IEC_60746-3.pdf

INTERNATIONALSTANDARDIEC60746-3Second edition2002-06Expression of performance ofelectrochemical analyzers Part 3:Electrolytic conductivityExpression des qualits de fonctionnementdes analyseurs lectrochimiques Partie 3:Conductivit lectrolytique IEC 2002 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chQFor price,see current cataloguePRICE CODECommission Electrotechnique InternationaleInternational Electrotechnical Commission 2 60746-3 IEC:2002(E)CONTENTSFOREWORD.31Scope.52Normative references.53Definitions.54Procedure for specification.84.1Additional statements on sensor units.84.2Additional statements on electronic units.84.3Additional statements on complete analyzers.85Recommended standard values and ranges of influence quantities affecting theperformance of electronic units.86Verification of values.86.1General aspects.96.2Calibration.96.3Test solutions.96.4Test procedures.10Annex A(informative)Electrolytic conductivity values of potassium chloride calibrationsolutions and pure water.12Annex B(informative)Electrolytic conductivity values of aqueous sodium chloridesolutions.13Annex C(normative)Alternative procedures for measuring response times:delay(T10),rise(fall)(Tr,Tf)and 90%(T90)times.15Annex D(informative)Conductivity cells.16Bibliography.17Table A.1 Electrolytic conductivity values.12Table A.2 Electrolytic conductivity of pure water.12Table B.1 Conductivity of sodium chloride solutions at 18 C.13Table B.2 Temperature coefficients for low-concentration sodium chloride solutions.14Table B.3 Tentative corrections to sodium chloride solution temperature coefficients.1460746-3 IEC:2002(E)3 INTERNATIONAL ELECTROTECHNICAL COMMISSION_EXPRESSION OF PERFORMANCEOF ELECTROCHEMICAL ANALYZERS Part 3:Electrolytic conductivityFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publishes International Standards.Their preparation isentrusted to technical committees;any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work.International,governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation.The IEC collaborates closely with the InternationalOrganization for Standardization(ISO)in accordance with conditions determined by agreement between thetwo organizations.2)The formal decisions or agreements of the IEC on technical matters express,as nearly as possible,aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards,technical specifications,technical reports or guides and they are accepted by the NationalCommittees in that sense.4)In order to promote international unification,IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards.Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights.The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60746-3 has been prepared by subcommittee 65D:Analyzingequipment,of IEC technical committee 65:Industrial-process measurement and control.This second edition cancels and replaces the first edition,published in 1985,and constitutesa technical revision.This standard shall be used in conjunction with IEC 60746-1.The text of this standard is based on the following documents:FDISReport on voting65D/85/FDIS65D/87/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives,Part 3.Annex C forms an integral part of this standard.Annexes A,B and D are for information only.4 60746-3 IEC:2002(E)IEC 60746 consists of the following parts,under t