CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 3 Pa
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (95% level of confidence) expressed in Pa
Red diamonds : participants in CCM.PK4
Pink squares : participants in EUROMET.M.PK1.a
Blue triangles : participants in EURAMET.M.PK4.2010
Note: Information not apparent on the graph
 D_{CSIRONML }= 0.30 Pa and U_{CSIRONML} = 0.05 Pa,
 U_{OMH} = 0.23 Pa
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 10 Pa
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (95% level of confidence) expressed in Pa
Red diamonds : participants in CCM.PK4
Pink squares : participants in EUROMET.M.PK1.a
Blue triangles : participants in EURAMET.M.PK4.2010
Note: Information not apparent on the graph
 D_{CSIRONML }= 0.57 Pa and U_{CSIRONML} = 0.10 Pa,
 D_{OMH} = 0.40 Pa and U_{OMH} = 0.92 Pa
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 30 Pa
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (95% level of confidence) expressed in Pa
Red diamonds : participants in CCM.PK4
Pink squares : participants in EUROMET.M.PK1.a
Blue triangles : participants in EURAMET.M.PK4.2010
Note: Information not apparent on the graph
 D_{CSIRONML }= 0.91 Pa and U_{CSIRONML} = 0.15 Pa,
 D_{OMH} = 2.0 Pa and U_{OMH} = 3.2 Pa
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 100 Pa
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (95% level of confidence) expressed in Pa
Red diamonds : participants in CCM.PK4
Pink squares : participants in EUROMET.M.PK1.a only
Note: Information not apparent on the graph
D_{OMH} = 2.5 Pa and U_{OMH} = 3.1 Pa
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 300 Pa
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (95% level of confidence) expressed in Pa
Red diamonds : participants in CCM.PK4
Pink squares : participants in EUROMET.M.PK1.a only
CNRIMGC: two different methods
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 1000 Pa
Degrees of equivalence D_{i} and expanded uncertainty U_{i} (95% level of confidence) expressed in Pa
Red diamonds : participants in CCM.PK4
Pink squares : participants in EUROMET.M.PK1.a only
CNRIMGC: two different methods
CCM.PK4, EUROMET.M.PK1.a, EUROMET.M.PK1.b, SIMEUROMET.M.PBK3 and EURAMET.M.PK15.1
MEASURAND Pressure
NOMINAL VALUE 1 Pa
Degrees of equivalence represented by D_{i} = (x_{I}  x_{R}) and its expanded uncertainty U_{i} at a 95 % level of confidence, both expressed in Pa.
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 3 Pa
Lab i  
D_{i}  U_{i}  
/ Pa  / Pa  
CSIRONML  0.301  0.052 
CNRIMGC  0.004  0.016 
NIST  0.0008  0.0037 
NPLI  0.0071  0.0049 
NPL  0.001  0.016 
PTB  0.0013  0.0075 
BNMLNE  0.017  0.013 
MIKES  0.041  0.052 
SP  0.0056  0.068 
CEM  0.0020  0.024 
OMH  0.093  0.23 
UME  0.018  0.018 
NMiVSL  0.033  0.036 
CMI  0.008  0.026 
INRIM  0.010  0.026 
LNE  0.003  0.026 
MIKES  0.022  0.072 
In pink: participants in EUROMET.M.PK1.a.
In blue: participants in EURAMET.M.PK4.2010.
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a and EURAMET.M.PK4.2010.
Results are presented under A4 printable format in Summary Results (PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 10 Pa
Lab i  
D_{i}  U_{i}  
/ Pa  / Pa  
CSIRONML  0.57  0.10 
CNRIMGC  0.015  0.053 
KRISS  0.003  0.023 
NIST  0.000  0.013 
NPLI  0.018  0.016 
NPL  0.003  0.053 
PTB  0.005  0.025 
BNMLNE  0.040  0.041 
MIKES  0.043  0.082 
SP  0.0080  0.13 
CEM  0.0072  0.079 
OMH  0.40  0.92 
UME  0.051  0.058 
NMiVSL  0.0058  0.037 
CMI  0.010  0.028 
INRIM  0.003  0.028 
LNE  0.010  0.028 
MIKES  0.001  0.073 
In pink: participants in EUROMET.M.PK1.a.
