SIST EN 61987-1:2007
(Main)Industrial-process measurement and control - Data structures and elements in process equipment catalogues -- Part 1: Measuring equipment with analogue and digital output
Industrial-process measurement and control - Data structures and elements in process equipment catalogues -- Part 1: Measuring equipment with analogue and digital output
defines a generic structure in which product features of industrial- process measurement and control equipment with analogue or digital output should be arranged, in order to facilitate the understanding of product descriptions when they are transferred from one party to another. It applies to the production of catalogues of process measuring equipment supplied by the manufacturer of the product and helps the user to formulate his requirements.
Industrielle Leittechnik - Datenstrukturen und -elemente in Katalogen der Prozessleittechnik - Teil 1: Messeinrichtungen mit analogen und digitalen Ausgängen
Mesure et commande dans les processus industriels - Structures et éléments de données dans les catalogues d'équipement de processus -- Partie 1: Equipement de mesure à sortie analogique et numérique
La CEI 61987-1:2006 définit une structure générique dans laquelle il convient d'agencer les caractéristiques des équipements de mesure et de commande dans les processus industriels avec sortie analogique ou numérique, afin de faciliter la compréhension des descriptions de produit quand elles sont transférées d'une partie à l'autre. Elle s'applique à la production des catalogues d'équipements de mesure de processus fournis par le fabricant du produit et aide l'utilisateur à formuler ses exigences.
Merjenje in nadzor v industrijskih procesih – Strukture podatkov in elementov v katalogih procesne opreme – 1. del: Merilna oprema z analognim in digitalnim izhodom (IEC 61987-1:2006)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2007
Merjenje in nadzor v industrijskih procesih – Strukture podatkov in elementov v
katalogih procesne opreme – 1. del: Merilna oprema z analognim in digitalnim
izhodom (IEC 61987-1:2006)
Industrial-process measurement and control - Data structures and elements in process
equipment catalogues -- Part 1: Measuring equipment with analogue and digital output
Industrielle Leittechnik - Datenstrukturen und -elemente in Katalogen der
Prozessleittechnik - Teil 1: Messeinrichtungen mit analogen und digitalen Ausgängen
Mesure et commande dans les processus industriels - Structures et éléments de
données dans les catalogues d'équipement de processus -- Partie 1: Equipement de
mesure a sortie analogique et numérique
Ta slovenski standard je istoveten z: EN 61987-1:2007
ICS:
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
35.240.50 Uporabniške rešitve IT v IT applications in industry
industriji
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 61987-1
NORME EUROPÉENNE
February 2007
EUROPÄISCHE NORM
ICS 25.040.40;35.240.50
English version
Industrial-process measurement and control -
Data structures and elements in process equipment catalogues -
Part 1: Measuring equipment with analogue and digital output
(IEC 61987-1:2006)
Mesure et commande Industrielle Leittechnik -
dans les processus industriels - Datenstrukturen und -elemente
Structures et éléments de données in Katalogen der Prozessleittechnik -
dans les catalogues d'équipement Teil 1: Messeinrichtungen mit analogen
de processus - und digitalen Ausgängen
Partie 1: Equipement de mesure (IEC 61987-1:2006)
à sortie analogique et numérique
(CEI 61987-1:2006)
This European Standard was approved by CENELEC on 2007-02-01. 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
© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61987-1:2007 E
Foreword
The text of document 65B/599/FDIS, future edition 1 of IEC 61987-1, prepared by SC 65B, Devices &
process analysis, of IEC TC 65, Industrial-process measurement and control, was submitted to the
IEC-CENELEC parallel vote and was approved by CENELEC as EN 61987-1 on 2007-02-01.
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) 2007-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-02-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61987-1:2006 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068 NOTE Harmonized in EN 60068 series (not modified).
IEC 60751 NOTE Harmonized as EN 60751:1995 (not modified).
IEC 60770-2 NOTE Harmonized as EN 60770-2:2003 (not modified).
IEC 61082 NOTE Harmonized in EN 61082 series (not modified).
IEC 61326 NOTE Harmonized in EN 61326 series (not modified).
IEC 61360 NOTE Harmonized in EN 61360 series (not modified).
