• BS ISO 5168:2005

    Current The latest, up-to-date edition.

    Measurement of fluid flow. Procedures for the evaluation of uncertainties

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  10-08-2005

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    Introduction
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Symbols and abbreviated terms
       4.1 Symbols
       4.2 Subscripts
    5 Evaluation of the uncertainty in a measurement process
    6 Type A evaluations of uncertainty
       6.1 General considerations
       6.2 Calculation procedures
    7 Type B evaluation of uncertainties
       7.1 General considerations
       7.2 Calculation procedure
       7.3 Rectangular probability distribution
       7.4 Normal probability distribution
       7.5 Triangular probability distribution
       7.6 Bimodal probability distribution
       7.7 Assigning a probability distribution
       7.8 Asymmetric probability distributions
    8 Sensitivity coefficients
       8.1 General
       8.2 Analytical solution
       8.3 Numerical solution
    9 Combination of uncertainties
    10 Expression of results
       10.1 Expanded uncertainty
       10.2 Uncertainty budget
    Annex A (normative) Step-by-step procedure for calculating uncertainty
    Annex B (normative) Probability distributions
    Annex C (normative) Coverage factors
    Annex D (informative) Basic statistical concepts for use in
                          Type A assessments of uncertainty
    Annex E (informative) Measurement uncertainty sources
    Annex F (informative) Correlated input variables
    Annex G (informative) Examples
    Annex H (informative) The calibration of a flow meter on a
                          calibration rig
    Annex I (informative) Type A and Type B uncertainties in
                          relation to contributions to uncertainty
                          from "random" and "systematic" sources of
                          uncertainty
    Annex J (informative) Special situations using two or more meters
                          in parallel
    Annex K (informative) Alternative technique for uncertainty analysis
    Bibliography

    Abstract - (Show below) - (Hide below)

    Specifies a general principles and describes procedures for evaluating the uncertainty of a fluid flow-rate or quantity.

    Scope - (Show below) - (Hide below)

    This International Standard establishes general principles and describes procedures for evaluating the uncertainty of a fluid flow-rate or quantity.

    A step-by-step procedure for calculating uncertainty is given in Annex A.

    General Product Information - (Show below) - (Hide below)

    Committee CPI/30
    Development Note Supersedes 03/311039 DC and BS ISO/TR 5168 (08/2005)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 748:2007 Hydrometry Measurement of liquid flow in open channels using current-meters or floats
    ISO 7066-2:1988 Assessment of uncertainty in the calibration and use of flow measurement devices — Part 2: Non-linear calibration relationships
    ISO 9300:2005 Measurement of gas flow by means of critical flow Venturi nozzles
    ISO/TR 5168:1998 Measurement of fluid flow Evaluation of uncertainties
    ISO 5167-2:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 2: Orifice plates
    ISO 5167-1:2003 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements
    ISO/TR 7066-1:1997 Assessment of uncertainty in calibration and use of flow measurement devices — Part 1: Linear calibration relationships
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