IEC 60746-3:2002

Expression of performance of electrochemical analyzers - Part 3: Electrolytic conductivity

IEC 60746-3:2002 is intended to specify terminology, definitions and requirements for statements by manufacturers for analyzers, sensor units, and electronic units used for the determination of the electrolytic conductivity of aqueous solutions; to establish performance tests for such analyzers, sensor units and electronic units; to provide basic documents to support the applications of quality assurance standards.
This publication is to be read in conjunction with IEC 60746-1:2003.

Expression des qualités de fonctionnement des analyseurs électrochimiques - Partie 3: Conductivité électrolytique

La CEI 60746-3:2002 a pour but de spécifier la terminologie, les définitions et les exigences relatives aux énoncés des caractéristiques par les constructeurs d'analyseurs, de détecteurs et d'unités électroniques utilisés pour la détermination de la conductivité électrolytique des solutions aqueuses; d'établir les essais de qualité de fonctionnement pour ces analyseurs, détecteurs et unités électroniques; de fournir des documents de base dans le cadre de l'application des normes d'assurance qualité.
Cette publication doit être lue conjointement avec la CEI 60746-1:2003.

General Information

• Status: Published
• Publication Date: 23-Jun-2002
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.020 - Metrology and measurement in general
• ICS: 71.040.40 - Chemical analysis
• Technical Committee: SC 65B - Measurement and control devices
• Drafting Committee: WG 14 - TC 65/SC 65B/WG 14
• Current Stage: PPUB - Publication issued
• Start Date: 15-Aug-2002
• Completion Date: 24-Jun-2002

Relations

• Corrected By: IEC 60746-3:2002/COR1:2003 - Corrigendum 1 - Expression of performance of electrochemical analyzers - Part 3: Electrolytic conductivity
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
60746-3
Second edition
2002-06
Expression of performance of
electrochemical analyzers –
Part 3:
Electrolytic conductivity
Expression des qualités de fonctionnement
des analyseurs électrochimiques –
Partie 3:
Conductivité électrolytique
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The 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, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
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INTERNATIONAL IEC
STANDARD
60746-3
Second edition
2002-06
Expression of performance of
electrochemical analyzers –
Part 3:
Electrolytic conductivity
Expression des qualités de fonctionnement
des analyseurs électrochimiques –
Partie 3:
Conductivité électrolytique
 IEC 2002  Copyright - all rights reserved
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 Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail]  Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
Q
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60746-3  IEC:2002(E)
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Definitions .5
4 Procedure for specification .8
4.1 Additional statements on sensor units .8
4.2 Additional statements on electronic units.8
4.3 Additional statements on complete analyzers .8
5 Recommended standard values and ranges of influence quantities affecting the
performance of electronic units.8
6 Verification of values .8
6.1 General aspects .9
6.2 Calibration.9
6.3 Test solutions.9
6.4 Test procedures .10
Annex A (informative) Electrolytic conductivity values of potassium chloride calibration
solutions and pure water.12
Annex B (informative) Electrolytic conductivity values of aqueous sodium chloride
solutions .13
Annex C (normative) Alternative procedures for measuring response times: delay
(T ), rise (fall) (T , T ) and 90 % (T ) times .15
10 r f 90
Annex D (informative) Conductivity cells .16
Bibliography.17
Table A.1 – Electrolytic conductivity values.12
Table A.2 – Electrolytic conductivity of pure water .12
Table B.1 – Conductivity of sodium chloride solutions at 18 °C .13
Table B.2 – Temperature coefficients for low-concentration sodium chloride solutions .14
Table B.3 – Tentative corrections to sodium chloride solution temperature coefficients.14

