BS ISO 5168:2005
Current
The latest, up-to-date edition.
Measurement of fluid flow. Procedures for the evaluation of uncertainties
Hardcopy , PDF
English
10-08-2005
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.
| 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 |
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.
| 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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