In blue: participants in EURAMET.M.PK4.2010.
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a and EURAMET.M.PK4.2010.
Results are presented under A4 printable format in Summary Results (PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 30 Pa
Lab i  
D_{i}  U_{i}  
/ Pa  / Pa  
CSIRONML  0.91  0.15 
CNRIMGC  0.06  0.16 
KRISS  0.022  0.035 
NIST  0.010  0.029 
NPLI  0.047  0.041 
NPL  0.03  0.10 
PTB  0.002  0.062 
BNMLNE  0.078  0.11 
MIKES  0.050  0.20 
SP  0.055  0.32 
CEM  0.037  0.20 
OMH  2.0  3.2 
UME  0.11  0.14 
NMiVSL  0.064  0.042 
CMI  0.016  0.028 
INRIM  0.004  0.028 
LNE  0.014  0.028 
MIKES  0.007  0.074 
In pink: participants in EUROMET.M.PK1.a.
In blue: participants in EURAMET.M.PK4.2010.
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a and EURAMET.M.PK4.2010.
Results are presented under A4 printable format in Summary Results (PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 100 Pa
Lab i  
D_{i}  U_{i}  
/ Pa  / Pa  
CSIRONML  0.83  0.20 
CNRIMGC  0.18  0.11 
KRISS  0.036  0.081 
NIST  0.009  0.074 
NPLI  0.13  0.11 
NPL  0.08  0.30 
PTB  0.00  0.19 
BNMLNE  0.17  0.38 
MIKES  0.077  0.70 
SP  0.15  0.96 
CEM  0.15  0.63 
OMH  2.5  3.1 
UME  0.32  0.47 
NMiVSL  0.096  0.069 
CNRIMGC  0.080  0.40 
In pink: participants in EUROMET.M.PK1.a only.
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a.
Results are presented under A4 printable format in Summary Results (PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 300 Pa
Lab i  
D_{i}  U_{i}  
/ Pa  / Pa  
CSIRONML  0.57  0.34 
CNRIMGC  0.13  0.24 
KRISS  0.01  0.22 
NIST  0.01  0.22 
NPLI  0.24  0.33 
NPL  0.20  0.90 
PTB  0.08  0.56 
BNMLNE  0.30  0.57 
MIKES  0.10  1.3 
SP  0.30  1.3 
CEM  0.30  1.3 
CNRIMGC  0.13  0.61 
In pink: participants in EUROMET.M.PK1.a only.
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a.
Results are presented under A4 printable format in Summary Results (PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 1000 Pa
Lab i  
D_{i}  U_{i}  
/ Pa  / Pa  
CSIRONML  0.33  0.78 
CNRIMGC  0.18  0.74 
KRISS  0.06  0.74 
NIST  0.03  0.73 
NPLI  0.9  1.4 
NPL  0.7  3.0 
PTB  0.3  1.9 
BNMLNE  0.38  1.9 
MIKES  0.32  4.5 
SP  0.51  2.3 
CEM  0.38  4.2 
CNRIMGC  0.38  2.0 
In pink: participants in EUROMET.M.PK1.a only.
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a.
Results are presented under A4 printable format in Summary Results (PDF file).
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4, EUROMET.M.PK1.a, EUROMET.M.PK1.b, SIMEUROMET.M.PBK3 and EURAMET.M.PK15.1
MEASURAND Pressure
NOMINAL VALUE 1 Pa
Degrees of equivalence represented by D_{i} = (x_{I}  x_{R}) and its expanded uncertainty U_{i} at a 95 % level of confidence, both expressed in Pa.
