IEC_60746-2-2003.pdf

INTERNATIONALSTANDARDIEC60746-2Second edition2003-01Expression of performance ofelectrochemical analyzers Part 2:pH valueExpression des qualits de fonctionnementdes analyseurs lectrochimiques Partie 2:Mesure du pHReference numberIEC 60746-2:2003(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.Publication numberingAs from 1 January 1997 all IEC publications are issued with a designation in the60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editionsThe IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,thebase publication incorporating amendment 1 and the base publication incorporatingamendments 1 and 2.Further information on IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating tothis publication,including its validity,is available in the IEC Catalogue ofpublications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertakenby the technical committee which has prepared this publication,as well as the listof publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publicationsThe on-line catalogue on the IEC web site(http:/www.iec.ch/searchpub/cur_fut.htm)enables you to search by a variety of criteria including text searches,technicalcommittees and date of publication.On-line information is also available onrecently issued publications,withdrawn and replaced publications,as well ascorrigenda.IEC Just Published This summary of recently issued publications(http:/www.iec.ch/online_news/justpub/jp_entry.htm)is also available by email.Please contact the CustomerService Centre(see below)for further information.Customer Service CentreIf you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONALSTANDARDIEC60746-2Second edition2003-01Expression of performance ofelectrochemical analyzers Part 2:pH valueExpression des qualits de fonctionnementdes analyseurs lectrochimiques Partie 2:Mesure du pH IEC 2003 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.chSFor price,see current cataloguePRICE CODECommission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60746-2 IEC:2003(E)CONTENTSFOREWORD.41Scope.62Normative reference.63Definitions.64Procedure for specification.84.1Additional statements on sensor units and analyzers.94.2Additional statements on electronic units.94.3Statements on sensors.104.3.1General.104.3.2Reference electrodes.104.3.3pH sensor.104.3.4Temperature compensator.104.3.5Auxiliary devices for sensor unit.105Recommended standard values and ranges of influence quantities affecting theperformance of electronic units.116Verification of values.116.1General aspects.116.2Test procedures for electronic units.116.2.1pH scaling.116.2.2Isopotential pH,pHi.126.2.3Temperature compensation.126.3Test procedures for sensor units.126.3.1Zero point pH.126.3.2Percentage theoretical slope,PTS.126.3.3Isopotential pH,pH i.126.4Test procedures for analyzers.126.4.1Intrinsic uncertainty.136.4.2Linearity uncertainty.136.4.3Repeatability.136.4.4Output fluctuation.136.4.5Warm-up time.136.4.6Drift.136.4.7Response times.136.4.8Sample temperature.136.4.9Primary influence quantities.13Bibliography.21Annex A(informative).15Annex B(informative)Reference buffer solutions:pH as a function of temperature.16Annex C(normative)Alternative procedures for measuring response times:delay(T10),rise(fall)(Tr,Tf)and 90%(T90)times.19LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60746-2 IEC:2003(E)3 Figure C.1 Relation between T10,Tr(Tf)and T90.19Table A.1 Values of the slope factor,k=2,3026 R.T/F.15Table B.1 Values of reference pH buffer solutions at various temperatures.17Table B.2 Composition of reference pH buffer solutions.18LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.4 60746-2 IEC:2003(E)INTERNATIONAL ELECTROTECHNICAL COMMISSION_EXPRESSION OF