ISO 5168:2005

Measurement of fluid flow — Procedures for the evaluation of uncertainties

ISO 5168:2005 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.

Mesure de débit des fluides — Procédures pour le calcul de l'incertitude

General Information

• Status: Published
• Publication Date: 14-Jun-2005
• ICS: 17.120.10 - Flow in closed conduits
• Technical Committee: ISO/TC 30 - Measurement of fluid flow in closed conduits
• Drafting Committee: ISO/TC 30 - Measurement of fluid flow in closed conduits

Relations

• Consolidated By: ISO 15254:2009 - Ophthalmic optics and instruments — Electro-optical devices for enhancing low vision
• Effective Date: 06-Jun-2022
• Revises: ISO/TR 5168:1998 - Measurement of fluid flow — Evaluation of uncertainties
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 5168
Second edition
2005-06-15


Measurement of fluid flow — Procedures
for the evaluation of uncertainties
Mesure de débit des fluides — Procédures pour le calcul de l'incertitude





Reference number
ISO 5168:2005(E)
©
ISO 2005

---------------------- Page: 1 ----------------------
ISO 5168:2005(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2005
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2005 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 5168:2005(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Symbols and abbreviated terms . 3
4.1 Symbols . 3
4.2 Subscripts . 7
5 Evaluation of the uncertainty in a measurement process. 8
6 Type A evaluations of uncertainty . 9
6.1 General considerations. 9
6.2 Calculation procedure. 9
7 Type B evaluation of uncertainties . 10
7.1 General considerations. 10
7.2 Calculation procedure. 10
7.3 Rectangular probability distribution. 10
7.4 Normal probability distribution . 11
7.5 Triangular probability distribution. 11
7.6 Bimodal probability distribution . 11
7.7 Assigning a probability distribution . 11
7.8 Asymmetric probability distributions.
...