IEC 82045-1 NOTE Harmonized as EN 82045-1:2001 (not modified).
ISO 8879 NOTE Harmonized as EN 28879:1990 (not modified).
ISO 10303-21 NOTE Harmonized as ENV ISO 10303-21:1995 (not modified).
__________
- 3 - EN 61987-1:2007
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
IEC 60529 1989 Degrees of protection provided by enclosures EN 60529 1991
(IP Code) + corr. May 1993
A1 1999 A1 2000
IEC 60559 1989 Binary floating-point arithmetic for HD 592 S1 1991
microprocessor systems
IEC 60654-1 1993 Industrial-process measurement and control EN 60654-1 1993
equipment - Operating conditions -
Part 1: Climatic conditions
IEC 60770-1 1999 Transmitters for use in industrial-process EN 60770-1 1999
control systems -
Part 1: Methods for performance evaluation
IEC 61000-4 Series Electromagnetic compatibility (EMC) EN 61000-4 Series
IEC 61069 Series Industrial-process measurement and control - EN 61069 Series
Evaluation of system properties for the
purpose of system assessment
IEC 61298 Series Process measurement and control devices - EN 61298 Series
General methods and procedures for
evaluating performance
ISO 3511-1 1977 Process measurement control functions and - -
instrumentation - Symbolic representation -
Part 1: Basic requirements
INTERNATIONAL IEC
STANDARD 61987-1
First edition
2006-12
Industrial-process measurement and control –
Data structures and elements in process
equipment catalogues –
Part 1:
Measuring equipment with analogue
and digital output
© IEC 2006 ⎯ 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: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale X
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
– 2 – 61987-1 © IEC:2006(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.7
2 Normative references.7
3 Terms and definitions .7
4 Metadocuments .15
4.1 General .15
4.2 Metadocument chapters and features .16
4.3 Nomenclature .18
5 Metadocument for process measuring equipment.18
5.1 Identification.18
5.2 Application.19
5.3 Function and system design.19
5.4 Input.20
5.5 Output .20
5.6 Performance characteristics .21
5.7 Operating conditions.22
5.8 Mechanical construction .24
5.9 Operability.25
5.10 Power supply.25
5.11 Certificates and approvals .26
5.12 Ordering information.26
5.13 Documentation .26
Annex A (normative) Classification of features as a function of measuring equipment .27
Annex B (informative) Classification of features as a function of measurement principle .29
Bibliography .49
Figure 1 – Classification scheme for process measuring equipment.16
Table A.1 – Classification and documentation structure of measuring equipment. .27
Table B.1 – Classification and documentation structure of flow measuring equipment .30
Table B.2 – Classification and documentation structure of level measuring equipment .34
Table B.3 – Classification and documentation structure of pressure measuring
equipment.38
Table B.4 – Classification and documentation structure of temperature measuring
equipment.43
Table B.5 – Classification and documentation structure of temperature measuring
equipment.46
61987-1 © IEC:2006(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL –
DATA STRUCTURES AND ELEMENTS
IN PROCESS EQUIPMENT CATALOGUES –
Part 1: Measuring equipment with analogue and digital output
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 61987-1 has been prepared by subcommittee 65B: Devices, of IEC
technical committee 65: Industrial-process measurement and control.
This standard cancels and replaces IEC/PAS 61987-1 published in 2002. This first edition
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
65B/599/FDIS 65B/602/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.
– 4 – 61987-1 © IEC:2006(E)
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 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.
A bilingual edition of this standard may be issued at a later date.
61987-1 © IEC:2006(E) – 5 –
INTRODUCTION
In recent years, industry has become alert to the fact that a great deal of time and effort is
wasted in the transposition of measuring equipment data from one form to another. The
technical data of an instrument, for example, may exist at the manufacturer’s facilty as two
separate data sets for paper and electronic presentation: the end-user requires much the same
data for works standards, engineering data bases or commercial data bases. In most cases,
however, the data cannot be automatically re-used because each application has its own
particular data storage format.
