1 Developments in Metrology Ed W.B. de Leer NMi Van Swinden Laboratorium The Netherlands UNECE WP.6 Presentation 24 november 2004

2 Secondary Standards SI Measurand Measurement Result Measurement Process Primary Standard Calibrated Instruments Primary Procedure Validation, Measurement Uncertainty Traceability

3 Traceability to the SI Harmonized legal regulations Validated Measurement Methods Competence of conformity assessment bodies World Measurement System NMI´s

4 Metre Convention

5

6 BIPM Scientific centre for metrology: custodian of the kilogram and the time

7 EUROMET

8 CIPM MRA

9 Mutual recognition Mutual recognition of calibration certificates is based on 1.Results obtained in BIPM or regional key comparisons 2.Successful implementation of a quality system based on the principles of ISO/IEC and, where relevant, ISO Guide 34. The recognition of the QMS can be based on accreditation, peer evaluation or self declaration. In EUROMET, the quality system must be presented in a QS Forum.

Key Comparisons of National Standards

11 1 kg Key Comparison

12 KCDB kcdb.bipm.fr

13 KCDB

14 KCDB

15 “High Accuracy” comparisons All laboratories send a standard to the pilot laboratory  Preparation errors can now be “randomised”

16 GC-TCD results GC-TCD Results for 50,000 umol/mol CO in nitrogen 0,93 0,94 0,95 0,96 0,97 0,98 0,99 1,00 1,01 1,02 1, Concentration (umol/mol) Ratio to Control

17 GLS for GC-TCD versus Gravimetry Conclusions for 50,000  mol/mol –Std dev of residuals is 1  mol/mol (0.002% rel)- after excluding two outliers –At 50,000  mol/mol, the gravimetric values are very consistent within their stated uncertainties. k=2

18 Validation of CRMs with IDMS

19 Publication of draft VIM revision International Vocabulary in Metrology April, 2004 Revision is based on the Uncertainty Approach (UA) from the GUM. Old version is based on the error concept, which is called the Classical Approach (CA) Conflict with VIML? The comments from ISO are approximately 60 text pages Uno was not accepted as a new SI unit

20 Metrology in short

21 GUM revision ? No revision of the GUM will be published Measurement result = value + measurement uncertainty + unit 4 extensions to the GUM are in preparation First extension on Monte Carlo calculation of measurement uncertainty published as a draft version

22 Metrology and Standardization ISO –ISO (problem: definition of conformity assessment activities) –ISO (problem: impartiality question) –MU concept is fully integrated in many new standards CEN –MU concept is fully integrated in many new standards

23 Metrology and Accreditation BIPM – ILAC Certified reference materials are the link to the SI for most chemical measurements Accreditation of RM producers is now possible against ISO/IEC and ISO Guide 34 in combination Special calibrations of NMIs (very low uncertainties) Harmonization BMC and CMC Linking key comparisons to proficiency tests

24 From Cooperation to Coordination? European Research Area in Metrology (MERA) Implementing the European Research Area in Metrology (iMERA) The metrology dilemma is budget driven: –Do we serve the national needs in calibration? –Do we manage a profitable business? –Do we serve the future needs in metrology? The answer could be in coordination

25 Thank you for your attention