Metrology area, Subfield  Mass and related quantities, Pressure 
Description  Pressure measurements in Nitrogen (absolute mode) 
Time of measurements  1999  2002 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Pressure: 0.1 Pa to 1000 Pa 
Transfer device  Pressure transducers 
Comparison type  Key Comparison 
Consultative Committee  CCM (Consultative Committee for Mass and Related Quantities) 
Conducted by  EURAMET (European Association of National Metrology Institutes) 
RMO Internal Identifier  EUROMET Project No 442, phase A 
Comments  The CCM.PK4 results were published on 08 February 2002, then completed with EUROMET.M.PK1.b and SIMEUROMET.M.PBK3 results at nominal pressure close to 1 Pa, on 15 November 2004. Pressure measurements in gas (absolute mode)

Pilot institute 
CNRIMGC
Consiglio Nazionale delle Ricerche  Istituto di Metrologia G. Colonnetti (until 2006) Italy 
Contact person  A. Calcatelli +39 011 3977 413 
Additional 
Pilot laboratory  

CNRIMGC 
Consiglio Nazionale delle Ricerche  Istituto di Metrologia G. Colonnetti (until 2006), Italy, EURAMET 
BNMLNE 
Bureau National de Métrologie  Laboratoire National d'Essais, France, EURAMET 
CEM 
Centro Español de Metrologia, Spain, EURAMET 
MIKES 
VTT Technical Research Centre of Finland Ltd, Centre for Metrology/Mittatekniikan keskus, Finland, EURAMET 
NMiVSL 
Nederlands Meetinstituut  Van Swinden Laboratorium (became VSL in 2009), Netherlands, EURAMET 
NPL 
National Physical Laboratory, United Kingdom, EURAMET 
OMH 
Országos Mérésügyi Hivatal; Subsequently MKEH, now BKFH, Hungary, EURAMET 
PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
SP 
Technical Research Institute of Sweden from 2017 Research Institutes of Sweden AB, Sweden, EURAMET 
UME 
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET 
This page proposes printout on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 3 Pa
The key comparison reference value, p_{R}, is obtained from an unweighted mean of the measurement method means (outliers excluded). A correction is applied to set p_{R} numerically equal to the nominal pressure (see CCM.PK4 Final Report, page 41). 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (p_{i}  p_{R}) and U_{i}, its expanded uncertainty at a 95% level of confidence, both expressed in Pa. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (p_{i}  p_{j}) and U_{ij}, its expanded uncertainty at 95% level of confidence, both expressed in Pa. 
The results of EUROMET.M.PK1.a are linked to those of CCM.PK4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNRIMGC, PTB, and NPL.
The CNRIMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.PK4.
The detailed calculation used in the linking process is presented on pages 20 and 21 of the EUROMET.M.PK1.a Final report.
The degrees of equivalence of laboratories having participated in EUROMET.M.PK1.a only (plus those of CNRIMGC in the range 100 Pa to 1000 Pa) relative to the CCM.PK4 key comparison reference values are obtained from the linking process and are given in table 11 on page 22 of the EUROMET.M.PK1.a Final Report. 
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a. 
PTB provides the link between key comparisons CCM.PK4 and EURAMET.M.PK4.2010 for nominal pressures 3 Pa, 10 Pa, and 30 Pa.
The linkage process is described in Section 11 of the EURAMET.M.PK4.2010 Final Report.
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 10 Pa
The key comparison reference value, p_{R}, is obtained from an unweighted mean of the measurement method means (outliers excluded). A correction is applied to set p_{R} numerically equal to the nominal pressure (see CCM.PK4 Final Report, page 41). The combined standard uncertainty of p_{R} is u_{R} (see CCM.PK4 Final Report, page 42). 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (p_{i}  p_{R}) and U_{i}, its expanded uncertainty at a 95% level of confidence, both expressed in Pa. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (p_{i}  p_{j}) and U_{ij}, its expanded uncertainty at 95% level of confidence, both expressed in Pa. 
The results of EUROMET.M.PK1.a are linked to those of CCM.PK4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNRIMGC, PTB, and NPL.
The CNRIMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.PK4.
The detailed calculation used in the linking process in presented on pages 20 and 21 of the EUROMET.M.PK1.a Final report.
The degrees of equivalence of laboratories having participated in EUROMET.M.PK1.a only (plus those of CNRIMGC in the range 100 Pa to 1000 Pa) relative to the CCM.PK4 key comparison reference values are obtained from the linking process and are given in table 11 on page 22 of the EUROMET.M.PK1.a Final Report. 
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a. 
