Developments in Metrology

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Developments in Metrology

• Ed W.B. de Leer
• NMi Van Swinden Laboratorium
• The Netherlands

UNECE WP.6 Presentation 24 november 2004
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Measurement Process
Measurand
Validation, Measurement Uncertainty
SI
Secondary Standards
PrimaryStandard
Calibrated Instruments
PrimaryProcedure
Measurement Result
Traceability
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World Measurement System
Harmonized legal regulations
Validated Measurement Methods
World Measurement System
Competence of conformity assessment bodies
Traceability to the SI
NMIs
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Metre Convention
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(No Transcript)
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BIPM
Scientific centre for metrology custodian of the
kilogram and the time
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EUROMET
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CIPM MRA
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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.

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Key Comparisons of National Standards
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1 kg Key Comparison
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KCDB
kcdb.bipm.fr
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KCDB
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KCDB
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High Accuracy comparisons

• Preparation errors can now be randomised

• All laboratories send a standard to the pilot
  laboratory

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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)
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GLS for GC-TCD versus Gravimetry
k2

• 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.

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Validation of CRMs with IDMS
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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

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Metrology in short
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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

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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

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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

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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

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Thank you for your attention