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SIST EN 61298-1:2009
01-september-2009
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SIST EN 61298-1:1998
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Process measurement and control devices - General methods and procedures for
evaluating performance -- Part 1: General considerations
Prozessmess-, -steuer- und -regelgeräte – Allgemeine Methoden und Verfahren für die
Bewertung des Betriebsverhaltens – Teil 1: Allgemeine Betrachtungen
Dispositifs de mesure et de commande de processus - Méthodes et procédures
générales d'évaluation des performances -- Partie 1: Généralités
Ta slovenski standard je istoveten z: EN 61298-1:2008
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
SIST EN 61298-1:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61298-1:2009
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SIST EN 61298-1:2009
EUROPEAN STANDARD
EN 61298-1
NORME EUROPÉENNE
November 2008
EUROPÄISCHE NORM
ICS 25.040.40 Supersedes EN 61298-1:1995
English version
Process measurement and control devices -
General methods and procedures for evaluating performance -
Part 1: General considerations
(IEC 61298-1:2008)
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 1: Allgemeine Betrachtungen
Partie 1: Généralités (IEC 61298-1:2008)
(CEI 61298-1:2008)
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 61298-1:2008 E
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SIST EN 61298-1:2009
EN 61298-1:2008 - 2 -
Foreword
The text of document 65B/685/FDIS, future edition 2 of IEC 61298-1, 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 61298-1 on 2008-11-01.
This European Standard supersedes EN 61298-1:1995.
EN 61298-1:2008 is a general revision with respect to EN 61298-1:1995 and does not include any
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 61298-1:2008 was approved by CENELEC as a European
Standard without any modification.
__________
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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
IEC 60410 1973 Sampling plans and procedures - -
for inspection by attributes
1) 2)
IEC 61298-2 - Process measurement and control devices - EN 61298-2 2008
General methods and procedures for
evaluating performance -
Part 2: Tests under reference conditions
1) 2)
IEC 61298-4 - Process measurement and control devices - EN 61298-4 2008
General methods and procedures for
evaluating performance -
Part 4: Evaluation report content
ISO 31 Series Quantities and units - -
1)
Undated reference.
2)
Valid edition at date of issue.
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SIST EN 61298-1:2009
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SIST EN 61298-1:2009
IEC 61298-1
Edition 2.0 2008-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Process measurement and control devices – General methods and procedures
for evaluating performance –
Part 1: General considerations
Dispositifs de mesure et de commande de processus – Méthodes et procédures
générales d'évaluation des performances –
Partie 1: Généralités
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
Q
CODE PRIX
ICS 25.040.40 ISBN 2-8318-1003-0
Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .7
4 Test categories.9
5 General criteria .9
5.1 Realistic operating conditions.9
5.2 Economic aspects .10
5.3 Replication of the tests and comparability of the results .10
5.3.1 Standardization of test methods .10
5.3.2 Influence factors.10
5.3.3 Documentation of the test methods.10
5.4 Processing the results .10
5.5 Independence of the results of a test from the effects of other tests .10
6 General conditions for tests and samples .11
6.1 Environmental test conditions.11
6.1.1 Recommended limits of ambient conditions for test measurements.11
6.2 Supply conditions .11
6.2.1 Reference values.11
6.2.2 Tolerances .11
6.3 Load conditions .12
6.4 Mounting position .12
6.5 Externally induced vibrations.12
6.6 External mechanical constraints .12
6.7 Selection .13
6.7.1 Criteria .13
6.7.2 Selection procedures.13
6.8 Delivery of the devices .13
6.9 Identification and inspection .13
7 General testing procedures and precautions.13
7.1 Test laboratory .13
7.2 Preparation for the tests .14
7.3 Choice of reference measuring equipment.14
7.3.1 Criteria .14
7.3.2 Uncertainty of the measuring system .14
7.3.3 Traceability.14
7.4 Input variable quality .14
7.5 Tapping.15
7.6 Checking of calibration made as delivered.15
7.7 Sequence of tests .15
7.8 Interruption and duration of each series of measurements.15
7.9 Anomalies and failures during tests .15
7.9.1 General .15
7.9.2 Procedures.15
7.10 Re-start of a test .15
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7.11 Setting of adjustments.16
7.12 Preconditioning .16
7.12.1 Criteria .16
7.12.2 Procedure.16
7.13 Calibration adjustments of lower range value and span .16
7.14 Constancy of the operating conditions and settings .16
7.15 Input/output variable relationships .16
7.15.1 Criteria .16
7.15.2 Procedure.16
7.16 Error assessment .17
7.17 Symbols and units of measurement .17
7.18 Test report and documentation .17
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PROCESS MEASUREMENT AND CONTROL DEVICES –
GENERAL METHODS AND PROCEDURES FOR
EVALUATING PERFORMANCE –
Part 1: General considerations
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 Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61298-1 has been prepared by subcommittee 65B: Devices and
process analysis, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 1995 and constitutes a
technical revision.
