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Developments in Metrology

Developments in Metrology. Ed W.B. de Leer NMi Van Swinden Laboratorium The Netherlands. UNECE WP.6 Presentation 24 november 2004. Measurement Process. Measurand. Validation, Measurement Uncertainty. SI. Primary Procedure. Primary Standard. Secondary Standards.

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Developments in Metrology

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

  2. Measurement Process Measurand Validation, Measurement Uncertainty SI PrimaryProcedure PrimaryStandard Secondary Standards Calibrated Instruments Traceability Measurement Result

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

  4. Metre Convention

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

  6. EUROMET

  7. CIPM MRA

  8. Mutual recognition Mutual recognition of calibration certificates is based on • Results obtained in BIPM or regional key comparisons • Successful implementation of a quality system based on the principles of ISO/IEC 17025 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.

  9. Key Comparisons of National Standards

  10. 1 kg Key Comparison

  11. KCDB kcdb.bipm.fr

  12. KCDB

  13. KCDB

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

  15. GC-TCD results GC-TCD Results for 50,000 umol/mol CO in nitrogen 1,03 1,02 1,01 1,00 0,99 Ratio to Control 0,98 0,97 0,96 0,95 0,94 0,93 47000 47500 48000 48500 49000 49500 50000 50500 51000 51500 52000 52500 Concentration (umol/mol)

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

  17. Validation of CRMs with IDMS

  18. Publication of draft VIM revision • International Vocabulary in MetrologyApril, 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

  19. Metrology in short

  20. 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

  21. Metrology and Standardization • ISO • ISO 17000 (problem: definition of conformity assessment activities) • ISO 17010 (problem: impartiality question) • MU concept is fully integrated in many new standards • CEN • MU concept is fully integrated in many new standards

  22. 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 17025 and ISO Guide 34 in combination • Special calibrations of NMIs (very low uncertainties) • Harmonization BMC and CMC • Linking key comparisons to proficiency tests

  23. 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

  24. Thank you for your attention

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