EN 61298-2:2008

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Process measurement and control devices - General methods and procedures for
evaluating performance -- Part 2: Tests under reference conditions
Prozessmess-, -steuer- und -regelgeräte – Allgemeine Methoden und Verfahren für die
Bewertung des Betriebsverhaltens – Teil 2: Prüfungen unter Referenzbedingunge
Dispositifs de mesure et de commande de processus - Méthodes et procédures
générales d'évaluation des performances -- Partie 2: Essais dans les conditions de
référence
Ta slovenski standard je istoveten z: EN 61298-2:2008
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61298-2
NORME EUROPÉENNE
November 2008
EUROPÄISCHE NORM
ICS 25.040.40 Supersedes EN 61298-2:1995

English version
Process measurement and control devices -
General methods and procedures for evaluating performance -
Part 2: Tests under reference conditions
(IEC 61298-2:2008)
Dispositifs de mesure  Prozessmess-, -steuer- und -regelgeräte -
et de commande de processus - Allgemeine Methoden und Verfahren für
Méthodes et procédures générales die Bewertung des Betriebsverhaltens -
d'évaluation des performances - Teil 2: Prüfungen
Partie 2: Essais dans les conditions unter Referenzbedingungen
de référence (IEC 61298-2:2008)
(CEI 61298-2:2008)
This European Standard was approved by CENELEC on 2008-11-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European 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 (English, 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, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61298-2:2008 E
Foreword
The text of document 65B/686/FDIS, future edition 2 of IEC 61298-2, prepared by SC 65B, Devices &
process analysis, of IEC TC 65, Industrial-process measurement, control and automation, was submitted
to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61298-2 on 2008-11-01.
This European Standard supersedes EN 61298-2:1995.
significant changes (see Introduction).
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-11-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61298-2:2008 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 61298-2:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1)
IEC 60050-300 - International Electrotechnical Vocabulary - -
(IEV) - Electrical and electronic
measurements and measuring instruments -
Part 311: General terms relating to
measurements -
Part 312: General terms relating to electrical
measurements -
Part 313: Types of electrical measuring
instruments -
Part 314: Specific terms according to the type
of instrument
1)
IEC 60050-351 - International Electrotechnical Vocabulary - -
(IEV) -
Part 351: Control technology
1) 2)
IEC 61010-1 - Safety requirements for electrical equipment EN 61010-1 2001
for measurement, control, and laboratory + corr. June 2002
use -
Part 1: General requirements
1) 2)
IEC 61298-1 - Process measurement and control devices - EN 61298-1 2008
General methods and procedures for
evaluating performance -
Part 1: General considerations

1)
Undated reference.
2)
Valid edition at date of issue.

IEC 61298-2
Edition 2.0 2008-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Process measurement and control devices – General methods and procedures
for evaluating performance –
Part 2: Tests under reference conditions

Dispositifs de mesure et de commande de processus – Méthodes et procédures
générales d'évaluation des performances –
Partie 2: Essais dans les conditions de référence

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 25.040.40 ISBN 2-8318-1003-1
– 2 – 61298-2 © IEC:2008
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .7
4 Accuracy related factors .10
4.1 Test procedures and precautions .10
4.1.1 Selection of ranges for test.10
4.1.2 Preconditioning cycles.11
4.1.3 Number of measurement cycles and test points .11
4.1.4 Additional tests where digital inputs and outputs are provided .11
4.1.5 Measurement procedure .11
4.1.6 Processing of the measured values .12
4.1.7 Determination of accuracy related factors.12
4.1.8 Presentation of the results.16
4.2 Specific testing procedures and precautions for the determination of dead
band.16
4.2.1 Selection of ranges for test and preconditioning .16
4.2.2 Measurement procedure .16
4.2.3 Presentation of the results.17
5 Dynamic behaviour.17
5.1 General considerations.17
5.2 General testing procedures and precautions.17
5.3 Frequency response.17
5.4 Step response .18
6 Functional characteristic.18
6.1 General .18
6.2 Input resistance of an electrical device.18
6.3 Insulation of electrical devices.21
6.3.1 General considerations.21
6.3.2 Insulation resistance.21
6.3.3 Dielectric strength .22
6.4 Power consumption .22
6.4.1 Electrical power consumption .22
6.4.2 Air consumption.22
6.5 Output ripple of a device with an electrical d.c. output .23
6.6 Air flow characteristics of a pneumatic device .23
6.6.1 Initial setting up .23
6.6.2 Delivered flow Q .23
6.6.3 Exhausted flow Q .24
6.6.4 Data presentation .24
6.7 Limits of adjustments of lower range value and span.25
6.8 Switching differential .25
7 Drift .25
7.1 Start-up drift .25
7.2 Long-term drift.25

61298-2 © IEC:2008 – 3 –
Figure 1 – Error curves .15
Figure 2 – Two examples of frequency response .19
Figure 3 – Two examples of responses to a step input.20
Figure 4 – Test set-up for input resistance .21
Figure 5 – Test arrangement for measurement of airflow characteristics .23
Figure 6 – Typical air flow characteristics .24

Table 1 – Settings of span and lower range value adjustments .11
Table 2 – Number of measurement cycles and number and location of test points .12
Table 3 – Typical table of device errors .14
Table 4 – Dielectric strength test voltages .22

– 4 – 61298-2 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PROCESS MEASUREMENT AND CONTROL DEVICES –
GENERAL METHODS AND PROCEDURES
FOR EVALUATING PERFORMANCE –
Part 2: Tests under reference conditions

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. IEC collaborates closely
with the International Organization for Standard
...