This edition is a general revision with respect to the previous edition and does not include any
significant changes (see Introduction).
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The text of this standard is based on the following documents:
FDIS Report on voting
65B/685/FDIS 65B/693/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 2.
A list of all parts of the IEC 61298 series, under the general title Process measurement and
control devices – General methods and procedures for evaluating performance, can be found
on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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INTRODUCTION
This standard is not intended as a substitute for existing standards, but is rather intended as a
reference document for any future standards developed within the IEC or other standards
organizations, concerning the evaluation of process instrumentation. Any revision of existing
standards should take this standard into account.
This common standardized basis should be utilized for the preparation of future relevant
standards, as follows:
– any test method or procedure, already treated in this standard, should be specified and
described in the new standard by referring to the corresponding clause of this standard.
Consequently new editions of this standard are revised without any change in numbering
and scope of each clause;
– any particular method or procedure, not covered by this standard, should be developed
and specified in the new standard in accordance with the criteria, as far as they are
applicable, stated in this standard;
– any conceptual or significant deviation from the content of this standard, should clearly be
identified and justified if introduced in a new standard.
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61298-1 © IEC:2008 – 7 –
PROCESS MEASUREMENT AND CONTROL DEVICES –
GENERAL METHODS AND PROCEDURES FOR
EVALUATING PERFORMANCE –
Part 1: General considerations
1 Scope
This part of IEC 61298 specifies general methods and procedures for conducting tests, and
reporting on the functional and performance characteristics of process measurement and
control devices. The methods and procedures specified in this standard are applicable to any
type of process measurement and control device. The tests are applicable to any such
devices characterized by their own specific input and output variables, and by the specific
relationship (transfer function) between the inputs and outputs, and include analogue and
digital devices. For devices that require special tests, this standard should be used, together
with any product specific standard specifying special tests.
This standard covers general principles which apply to the series.
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 60050-300, International Electrotechnical Vocabulary (IEV) – Electrical and electronic
measurements and measuring instruments (composed of Part 311, 312, 313 and 314)
IEC 60050-351, International Electrotechnical Vocabulary (IEV) – Part 351: Control
technology
IEC 60410:1973, Sampling plans and procedures for inspection by attributes
IEC 61298-4, Process measurement and control devices – General methods and procedures
for evaluating performance – Part 4: Evaluation report content
IEC 61298-2, Process measurement and control devices – General methods and procedures
for evaluating performance – Part 2: Tests under reference conditions
ISO 31 (all parts), Quantities and units
3 Terms and definitions
For the purpose of this document, the following relevant terms and definitions, some of them
based on IEC 60050(300) or IEC 60050(351), apply.
3.1 variable
quantity or condition whose value is subject to change and can usually be measured (e.g.,
temperature, flow rate, speed, signal, etc.)
[IEV 351-21-01, modified]
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3.2
signal
physical quantity, one or more parameters of which carry information about one or more
variables which the signal represents
[IEV 351-21-51, modified]
3.3
range
range of values defined by the two extreme values, within which a variable can be measured
within the specified accuracy
[IEV 351-27-11, modified]
3.4
span
algebraic difference between the values of the upper and lower limits of the measuring range
[IEV 311-03-13]
3.5
inaccuracy
maximum positive and negative deviation from the specified characteristic curve observed in
testing a device under specified conditions and by a specified procedure
NOTE Accuracy is defined in IEC 60050-300, definition 311-06-08.
3.6
error
algebraic difference between the indicated value and a comparison value of the measured
variable
[IEV 351-27-04, modified]
NOTE The error is positive when the indicated value is greater than the comparison value. The error is generally
expressed as a percentage of the relevant ideal span.
3.7
measured error
largest positive or negative value of errors of the average upscale or downscale values at
each point of measurement
3.8
non-linearity
deviation from linearity
NOTE 1 Linearity is defined in IEC 60050(300), definition 311-06-05.