60746-3  IEC:2002(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPRESSION OF PERFORMANCE
OF ELECTROCHEMICAL ANALYZERS –
Part 3: Electrolytic conductivity
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 60746-3 has been prepared by subcommittee 65D: Analyzing
equipment, of IEC technical committee 65: Industrial-process measurement and control.
This second edition cancels and replaces the first edition, published in 1985, and constitutes
a technical revision.
This standard shall be used in conjunction with IEC 60746-1.
The text of this standard is based on the following documents:
FDIS Report on voting
65D/85/FDIS 65D/87/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.
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 the general title Expression of performance
of electrochemical analyzers:
Part 1: General
Part 2: pH value
Part 3: Electrolytic conductivity
Part 4: Dissolved oxygen in water measured by membrane covered amperometric sensors
Part 5: Oxidation-reduction potential or redox potential
1)
Part 6: Conductivity effect of foreign ions in ultrapure waters, from combined conductivity and pH
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.
A bilingual version of this publication may be issued at a later date.
The contents of the corrigendum of January 2003 have been included in this copy.
________
1)
Under consideration.
60746-3  IEC:2002(E) – 5 –
EXPRESSION OF PERFORMANCE
OF ELECTROCHEMICAL ANALYZERS –
Part 3: Electrolytic conductivity
1 Scope
This part of IEC 60746 is intended
– to specify terminology, definitions and requirements for statements by manufacturers for
analyzers, sensor units, and electronic units used for the determination of the electrolytic
conductivity of aqueous solutions;
– to establish performance tests for such analyzers, sensor units and electronic units;
– to provide basic documents to support the applications of quality assurance standards.
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 60746-1, Expression of performance of electrochemical analyzers – Part 1: General
3 Definitions
For the purpose of this part of IEC 60746, the definitions of IEC 60746-1 apply, together with
the following definitions.
3.1
electrolytic conductance
current divided by the potential difference in the case of ionic charge transport within an
electrolytic solution filling a conductivity cell:
I
G =
U
where
I is the current through the electrolyte, in amperes (A);
U is the potential difference applied across the electrodes, in volts (V);
G is the electrolytic conductance, in siemens (S).
Electrolytic resistance is the reciprocal of electrolytic conductance with the ohm (Ω) as the
unit of measurement
– 6 – 60746-3  IEC:2002(E)
3.2
electrolytic conductivity
formerly called specific conductance, is defined by the equation:
j
κ =
E
where
–2
j is the electric current density, in A⋅m ;
–1
E is the electric field strength, in V⋅m .
–1
The unit of electrolytic conductivity, κ, is siemens per metre (S⋅m ). Electrolytic resistivity is
the reciprocal of electrolytic conductivity with the unit of ohmmeter (Ω⋅m)
–1
NOTE In practical use, the most commonly employed conductivity unit is microsiemens per centimetre (μS⋅cm )
.
or the corresponding resistivity unit, megohm per centimetre (MΩ cm)
–1 –4 –1
1 μS⋅cm = 10 S⋅m = 1 MΩ⋅cm.
3.3
cell constant of the sensor unit
an electrolytic conductor of a uniform cross-section X and length L is defined by the equation:
L
κ =
cell
X
–1
where K is the cell constant, in m (see Note 1).
cell
It is usual to measure electrolytic conductivity by means of cells without a uniform cross-
section, in which case the K should be determined by means of a reference solution of
cell
known electrolytic conductivity.
The relationship between electrolytic conductance and electrolytic conductivity is defined by
the equation:
κ = K × G
cell
where
–1
κ is the electrolytic conductivity, in S⋅m ;
G is the electrolytic conductance, in S;
–1
K is the cell constant, in m .
cell
–1 –1
NOTE 1 In practical use, K is generally expressed in cm , κ in μS⋅cm and G in μS (see 3.2).
cell
NOTE 2 The cell constant will normally have a constant value over a stated range (see 4.1). Outside this range, it
should be expected that polarization or other effects will produce errors (see 3.4 and annex D).
3.4
polarization
effect which occurs at electrode surfaces in an electrolytic solution when the current between
the electrodes is such as to produce electrolysis and consequent partial insulation of the
electrode surface
To avoid this uncertainty, different measuring methods can be applied (see 3.7, 3.8 and
annex D):
a) a.c. measurements with a frequency high enough to avoid polarization effects;
b) four or six electrode measurements with separated current transporting and potential
measuring electrodes;
c) inductive or capacitive measurements by coupling between the electrolytic conductor and
the electrical measuring circuit through non-conductive media.

60746-3  IEC:2002(E) – 7 –
In each case, the relationship between the electrolytic conductivity and the measured output
quantity is established by the cell constant.
3.5
temperature coefficient
relative increase (or decrease) of the electrolytic conductivity of a solution per kelvin
temperature change. The temperature coefficient is dependent on the reference temperature
and the nature of the solution.
The fol
...