PTB provides the link between key comparisons CCM.PK4 and EURAMET.M.PK4.2010 for nominal pressures 3 Pa, 10 Pa, and 30 Pa.
The linkage process is described in Section 11 of the EURAMET.M.PK4.2010 Final Report.
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL VALUE : 30 Pa
The key comparison reference value, p_{R}, is obtained from an unweighted mean of the measurement method means (outliers excluded). A correction is applied to set p_{R} numerically equal to the nominal pressure (see CCM.PK4 Final Report, page 41). The combined standard uncertainty of p_{R} is u_{R} (see CCM.PK4 Final Report, page 42). 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (p_{i}  p_{R}) and U_{i}, its expanded uncertainty at a 95% level of confidence, both expressed in Pa. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (p_{i}  p_{j}) and U_{ij}, its expanded uncertainty at 95% level of confidence, both expressed in Pa. 
The results of EUROMET.M.PK1.a are linked to those of CCM.PK4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNRIMGC, PTB, and NPL.
The CNRIMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.PK4.
The detailed calculation used in the linking process in presented on pages 20 and 21 of the EUROMET.M.PK1.a Final report.
The degrees of equivalence of laboratories having participated in EUROMET.M.PK1.a only (plus those of CNRIMGC in the range 100 Pa to 1000 Pa) relative to the CCM.PK4 key comparison reference values are obtained from the linking process and are given in table 11 on page 22 of the EUROMET.M.PK1.a Final Report. 
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a. 
PTB provides the link between key comparisons CCM.PK4 and EURAMET.M.PK4.2010 for nominal pressures 3 Pa, 10 Pa, and 30 Pa.
The linkage process is described in Section 11 of the EURAMET.M.PK4.2010 Final Report.
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 100 Pa
The key comparison reference value, p_{R}, is obtained from an unweighted mean of the measurement method means (outliers excluded). 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (p_{i}  p_{R}) and U_{i}, its expanded uncertainty at a 95% level of confidence, both expressed in Pa. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (p_{i}  p_{j}) and U_{ij}, its expanded uncertainty at 95% level of confidence, both expressed in Pa. 
The results of EUROMET.M.PK1.a are linked to those of CCM.PK4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNRIMGC, PTB, and NPL.
The CNRIMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.PK4.
The detailed calculation used in the linking process in presented on pages 20 and 21 of the EUROMET.M.PK1.a Final report.
The degrees of equivalence of laboratories having participated in EUROMET.M.PK1.a only (plus those of CNRIMGC in the range 100 Pa to 1000 Pa) relative to the CCM.PK4 key comparison reference values are obtained from the linking process and are given in table 11 on page 22 of the EUROMET.M.PK1.a Final Report. 
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a. 
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 300 Pa
The key comparison reference value, p_{R}, is obtained from an unweighted mean of the measurement method means. 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (p_{i}  p_{R}) and U_{i}, its expanded uncertainty at a 95% level of confidence, both expressed in Pa. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (p_{i}  p_{j}) and U_{ij}, its expanded uncertainty at 95% level of confidence, both expressed in Pa. 
The results of EUROMET.M.PK1.a are linked to those of CCM.PK4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNRIMGC, PTB, and NPL.
The CNRIMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.PK4.
The detailed calculation used in the linking process in presented on pages 20 and 21 of the EUROMET.M.PK1.a Final report.
The degrees of equivalence of laboratories having participated in EUROMET.M.PK1.a only (plus those of CNRIMGC in the range 100 Pa to 1000 Pa) relative to the CCM.PK4 key comparison reference values are obtained from the linking process and are given in table 11 on page 22 of the EUROMET.M.PK1.a Final Report. 
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a. 
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL VALUE : 1000 Pa
The key comparison reference value, p_{R}, is obtained from an unweighted mean of the measurement method means. 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (p_{i}  p_{R}) and U_{i}, its expanded uncertainty at a 95% level of confidence, both expressed in Pa. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (p_{i}  p_{j}) and U_{ij}, its expanded uncertainty at 95% level of confidence, both expressed in Pa. 
The results of EUROMET.M.PK1.a are linked to those of CCM.PK4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNRIMGC, PTB, and NPL.
The CNRIMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.PK4.
The detailed calculation used in the linking process in presented on pages 20 and 21 of the EUROMET.M.PK1.a Final report.
The degrees of equivalence of laboratories having participated in EUROMET.M.PK1.a only (plus those of CNRIMGC in the range 100 Pa to 1000 Pa) relative to the CCM.PK4 key comparison reference values are obtained from the linking process and are given in table 11 on page 22 of the EUROMET.M.PK1.a Final Report. 
No pairwise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.PK1.a. 
CCM.PK4, EUROMET.M.PK1.a, EUROMET.M.PK1.b, SIMEUROMET.M.PBK3 and EURAMET.M.PK15.1
MEASURAND Pressure
NOMINAL VALUE 1 Pa
CCM.PK4
The key comparison reference value, x_{R}, is obtained from an unweighted mean of the measurement method means (outliers excluded). A correction is applied to set x_{R} numerically equal to the nominal pressure (see CCM.PK4 Final Report, page 41). The combined standard uncertainty of x_{R} is u_{R} (see CCM.PK4 Final Report, page 42), where
x_{R} = 1 Pa and u_{R} = 0.0008 Pa
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms:
D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty at a 95% level of confidence (k = 2), both expressed in Pa
Linking EUROMET.M.PK1.a to CCM.PK4
The results of EUROMET.M.PK1.a are linked to those of CCM.PK4 via CNRIMGC, PTB, and NPL; who participated in both vcomparisons.
Linking EUROMET.M.PK1.b to CCM.PK4
The results of EUROMET.M.PK1.b are linked to those of CCM.PK4 via CNRIMGC, PTB, and NPL; who participated in both vcomparisons.
Linking SIMEUROMET.M.PBK3 to CCM.PK4
The results of SIMEUROMET.M.PBK3 are linked to those of CCM.PK4 via PTB / EUROMET.M.PK1.b who participated in these comparisons.
Linking EURAMET.M.PK15.1 to CCM.PK4
The results of EURAMET.M.PK15.1 at 1 Pas are linked to those of CCM.PK4 via PTB who participated in both comparisons
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL PRESSURE : 3 Pa
p_{i} : corrected mean gauge reading obtained by laboratory i
u_{i} : combined standard uncertainty of p_{i}
Further information on p_{i} and u_{i} may be found respectively on page 15 and page 22 of CCM.PK4 Final Report.
The laboratory individual measurements of the participants in EUROMET.M.PK1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.PK1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.
The laboratory individual measurements of the participants in the key comparison EURAMET.M.PK4.2010 are given in Table 10.7a on page 23 of the EURAMET.M.PK4.2010 Final Report.
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL PRESSURE : 10 Pa
p_{i} : corrected mean gauge reading obtained by laboratory i
u_{i} : combined standard uncertainty of p_{i}
Further information on p_{i} and u_{i} may be found respectively on page 15 and page 22 of CCM.PK4 Final Report.
The laboratory individual measurements of the participants in EUROMET.M.PK1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.PK1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.
The laboratory individual measurements of the participants in the key comparison EURAMET.M.PK4.2010 are given in Table 10.7a on page 23 of the EURAMET.M.PK4.2010 Final Report.
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4, EUROMET.M.PK1.a, and EURAMET.M.PK4.2010
MEASURAND : Pressure
NOMINAL PRESSURE : 30 Pa
p_{i} : corrected mean gauge reading obtained by laboratory i
u_{i} : combined standard uncertainty of p_{i}
Further information on p_{i} and u_{i} may be found respectively on page 15 and page 22 of CCM.PK4 Final Report.
The laboratory individual measurements of the participants in EUROMET.M.PK1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.PK1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.
The laboratory individual measurements of the participants in the key comparison EURAMET.M.PK4.2010 are given in Table 10.7a on page 23 of the EURAMET.M.PK4.2010 Final Report.
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL PRESSURE : 100 Pa
p_{i} : corrected mean gauge reading obtained by laboratory i
u_{i} : combined standard uncertainty of p_{i}
Further information on p_{i} and u_{i} may be found respectively on page 15 and page 22 of CCM.PK4 Final Report.
