4

The participants' results obtained in APMP.T-K4 are linked to the results of CCT-K4 using the common participation of KRISS and NMIJ in both key comparisons. The linkage process is explained in section 4.2 of the APMP.T-K4 Final Report, and leads to the computation of the degrees of equivalence of participants in APMP.T-K4 relative to the CCT-K4 reference value.

  • Linking EURAMET.T-K3.5 to CCT-K4

The ROTH+CO.AG result obtained in EURAMET.T-K3.5 is linked to the results of CCT-K4 using the participation of VSL in EUROMET.T-K4, whose results are linked to those of CCT-K4, as described above.

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CCT-K4 and EUROMET.T-K4

  • Key comparison CCT-K4

MEASURAND : Freezing-point temperature of Silver (Ag) fixed-point cells
NOMINAL TEMPERATURE : 961.78 °C

Key comparison reference value for the nominal temperature of Ag fixed point:
the key comparison reference temperature, TR, is the weighted average temperature calculated using the sum (ui2 + uc2) of the squared uncertainties to set the weights. It has zero uncertainty by definition.

The degree of equivalence of each laboratory with respect to the key comparison reference value is given by a pair of terms: Di = (Ti - TR) and Ui, its expanded uncertainty at a 95% level of confidence, both expressed in mK.
Ui = [(2uc)2 + Ulab i2]1/2, where Ulab i is the expanded uncertainty of laboratory i at a 95% level of confidence.

The degree of equivalence between two laboratories is given by a pair of terms:
Dij = Di - Dj = Ti - Tj and Uij, its expanded uncertainty at a 95% level of confidence (see equations 1 to 3 of the CCT-K4 Final Report, pages 22 to 23), both expressed in mK.
  • Linking EUROMET.T-K4 to CCT-K4

The reference value TEUR of key comparison EUROMET.T-K4 is computed as the simple mean of the EUROMET.T-K4 participants' results. The expanded uncertainty (k = 2) is calculated from the uncertainties of the laboratories.
TEUR = TTPV - (0.52 +/- 1.30) mK, (k = 2)
The linkage of EUROMET.T-K4 results to those of CCT-K4 is explained in Section 6.6 of the EUROMET.T-K4 Final Report, and is based on the results of common participants to both comparisons: INRIM, LNE-INM, NPL, PTB, VNIIM, and NMi-VSL.
TEUR = TR - (3.48 +/- 4.16) mK, (k = 2)

This equation allows to deduce the degrees of equivalence of the EUROMET.T-K4 participants relative to the CCT-K4 key comparison reference value, each composed of the offset Di and Ui, its expanded uncertainty (k = 2), expressed in mK.

The pair-wise degrees of equivalence inside key comparison EUROMET.T-K4 are composed of two terms Dij and Uij, its expanded uncertainty (k = 2), expressed in mK, computed as explained in Section 7 of the EUROMET.T-K4 Final Report.
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CCT-K4, EUROMET.T-K4, EURAMET.T-K3.3, APMP.T-K4 and EURAMET.T-K3.5

  • Key comparison CCT-K4

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

Ti - Tmc : difference of Al fixed-point temperature realized at laboratory i, Ti, relative to the master circulated cell (PTB/NIST Al 94-3) temperature Tmc
Cell : designation of Al cell at laboratory i
ui : combined standard uncertainty of laboratory i
uc = 0.5 mK : standard uncertainty representing the stability of the circulated cells

 Lab i Cell (Ti - Tmc)
/ mK		 ui
/ mK		 (ui2 + uc2)1/2
/ mK
         
 BNM-INM Al 123 3.87 0.51 0.72
 IMGC Al Co3 4.62 0.50 0.71
 KRISS Al 1.36 0.90 1.03
 NIM Al 1 3.49 0.90 1.03
 NIST Al 94-2 4.63 0.19 0.54
 NMi-VSL 93T267 -0.74 1.93 1.99
 CSIRO-NML Al 98/2 5.55 0.44 0.67
 NPL Al 89 1.37 0.98 1.10
 NRC Al-6 4.18 0.50 0.71
 NMIJ Al 97-1 1.83 0.61 0.79
 PTB Al 97-2 2.87 0.55 0.75
 VNIIM Al 2.12 0.71 0.87

  • Key comparison EUROMET.T-K4

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

Ti - TPTB : difference of Al fixed-point temperature realized at laboratory i, Ti, relative to the PTB result. PTB is the Pilot Laboratory and is the only laboratory with measurements in the four loops organized in key comparison EUROMET.T-K4 - see Section 5.2 of the EUROMET.T-K4 Final Report
ULab i : expanded uncertainty (k = 2) of Ti - TPTB

 Lab i

(Ti - TPTB)
/ mK

 ULab i
/ mK
     
 DTI -1.45 5.65
 JV -1.42 4.69
 MKEH -5.60 4.04
 SMU 0.52 3.65
 INM(RO) -6.63 3.77
 UME -2.08 4.34
 DZM/FSB -5.26 12.62
 CMI -1.30 4.49
 GUM