IEC 60746-3 ®
Edition 2.0 2002-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Expression of performance of electrochemical analyzers –
Part 3: Electrolytic conductivity

Expression des qualités de fonctionnement des analyseurs électrochimiques –
Partie 3: Conductivité électrolytique

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IEC 60746-3 ®
Edition 2.0 2002-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Expression of performance of electrochemical analyzers –

Part 3: Electrolytic conductivity

Expression des qualités de fonctionnement des analyseurs électrochimiques –

Partie 3: Conductivité électrolytique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
Q
CODE PRIX
ICS 17.020; 71.040 ISBN 978-2-83220-536-5

– 2 – 60746-3  IEC:2002
CONTENTS
FOREWORD . 3

1 Scope . 5
2 Normative references . 5
3 Definitions . 5
4 Procedure for specification . 8
4.1 Additional statements on sensor units . 8
4.2 Additional statements on electronic units . 8
4.3 Additional statements on complete analyzers . 8
5 Recommended standard values and ranges of influence quantities affecting the
performance of electronic units . 8
6 Verification of values . 8
6.1 General aspects . 9
6.2 Calibration . 9
6.3 Test solutions . 9
6.4 Test procedures . 10

Annex A (informative) Electrolytic conductivity values of potassium chloride calibration
solutions and pure water . 12
Annex B (informative) Electrolytic conductivity values of aqueous sodium chloride
solutions . 13
Annex C (normative) Alternative procedures for measuring response times: delay
(T ), rise (fall) (T , T ) and 90 % (T ) times . 15
10 r f 90
Annex D (informative) Conductivity cells . 16

Bibliography . 17

Table A.1 – Electrolytic conductivity values . 12
Table A.2 – Electrolytic conductivity of pure water . 12
Table B.1 – Conductivity of sodium chloride solutions at 18 °C . 13
Table B.2 – Temperature coefficients for low-concentration sodium chloride solutions . 14
Table B.3 – Tentative corrections to sodium chloride solution temperature coefficients . 14

60746-3  IEC:2002 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPRESSION OF PERFORMANCE
OF ELECTROCHEMICAL ANALYZERS –

Part 3: Electrolytic conductivity

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 60746-3 has been prepared by subcommittee 65D: Analyzing
equipment, of IEC technical committee 65: Industrial-process measurement and control.
This second edition cancels and replaces the first edition, published in 1985, and constitutes
a technical revision.
This standard shall be used in conjunction with IEC 60746-1.
This bilingual version (2012-12) corresponds to the monolingual English version, published in
2002-06.
The text of this standard is based on the following documents:
FDIS Report on voting
65D/85/FDIS 65D/87/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.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annex C forms an integral part of this standard.

– 4 – 60746-3  IEC:2002
Annexes A, B and D are for information only.
IEC 60746 consists of the following parts, under the general title Expression of performance
of electrochemical analyzers:
Part 1: General
Part 2: pH value
Part 3: Electrolytic conductivity
Part 4: Dissolved oxygen in water measured by membrane covered amperometric sensors
Part 5: Oxidation-reduction potential or redox potential
1)
Part 6: Conductivity effect of foreign ions in ultrapure waters, from combined conductivity and pH
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.
The contents of the corrigendum of January 2003 have been included in this copy.

________
1)
Under consideration.
60746-3  IEC:2002 – 5 –
EXPRESSION OF PERFORMANCE
OF ELECTROCHEMICAL ANALYZERS –

Part 3: Electrolytic conductivity

1 Scope
This part of IEC 60746 is intended
– to specify terminology, definitions and requirements for statements by manufacturers for
analyzers, sensor units, and electronic units used for the determination of the electrolytic
conductivity of aqueous solutions;
– to establish performance tests for such analyzers, sensor units and electronic units;
– to provide basic documents to support the applications of quality assurance standards.
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 60746-1, Expression of performance of electrochemical analyzers – Part 1: General
3 Definitions
For the purpose of this part of IEC 60746, the definitions of IEC 60746-1 apply, together with
the following definitions.
3.1
electrolytic conductance
current divided by the potential difference in the case of ionic charge transport within an
electrolytic solution filling a conductivity cell:
I
G =
U
where
I is the current through the electrolyte, in amperes (A);
U is the potential difference applied across the electrodes, in volts (V);
G is the electrolytic conductance, in siemens (S).
Electrolytic resistance is the reciprocal of electrolytic conductance with the ohm (Ω) as the
unit of measurement
–
...