ISO INTERNATIONAL STANDARD 14912 First edition 2003-03-15 Gas analysis Conversion of gas mixture composition data Analyse des gaz - ( Conversion des données de composition de mélanges gazeux Reference number ISO 14912:2003(E) ISO @ ISO 2003 by IHS under lic itted without license from IHS Not for Resale ISO 14912:2003(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 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. ISO2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, 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 [email protected] Web www.iso.org Published in Switzerland @ ISo 2003 - All rights reserved ed without license from IHS Not for Resale ISO 14912:2003(E) Contents Page Foreword. .iv Introduction. 1 Scope 2 Terms and definitions. 3 Symbols and units . 4 Basic principles.... .6 4.1 Expressionofgasmixturecomposition.. .6 4.2 Conversion between different quantities. 8 4.3 Conversionbetweendifferentstateconditions 5 Main procedures..... 5.1 Conversion between different quantities of composition. .10 5.2 Conversion to reference conditions... 13 6 Practical implementation.. 6.1 Conversion between quantities of composition .... 6.2 Conversion of single analyte contents ... 6.3 Conversion of complete compositions.. ..15 6.4 Conversion between state conditions . 15 6.5 Simple approximations applicable to conversion .... 7 Input quantities and their uncertainties 7.1 Pure gas data.. 7.2 Gas mixture data. 19 7.3 Rough uncertainty estimates 22 8 Conversion uncertainty . .22 8.1 General considerations. 8.2 Conversion of single analyte contents .. 8.3 Conversion of complete compositions... 24 8.4 Uncertainty calculation using numerical differentiation.... 26 8.5 Variances and covariances of input composition data.... 27 9 Application recommendations..... Annex A (normative) Assessment of state conditions .... Annex B (normative) Summation relations for the expression of mixture properties . Annex C (informative) Mixture component data .... ...34 Annex D (informative) Examples .... Annex E (informative) Computer implementation of recommended methods. Bibliography.... ii ut license from IHS Not for Resale ISO 14912:2003(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 14912 was prepared by Technical Committ