1.58

3.88
 LNE-INM* 1.92 3.54
 MIRS -3.20 3.64
 METAS 3.42 3.04
 BEV 0.45 4.31
 NPL

-0.89

2.81
 SP

0.67

3.46
 VMT/PFI

0.67

4.24
 VNIIM

0.86

2.86
 MIKES

-2.34

4.55
 EIM

-14.82

5.99
 INRIM**

-3.21

4.62
 IPQ

-1.84

4.42
 CEM

-1.53

7.49
 NMi-VSL

-0.47

4.63
 PTB

0.00

3.36

* LNE-INM was named "BNM-INM" at the time of key comparison CCT-K4
** INRIM was named "IMGC" at the time of key comparison CCT-K4

  • Key comparison EURAMET.T-K3.3

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

This is a bilateral comparison carried out between CEM and LACOMET in 2009

TLACOMET - TCEM = 0.8 mK and U(TLACOMET - TCEM) = 5.4 mK (see on page 14 of the EURAMET.T-K3.3 Final Report), with U being the expanded uncertainty considering a coverage factor k equal to 2

  • Key comparison APMP.T-K4

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

Ti - TKRISS : difference of Al fixed-point temperature realized at laboratory i, Ti, relative to the KRISS result. KRISS is the Pilot Laboratory and is the only laboratory with measurements in the two loops organized in key comparison APMP.T-K4 - see page 4 of the APMP.T-K4 Final Report
ULab i : expanded uncertainty (k = 2) of Ti - TKRISS

 Lab i

(Ti - TKRISS)
/ mK

 ULab i
/ mK
     
 KRISS 0.00 5.10
 NMIJ 2.20 4.70
 SCL 4.18 4.56
 NMC, A*STAR 6.04 6.02
 CMS -0.07 5.46
 NIMT -0.43 8.28
 NML-SIRIM -11.34 7.70
 NPLI 5.83 5.12
  • Key comparison EURAMET.T-K3.5

MEASURAND : Freezing-point temperature of Aluminium (Al) fixed-point cells
NOMINAL TEMPERATURE : 660.323 °C

This is a bilateral comparison carried out between VSL and ROTH+CO.AG in 2013

TROTH+CO.AG - TVSL = 4.69 mK and U(TROTH+CO.AG - TVSL) = 4.81 mK (see on page 11 of the EURAMET.T-K3.5 Final Report), with U being the expanded uncertainty considering a coverage factor k equal to 2

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CCT-K4 and EUROMET.T-K4

  • Key comparison CCT-K4

MEASURAND : Freezing-point temperature of Silver (Ag) fixed-point cells
NOMINAL TEMPERATURE : 961.78 °C

Ti - Tmc : difference of Ag fixed-point temperature realized at laboratory i, Ti, relative to the master circulated cell (PTB Ag 6) temperature Tmc
Cell : designation of Ag cell at laboratory i
ui : combined standard uncertainty of laboratory i
uc = 0.2 mK : standard uncertainty representing the stability of the circulated cells

 Lab i Cell (Ti - Tmc)
/ mK		 ui
/ mK		 (ui2 + uc2)1/2
/ mK
 BNM-INM Ag 105 -3.96 1.52 1.53
 IMGC Ag JM2 -0.42 1.17 1.18
 KRISS Ag -0.53 1.29 1.30
 NIM Ag 9402 -4.30 1.56 1.57
 NIST Ag 92-1 -0.11 0.43 0.48
 NMi-VSL 92T199 -8.39 1.93 1.94
 CSIRO-NML Ag -14.3 6.42 6.42
 NPL Ag 8/97 -5.16 1.79 1.80
 NRC Ag-6 -0.04 2.45 2.46
 NMIJ Ag 98-1 -4.01 1.58 1.60
 PTB Ag 6 0 0.71 0.73
 VNIIM Ag -3.43 1.08 1.10

  • Key comparison EUROMET.T-K4

MEASURAND : Freezing-point temperature of Silver (Ag) fixed-point cells
NOMINAL TEMPERATURE : 961.78 °C

Ti - TTPV : difference of Ag fixed-point temperature realized at laboratory i, Ti, relative to the "Thermometer PTB Value", TTPV, as explained in Sections 6.3 and 6.4 of the EUROMET.T-K4 Final Report
ULab i : expanded uncertainty (k = 2) of Ti - TTPV

 Lab i

(Ti - TTPV)
/ mK

 ULab i
/ mK
 CMI -7.99 7.03
 GUM -2.72 6.34
 LNE-INM* 5.90 8.57
 MIRS -1.35 8.20
 METAS -5.45 7.97
 BEV -4.48 7.57
 SMU -2.55 12.97
 NPL -2.34 13.37
 SP -2.80 14.00
 VMT/PFI 7.17 14.11
 VNIIM 6.47 13.64
 MIKES 2.57 10.69
 EIM

6.31

10.22

 INRIM**

-0.62

8.57

 IPQ

2.08

10.70

 CEM

0.67

13.62

 NMi-VSL

-0.70

8.67

 PTB

-2.27

9.95

* LNE-INM was named "BNM-INM" at the time of key comparison CCT-K4
** INRIM was named "IMGC" at the time of key comparison CCT-K4