STD.IS0 14111-ENGL 1997 E0bsgh 12E hh6690 INTERNATIONAL ISO STANDARD 14111 First edition 1997-03-15 Natural gas - Guidelines to traceability in analysis Gaz naturel Lignes directrices pour la tragabilite en analyse Organization for Standardization (ISo) Copyright License number IHS/IcC/1996. Not for resale. No part of these 1sO documents may be reproduced in any form, electronic retrieval system or otherwise, except as aliowed in the copyright law of the country of use, or with the prior written consent of IsO (Case postale 56, 1211 Geneva 20, Switzerland, Fax +41 22 7341079),IHS or theISo Licensor'smembers. ISO Reference number ISO 14111:1997(E) Copyright International Organization for Standardization Not for Resale 4851903 0699145 206 STD.ISO 14I1I-ENGL 1997 ISO14111:1997(E) Contents Page 1 Scope 1 2 Normative references 1 3 Definitions 2 4 Fundamental principles of metrological traceability 4 5 Elaborationofthetraceabilityconcept 6 6 Chemical composition and the SI system 7 7 Traceability in natural-gas analysis . 10 8 Hierarchy of reference gas mixtures 13 9 Roleoftraceabilityinuncertaintyassessment 16 10 Implementation of traceability in International Standards for natural-gas analysis 17 11 Examples 19 12 Summary 21 Annexes A Supplementary terms and definitions 23 Example of typical interlaboratory test results 26 C Bibliography 28 1SO1997 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 the publisher. International Organization for Standardization Case postale 56. CH-1211 Geneve 20 - Switzerland Internet: central@iso.ch X.400: C=ch; a=400net; p=iso; 0=isocs; S=central Printed in Switzerland Copyright international Organization for Standardization thout license from IHS Not for Resale STD.IS0 14111-ENGL 1997 EO6TSah 2hT 9hT6690 8 一 @ ISO ISO 14111:1997(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 represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approvai by at least 75 % of the member bodies casting a vote. International Standard ISO 14111 was prepared by Technical Committee ISO/TC 193, Natural gas, Subcommittee SC 1, Analysis of natural gas. Annexes A to C of this International Standard are for information only I!! Copyright International Organization for Standardization networking permitted without license from IHS Not for Resale