A second problem that belies the re-use of technical data is the content of the product
descriptions themselves. There is little agreement between manufacturers on what information
a technical data sheet should contain, how it should be arranged or how the results, for
example, of particular performance tests should be presented. When transferring this
information into a data base, an end-user will always find gaps and proprietary interpretations
that make the task more difficult.
This standard aims at solving these problems by defining a generic structure and its content for
industrial-process measuring and control equipment. It builds upon the assumption that, for a
given class of measuring equipment, for example, pressure measuring equipment, temperature
measuring equipment or electromagnetic flow-measuring equipment, a set of non-proprietary
structures and product features can be specified. The resulting documents cannot only be
exchanged electronically, they can also be presented to humans in an easily understandable
form.
This standard is applicable to electronic catalogues of process measuring equipment with
analogue and digital output. Further parts with similar classification structures will be produced
for measuring equipment with binary output and interface equipment in the future. (The
structure already contains a great many product features that are common to measuring
equipment with binary output.) Similarly, Annex B has been prepared with a view to future
standardization.
This standard is not intended as a replacement for existing standards, but rather as a guiding
document for all future standards which are concerned with the specifications of process
measuring equipment. Every revision of an existing standard should take into account the
structures and product features defined in Clause 5 of this standard or work towards a
harmonization.
Annex A contains a tabular overview of the classification and catalogue structure of process
measuring equipment. Annex B contains tables with a further sub-classification for specific
measured variables.
Wherever possible, existing terms from international standards have been used to name the
product features within the structures. In accordance with ISO 10241, Clause 3 of this standard
contains a list of terms, definitions and sources.
Documents created according to the standard are structured. A possible means of exchanging
structured information free of layout information is given by Standard Generalized Mark-Up
Language (SGML) described in ISO 8879 or Extensible Mark-Up Language (XML), which is
derived from it.
This standard could also provide the basis for arranging properties (data element types) that
conform to IEC 61360 or ISO 13584. This would require that the features which, in this
standard, can be textual units, graphical and tabular representations, etc., be broken down into
properties (data element types) conforming to the said standards. For example, a range would
be expressed as a lower range-limit (LRL) and upper range-limit (URL) with unit of measure;
dimensions (L × B × H) as three separate elements, length, breadth and height with unit of
measure; or a derating curve as an appropriate series of data element pairs.
– 6 – 61987-1 © IEC:2006(E)
This standard conforms to ISO 15926-1 and ISO 15926-2 with respect to the data model and
associated reference data library (ISO 15926-4), for example, as used for the limited
classification structure. At the same time, it is also aligned to the Standard for the Exchange of
Product Model Data (STEP). The data model and definitions of ISO 10303-21 uses the ISO
15926-4 TS reference data library as “library”. The current standard can reproduce the data
fields according to this standard, including, for example, product structure data, dimensional
data, electrical connection data and product properties such as measuring range or power
supply.
61987-1 © IEC:2006(E) – 7 –
INDUSTRIAL-PROCESS MEASUREMENT AND CONTROL –
DATA STRUCTURES AND ELEMENTS
IN PROCESS EQUIPMENT CATALOGUES –
Part 1: Measuring equipment with analogue and digital output
1 Scope
This part of IEC 61987 defines a generic structure in which product features of industrial-
process measurement and control equipment with analogue or digital output should be
arranged, in order to facilitate the understanding of product descriptions when they are
transferred from one party to another. It applies to the production of catalogues of process
measuring equipment supplied by the manufacturer of the product and helps the user to
formulate his requirements.
This standard also serves as a reference document for all future standards which are
concerned with process measuring equipment catalogues. In addition, it is intended as a guide
for the production of further standards on process equipment documentation for similar
systems, for example, for other measuring equipment and actuators.