Lab i  p_{i} / Pa 
u_{i} / Pa 
Measurement method 
Date of 
CSIRONML  100.831  0.093 
LiquidColumn Manometer 
24 Feb to 03 Mar 1999 
CNRIMGC  100.176  0.051 
LiquidColumn Manometer 
19 Jan to 08 Feb 1999 
KRISS  100.036  0.021 
LiquidColumn Manometer 
15 Jun to 22 Jun 1999 
NIST  99.9909  0.0053 
LiquidColumn Manometer(s) 
17 Mar to 03 Apr and 08 Jul to 24 Jul 1998, 23 Apr to 06 May and 23 Aug to 10 Sep 1999 
NPLI  99.874  0.055 
Static Expansion System 
01 Jan to 14 Jan 1999 
NPL  99.92  0.18 
Static Expansion System 
17 Nov to 25 Nov 1998 
PTB  100.00  0.11 
Static Expansion System 
28 May to 04 Jun 1998 
The laboratory individual measurements of the participants in EUROMET.M.PK1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.PK1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL PRESSURE : 300 Pa
p_{i} : corrected mean gauge reading obtained by laboratory i
u_{i} : combined standard uncertainty of p_{i}
Further information on p_{i} and u_{i} may be found respectively on page 15 and page 22 of CCM.PK4 Final Report.
Lab i  p_{i} / Pa 
u_{i} / Pa 
Measurement method 
Date of 
CSIRONML  300.57  0.16 
LiquidColumn Manometer 
24 Feb to 03 Mar 1999 
CNRIMGC  300.132  0.060 
LiquidColumn Manometer 
19 Jan to 08 Feb 1999 
KRISS  300.010  0.023 
LiquidColumn Manometer 
15 Jun to 22 Jun 1999 
NIST  299.9871  0.0054 
LiquidColumn Manometer(s) 
17 Mar to 03 Apr and 08 Jul to 24 Jul 1998, 23 Apr to 06 May and 23 Aug to 10 Sep 1999 
NPLI  299.76  0.16 
Static Expansion System 
01 Jan to 14 Jan 1999 
NPL  299.80  0.54 
Static Expansion System 
17 Nov to 25 Nov 1998 
PTB  299.92  0.32 
Static Expansion System 
28 May to 04 Jun 1998 
The laboratory individual measurements of the participants in EUROMET.M.PK1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.PK1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4 and EUROMET.M.PK1.a
MEASURAND : Pressure
NOMINAL PRESSURE : 1000 Pa
p_{i} : corrected mean gauge reading obtained by laboratory i
u_{i} : combined standard uncertainty of p_{i}
Further information on p_{i} and u_{i} may be found respectively on page 15 and page 22 of CCM.PK4 Final Report.
Lab i  p_{i} / Pa 
u_{i} / Pa 
Measurement method 
Date of 
CSIRONML  1000.33  0.16 
LiquidColumn Manometer 
24 Feb to 03 Mar 1999 
CNRIMGC  1000.178  0.061 
LiquidColumn Manometer 
19 Jan to 08 Feb 1999 
KRISS  1000.056  0.055 
LiquidColumn Manometer 
15 Jun to 22 Jun 1999 
NIST  1000.0308  0.0059 
LiquidColumn Manometer(s) 
17 Mar to 03 Apr and 08 Jul to 24 Jul 1998, 23 Apr to 06 May and 23 Aug to 10 Sep 1999 
NPLI  999.12  0.74 
Static Expansion System 
01 Jan to 14 Jan 1999 
NPL  1000.7  1.8 
Static Expansion System 
17 Nov to 25 Nov 1998 
PTB  999.7  1.1 
Static Expansion System 
28 May to 04 Jun 1998 
The laboratory individual measurements of the participants in EUROMET.M.PK1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.PK1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 800001:2009 Annex B Rule B.
CCM.PK4, EUROMET.M.PK1.a, EUROMET.M.PK1.b, SIMEUROMET.M.PBK3 and EURAMET.M.PK15.1
MEASURAND Pressure
NOMINAL VALUE 1 Pa
The initial measurement results are available in the Final Reports.