NOTE 2 Non-linearity does not include hysteresis.
3.9
non-repeatability
deviation from repeatability
NOTE Repeatability is defined in IEC 60050(300), definition 311-06-06.
3.10
hysteresis
property of a device or instrument whereby it gives different output values in relation to its
input values depending on the directional sequence in which the input values have been
applied
[IEV 351-24-15, modified]
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3.11
dead band
finite range of values within which a variation of the input variable does not produce any
measurable change in the output variable
[IEV 351-24-14, modified]
3.12
unexpected event
device breakdown, failure to work, anomaly, or inadvertent damage occurring during an
evaluation, which requires correction by the device manufacturer
3.13
test procedure
statement of the tests to be carried out, and the conditions for each test, agreed between the
manufacturer, the test laboratory, and the purchaser/user before the evaluation starts
3.14
type tests
a test of one or more devices made to a certain design to show that the design meets certain
specifications
NOTE The type tests are in principle applied only on a sample. Normally are not repeated on all the individual
units of equipment made in series.
4 Test categories
The tests specified can be considered under two categories.
a) Complete tests
These cover performance evaluations or type tests to establish the performance of a device
under any likely operating conditions; to permit comparison with the manufacturer's published
or stated performance specification for the device, or the user's requirements.
b) Simplified tests
These cover a selection of the complete tests to check specific characteristics of a device
(e.g., routine tests of all devices before delivery, or tests on a random sample of devices).
Where the full range of tests is not carried out, this shall be stated in all reports on the testing,
and the reasons given (e.g., economy, lack of relevance to the particular application, or failure
of the device). Deviations from the test procedures specified shall also be reported.
The programme of tests, prepared in accordance with this standard, shall be agreed between
the test house, the initiator/purchaser, and where appropriate, the device supplier or
manufacturer, before tests are commenced. Because of the generic nature of this standard,
the tests listed may be too extensive, or insufficiently comprehensive for a particular
requirement, and a modification of the test programme may be agreed.
The criteria for accepting test results (e.g., expected or limiting values), and for judgement of
the quality and acceptance of the device under test, are strictly related to the subsequent use
of the test results, and are outside the scope of this standard.
5 General criteria
5.1 Realistic operating conditions
Ideally, instruments should be evaluated under each of the conditions which they are likely to
meet in service. Unfortunately, it is not practical to evaluate performance under all possible
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combinations of operating conditions. A standard test procedure is therefore specified which
is practical under laboratory conditions, which will provide sufficient data on which a
prediction of field performance can be made. Use of a small number of standard conditions
covering the range will simplify testing, and enable tests on different devices to be more
readily compared.
5.2 Economic aspects
The test procedures, and the number of test points and measurement cycles, shall be chosen
so as to obtain the best compromise between objectives and relevance of the results on the
one hand, and costs and technical difficulties of the test on the other. Standard procedures
should be used, but if tests are omitted or curtailed for economic or other reasons, this shall
be stated in the test report.
5.3 Replication of the tests and comparability of the results
To obtain comparable results from tests performed at different times and places, by
different operators, on different devices of the same type, the test procedures and methods
need to be well defined and reproducible. In particular, the following are required.
5.3.1 Standardization of test methods
The test methods to be followed during the evaluation shall be decided before the start, and
shall conform with standardized test methods wherever possible. Deviation from standard
methods shall be reported.
5.3.2 Influence factors
During the test, all the factors which might influence the behaviour of the Device Under Test
(DUT) shall be checked and maintained as constant as possible (with the exception of the
specific condition being tested).
5.3.3 Documentation of the test methods
The test report shall clearly indicate the standards or standard referred to during the
evaluation, and state the test conditions and any deviation from the specified conditions which
has occurred during the evaluation (a format for a full report of an evaluation is presented in
IEC 61298-4).
5.4 Processing the results
Due to economic aspects (see 5.2), the number of measurements during a test is often
reduced to the minimum, and therefore it is statistically insignificant. Processing of the results
to obtain meaningful information from the evaluation, therefore, cannot be performed following
statistical methods, but it shall be performed following conventional methods.
Consequently, in view of the general nature of the parameters characterizing the DUT (e.g.,
inaccuracy, hysteresis, non-repeatability, dead band, etc.) the calculations are based on
maximum values (positive and negative) of the difference between the measured value and
conventional true values, with the exception of a few quantities, for which use is made of
averaged values (e.g., measured error, non-linearity).
5.5 Independen
...