IEC 60746-1:2003

INTERNATIONAL IEC
STANDARD
60746-1
Second edition
2003-01
Expression of performance of
electrochemical analyzers –
Part 1:
General
Expression des qualités de fonctionnement
des analyseurs électrochimiques –
Partie 1:
Généralités
Reference number
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INTERNATIONAL IEC
STANDARD
60746-1
Second edition
2003-01
Expression of performance of
electrochemical analyzers –
Part 1:
General
Expression des qualités de fonctionnement
des analyseurs électrochimiques –
Partie 1:
Généralités
 IEC 2003  Copyright - all rights reserved
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– 2 – 60746-1  IEC:2003(E)
CONTENTS
FOREWORD . 3
INTRODUCTION .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 values .12
5.4 Uncertainty limits to be stated for each specified range .12
5.5 Other performance characteristics .13
6 Verification of values .13
6.1 General .13
6.2 Test procedures.15
6.2.1 Intrinsic uncertainty.15
6.2.2 Linearity uncertainty.15
6.2.3 Repeatability.15
6.2.4 Output fluctuation .15
6.2.5 Drift .15
6.2.6 Delay (T ) and 90 % (T ) response times .16
10 90
6.2.7 Warm-up time .16
6.2.8 Variations .16
6.2.9 Primary influence quantities.17
6.2.10 Other influence quantities .17
Annex A (informative) Recommended standard values of influence –
Quantities affecting performance from IEC 60359 .19

60746-1  IEC:2003(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
EXPRESSION OF PERFORMANCE OF
ELECTROCHEMICAL ANALYZERS –
Part 1: General
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment 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 subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60746-1 has been prepared by subcommittee 65D: Analysing
equipment, of IEC technical committee 65: Industrial-process measurement and control.
This second edition cancels and replaces the first edition published in 1982 and constitutes
a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
65D/89A/FDIS 65D/93/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
For this second edition, the text has been changed to reflect revision and introduction of Inter-
national Standards since 1982. An Informative Annex A has been introduced.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
2007. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 60746-1  IEC:2003(E)
INTRODUCTION
This standard specifies the statements which manufacturers should make to describe
analyzers so that users may compare the performance characteristics of any analyzer 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 user.
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 describe 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 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 applies 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 the
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 measurements 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 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 documentation 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.

60746-1  IEC:2003(E) – 5 –
EXPRESSION OF PERFORMANCE OF
ELECTROCHEMICAL ANALYZERS –
Part 1: 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 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 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 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 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 control 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, installation and
servicing
ISO 9003, Quality systems – Model for quality assurance in final inspection and test

– 6 – 60746-1  IEC:2003(E)
3 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 60770 are included for performance
characteristics appropriate t
...