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BS ISO 5168:2005

Current
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

08-10-2005

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

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

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.

Committee
CPI/30
DevelopmentNote
Supersedes 03/311039 DC and BS ISO/TR 5168 (08/2005)
DocumentType
Standard
Pages
74
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
ISO 5168:2005 Identical

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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