BS EN 60746-1-2003 Expression of performance of electrochemical analyzers - General《电化学分析仪性能的表示法 总则》.pdf

1、BRITISH STANDARD BS EN 60746-1:2003 Expression of performance of electrochemical analyzers Part 1: General The European Standard EN 60746-1:2003 has the status of a British Standard ICS 71.040; 19.040 BS EN 60746-1:2003 This British Standard was published under the authority of the Standards Policy

2、and Strategy Committee on 23 April 2003 BSI 23 April 2003 ISBN 0 580 41630 5 National foreword This British Standard is the official English language version of EN 60746-1:2003. It is identical with IEC 60746-1:2003. It supersedes BS 6438-1:1984 which is withdrawn. The UK participation in its prepar

3、ation was entrusted by Technical Committee GEL/65, Industrial Process measurement and control, to Subcommittee GEL/65/4, Process instruments for gas and liquid analysis, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secret

4、ary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalog

5、ue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the

6、 text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front

7、 cover, an inside front cover, the EN title page, pages 2 to 25 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60746-1 NORME EUROPENNE EUROPISCHE NORM Febr

8、uary 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means

9、 reserved worldwide for CENELEC members. Ref. No. EN 60746-1:2003 E ICS 71.040; 19.040 English version Expression of performance of electrochemical analyzers Part 1: General (IEC 60746-1:2003) Expression des qualits de fonctionnement des analyseurs lectrochimiques Partie 1: Gnralits (CEI 60746-1:200

10、3) Angabe zum Betriebsverhalten von elektrochemischen Analysatoren Teil 1: Allgemeines (IEC 60746-1:2003) This European Standard was approved by CENELEC on 2003-02-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europea

11、n Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (Englis

12、h, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Be

13、lgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 65D/89A/FDIS, future edition 2 of IEC 60746-1, prepared by SC 65

14、D, Analysing equipment, of IEC TC 65, Industrial-process measurement and control, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60746-1 on 2003-02-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication

15、 of an identical national standard or by endorsement (dop) 2003-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-02-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for informat

16、ion only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60746-1:2003 was approved by CENELEC as a European Standard without any modification. _ Page2 EN607461:2003CONTENTS INTROD

17、UCTION.4 1 Scope.5 2 Normative references.5 3 Terms and definitions .6 4 Comparison of IEC Standards for Specification and Evaluation 10 5 Procedure for specification .11 5.1 Specification of values and ranges 11 5.2 General.11 5.3 Performance characteristics requiring statements of rated values12 5

18、.4 Uncertainty limits to be stated for each specified range .12 5.5 Other performance characteristics.13 6 Verification of values13 6.1 General.13 6.2 Test procedures15 6.2.1 Intrinsic uncertainty.15 6.2.2 Linearity uncertainty15 6.2.3 Repeatability.15 6.2.4 Output fluctuation15 6.2.5 Drift.15 6.2.6

19、 Delay (T 10 ) and 90 % (T 90 ) response times16 6.2.7 Warm-up time16 6.2.8 Variations16 6.2.9 Primary influence quantities.17 6.2.10 Other influence quantities17 Annex A (informative) Recommended standard values of influence Quantities affecting performance from IEC 60359 .19 Annex ZA (normative) N

20、ormative references to international publications with their corresponding European publications .24 Page3 EN607461:2003 INTRODUCTION This standard specifies the statements which manufacturers should make to describe analyzers so that users may compare the performance characteristics of any analyzer

21、 to their requirements. It includes the terminology and definitions of the terms to be used in such statements. It describes the tests that are applicable to all types of electrochemical analyzers, which may be used to determine these performance characteristics by either the manufacturer or the use

22、r. This standard is applicable to electrochemical analyzers used for the determination of certain properties of (generally aqueous) solutions such as pH value, electrical conductivity, dissolved oxygen content, the concentration of specified ions and redox potential. Other standards in this series d

23、escribe those aspects that are particular to specific types of analyzer, for example IEC 60746-2. It is in accordance with the general principles set out in IEC 60359 and takes into account documents specifying methods for evaluating performance, IEC 60770 and IEC 61298. This standard is applicable

24、to analyzers specified for installation in any location and to analyzers having either flow-through or immersible type sensors. It is applicable to the complete analyzer when supplied by one manufacturer as an integral unit comprised of all mechanical, electrical and electronic portions. It also app

25、lies to sensor units alone and electronic units alone when supplied separately or by different manufacturers. For the purposes of this standard, any regulator for mains-supplied power or any non-mains power supply, provided with the analyzer or specified by the manufacturer, is considered part of th

26、e analyzer whether it is integral with the analyzer or housed separately. It does not apply to accessories used in conjunction with the analyzers, such as chart recorders or data acquisition systems. However, when multiple analyzers are combined and sold with a single electronic unit for measurement

27、s of several properties in parallel, that read-out unit is considered to be part of the analyzer. Similarly, e.m.f.-to-current or e.m.f.-to-pressure converters that are not an integral part of the analyzer are not included. Safety requirements are dealt with in IEC 61010. Standard ranges of analogue

28、 d.c. current and pneumatic signals used in process control systems are dealt within IEC 60381-1, and IEC 60382. Specifications for values of influence quantities for the testing of performance characteristics can be found in IEC 60654-1 and methods of testing in IEC 60068. Requirements for document

