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International Organization for International Organization for StandardizationStandardization
Official members are National StandardOfficial members are National Standard’’s s organizationsorganizations
••ANSI ANSI ––
American National Standards InstituteAmerican National Standards Institute••BIS BIS ––
Bureau of Indian StandardsBureau of Indian Standards
••BSI BSI ––
British Standards InstitutionBritish Standards Institution••DIN DIN ––
German Institute of StandardizationGerman Institute of Standardization
164 Participating and Observing Countries164 Participating and Observing Countries3,368 Technical Committees and groups3,368 Technical Committees and groups
224 Technical Committees224 Technical Committees513 Subcommittees513 Subcommittees2,500 working groups2,500 working groups
Vienna agreement with CENVienna agreement with CEN
•• 19,500 Standards and Technical 19,500 Standards and Technical ReportsReports
•• 1,500 new projects registered in 1,500 new projects registered in 20122012
18 participating countries18 participating countries19 observing countries19 observing countries70 standards and technical 70 standards and technical
reportsreports
SC 1SC 1
Velocity area methodVelocity area methodSC 2SC 2
Flow measurement structuresFlow measurement structures
SC 5SC 5
Instruments, equipment and data Instruments, equipment and data managementmanagement
SC 6SC 6
Sediment transportSediment transportSC 8SC 8
Ground waterGround water
•• Dilution methodsDilution methods•• Vocabulary and symbolsVocabulary and symbols•• UncertaintyUncertainty
19 participating countries 28 observing countries44 standards
20 participating countries 29 observing countries93 standards and TRs
Product of a joint working group consisting of experts nominated by the:
Bureau International des Poids et Mesures (BIPM) International Electrotechnical Commission (IEC)
International Organization for Standardization (ISO) International Organization of Legal Metrology
(OIML)
GUIDE TO THEEXPRESSION OF UNCERTAINTY
IN MEASUREMENT
ISO 1088:2007, Collection and processing of data for determination of uncertainties in flow
measurement
ISO/TS 25377:2007, Hydrometric uncertainty guidance (HUG)
ISO 5168: 2005, Procedures for the evaluation of uncertainties
ISO/TR 7066‐1: 1997, Assessment of uncertainty in calibration and use of flow measurement
devices ‐‐
Part 1: Linear calibration relationships
ISO 7066‐2: 1998, Part 2: Non‐linear calibration relationships
ISO 5725‐2: 1994, Accuracy (trueness and precision) of
measurement methods and results ‐‐
Part 2: Basic method for the
determination of repeatability and reproducibility of a standard
measurement method
ISO/TR 13587:2012, Three statistical approaches for the assessment
and interpretation of measurement uncertainty
ISO 21748:2010, Guidance for the use of repeatability,
reproducibility and trueness estimates in measurement uncertainty
estimation