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, 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

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

Comparison
Comparison close
RMO comparison
Linked comparison
APMP.T-K4
Metrology area, Sub-field Thermometry, Fixed Point Cells
Description Comparison of local realizations of Aluminium freezing-point temperatures
Time of measurements 2003 - 2005
Status Approved for equivalence
Final Reports of the comparisons
Measurand Temperature: 660.323 °C
Transfer device Aluminium cells, plus high temperature standard platinum resistance thermometers
Comparison type Key Comparison
Consultative Committee CCT (Consultative Committee for Thermometry)
Conducted by APMP (Asia Pacific Metrology Programme)
Comments

Results published on 22 May 2013

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 freezing-point temperature

Pilot institute KRISS
Korea Research Institute of Standards and Science
Korea, Republic of
Contact person Kee Sool Gam
ksgam@kriss.re.kr
+82 42 868 5193
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
KRISS

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

CMS

ITRI Center for Measurement Standards, Chinese Taipei, APMP

NIMT

National Institute of Metrology (Thailand), Thailand, APMP

NMC, A*STAR

National Metrology Centre, Agency for Science, Technology and Research, Singapore, APMP

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NML-SIRIM

National Metrology Laboratory, SIRIM Berhad (became NMIM), Malaysia, APMP

NPLI

CSIR National Physical Laboratory of India, India, APMP

SCL

Standards and Calibration Laboratory, Hong Kong, China, APMP

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.

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