29、ation to be supplied with instruments are dealt with in some National Standards and also IEC 61187. General principles concerning quantities, units and symbols are dealt with in ISO 1000. See also ISO 31, Parts 0 to 13. Page4 EN607461:2003EXPRESSION OF PERFORMANCE OF ELECTROCHEMICAL ANALYZERS Part 1

30、: General 1 Scope This standard is intended: to specify the terminology and definitions of terms related to the performance charac- teristics of electrochemical analyzers used for the continuous determination of certain aspects of (generally aqueous) solutions; to specify uniform methods to be used

31、in making statements on the performance characteristics of such analyzers; to specify general test procedures to determine and verify the performance characteristics of electrochemical analyzers, taking into account the differences of approach in IEC documents specifying test methods (IEC 60359, IEC

32、 60770, IEC 61298); to provide basic documents to support the application of standards of quality assurance: ISO 9001, ISO 9002 and ISO 9003. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited

33、 applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60068-1, Environmental testing Part 1: General and guidance IEC 60359:2001, Electrical and electronic measurement equipment Expression of performance IEC 60381-1, Analogue signals

34、for process control systems Part 1: Direct current signals IEC 60382, Analogue pneumatic signal for process control systems IEC 60654-1, Industrial-process measurement and control equipment Operating conditions Part 1: Climatic conditions IEC 60770-1, Transmitters for use in industrial-process contr

35、ol systems Part 1: Methods for performance evaluation IEC 61298, (all parts): Process measurement and control devices General methods and procedures for evaluating performance ISO 9001, Quality management systems Requirements ISO 9002, Quality systems Model for quality assurance in production, insta

36、llation and servicing ISO 9003, Quality systems Model for quality assurance in final inspection and test Page5 EN607461:20033 Terms and definitions For the purposes of this standard, the following definitions apply. These definitions are based on those in IEC 60359. Additional definitions from IEC 6

37、0770 are included for performance characteristics appropriate to electrochemical analyzers. The definitions have, in some cases, been clarified and directed towards relevance to electrochemical analyzers. The reconciliation of the quantities used to define performance characteristics in this documen

38、t with those referred to in IEC 60359, IEC 60770 and IEC 61298 is discussed in clause 4. 3.1 electrochemical analyzer measuring instrument that provides an indication of a specific property of a medium by use of a sensor which responds to ions from electrolytes (or ions generated from reactions with

39、 non-electrolytes) in that medium NOTE The analyzer may comprise of separate parts, see below. 3.2 sensor that part of the electrochemical analyzer (which may be a separate unit) which is in contact with the medium in which the property is to be measured NOTE In general an electrical output related

40、to that property of the sample which is to be measured is derived from this part of the analyzer. Examples of electrochemical sensors are: pH, ion-sensitive and redox potentiometric cells, dissolved oxygen cells, conductance cells. 3.3 electronic unit device converting the electrical signal from the

41、 sensor to a defined, scaled, output signal 3.4 simulator device which provides well-defined electrical properties similar to a specific type of sensor NOTE It may therefore be used to determine the performance characteristics of the electronic unit alone. It must exhibit uncertainties that are negl

42、igible in comparison with the specifications of performance characteristics to be determined. 3.5 calibration solution solution of known value of the property being measured, used for periodic calibration and for various performance tests. NOTE 1 The value should be expressed in SI units compatible

43、with ISO 31. NOTE 2 For the purposes of this Standard, the value of this solution represents the conventional true value (see 3.8) against which the indicated value is compared. NOTE 3 The values of calibration solutions should be traceable to reference material according to international or nationa

44、l standards, or agreed upon by the manufacturer and the user, and the uncertainty of the conventional true values shall be stated. 3.6 test solution solution of approximately known value of the property being measured, which is stable in value over an extended period of time 3.7 true value value of

45、a quantity which is defined with no uncertainty. NOTE The true value of a quantity is an ideal concept and, in general, cannot be known exactly. Page6 EN607461:20033.8 conventional true value value approximating to the true value of a quantity such that, for the purpose for which that value is used,

46、 the difference between the two will be regarded as negligible NOTE 1 Since the “true value” cannot be known exactly, for the sake of simplicity and where no ambiguity exists, the term “true value” may be used where the term “conventional true value” is meant. NOTE 2 See 3.1.13 of IEC 60359. 3.9 per

47、formance characteristic one of the quantities assigned to an apparatus in order to define its performance by values, tolerances, ranges, etc. 3.10 influence quantity any quantity, which is not the subject of the measurement but which influences the indication of the measuring equipment NOTE Influenc

48、e quantities may interact in their effect on the measuring equipment. 3.11 variation difference between the values indicated by an analyzer for the same value of the property being measured when a single influence quantity assumes successively two different values 3.12 rated value value assigned to

49、a performance characteristic of the analyzer by the manufacturer NOTE See 3.3.8 of IEC 60359. 3.13 range domain between the upper and lower limits of the quantity under consideration NOTE 1 The term “range” is usually used with a modifier. It may apply to a performance characteristic or an influence quantity, etc. For example, the Rated Measuring Range is the set of values of the property to be measured, corresponding to the O