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 60529:2001, Degrees of protection provided by enclosures (IP Code)
IEC 60559:1989, Binary floating-point arithmetic for microprocessor systems
IEC 60654-1:1993, Industrial-process measurement and control equipment – Operating
conditions – Part 1: Climatic conditions
IEC 60770-1:1999, Transmitters for use in industrial-process control systems – Part 1: Methods
for performance evaluation
IEC 61000-4 (all parts), Electromagnetic compatibility (EMC) – Part 4: Testing and
measurement techniques
IEC 61069 (all parts), Industrial-process measurement and control – Evaluation of system
properties for the purpose of system assessment
IEC 61298 (all parts), Process measurement and control devices – General methods and
procedures for evaluating performance
ISO 3511-1:1977, Process measurement control functions and instrumentation – Symbolic
representation – Part 1: Basic requirements
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
– 8 – 61987-1 © IEC:2006(E)
3.1
ambient conditions
environmental conditions
characteristics of the environment which may affect performance of the device or system
NOTE Examples of ambient conditions are pressure, temperature, humidity, vibration, radiation.
[IEV 151-16-03]
3.2
ambient temperature
temperature measured at a representative point within the local environment, including
adjacent heat generating equipment, in which the measurement and control equipment will
normally operate, be stored or transported (see 3.1)
3.3
ambient temperature limits
extreme values of ambient temperature to which a device may be subjected without permanent
impairment of operating characteristics (see 3.18 and 3.19)
NOTE The performance characteristics may be exceeded in the range between the limits of normal operation and
the operating temperature limits.
3.4
ambient temperature range
range of ambient temperatures within which a device is designed to operate within specified
accuracy limits (see 3.29 and 3.31)
3.5
analogue signal
signal whose information parameter may assume any value within a given continuous range
[IEV 351-12-18]
3.6
binary signal
digital signal whose information parameter may assume one out of two discrete values
[IEV 351-12-20]
3.7
climate class
climatic conditions, i.e. ambient temperature, pressure and humidity, to which the
measurement equipment can be subjected during operation (including shutdown), transport
and storage (over land or sea)
[IEC 60654-1, Clause 4]
3.7.1
class A: air-conditioned location
location in which both air temperature and humidity are controlled within specific limits
3.7.2
class B: heated and/or cooled enclosed location
location where only air temperature is controlled within specific limits
3.7.3
class C: sheltered location
location where neither air temperature nor humidity are controlled. The equipment is protected
against direct exposure to sunlight, rain or other precipitation and full wind pressure
61987-1 © IEC:2006(E) – 9 –
3.7.4
class D: outdoor location
location where neither air temperature nor humidity are controlled. The equipment is exposed
to outdoor atmospheric condition such as direct sunlight, rain, hail, sleet, snow, icing, wind and
blown sand
3.8
degree of protection
extent of protection provided by an enclosure against access to hazardous parts, against
ingress of solid foreign objects and/or ingress of water and verified by standardized test
methods
[IEC 60529, 3.3]
3.9
dependability
extent to which a system can be relied upon to perform exclusively and correctly a task under
given conditions at a given instant of time or over a given time interval, assuming that the
required external sources are provided
[IEC 61069-5, 3.1]
3.10
digital signal
signal, the information parameter of which may assume one out of a set of discrete values
[IEV 351-12-19]
3.11
drift
change in the indication of a measuring system, generally slow, continuous, not necessarily in
the same direction and not related to a change in the quantity being measured
[IEV 311-06-13, modified]
3.12
electromagnetic compatibility
ability of measuring equipment or a measuring system to function satisfactorily in its
electromagnetic environment without introducing intolerable electromagnetic disturbances to
anything in that environment
[IEV 161-01-07, modified]
3.13
environmental influence
change in the output of an instrument caused solely by the departure of one of the specified
environmental conditions from its reference value, all other conditions being held constant (see
3.16 and 3.52)
3.14
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
[IEC 61298-2, 3.13]
– 10 – 61987-1 © IEC:2006(E)
3.15
influence of ambient temperature
change in zero (lower range-value) and/or span caused by a change in ambient temperature
from the reference temperature up to the limits of the ambient temperature range quoted in the
performance specifications (see 3.16)
3.16
influence quantity
quantity that is not the subject of the measurement and whose change affects the relationship
between the indication and the result of the measurement [≈ VIM 2.7]
NOTE 1 This term is used in the “uncertainty” approach.
NOTE 2 Influence quantities can originate from the measured system, the measuring equipment or the
environment.
NOTE 3 As the calibration diagram depends on the influence quantities, in order to assign the result of a
measurement it is necessary to know whether the relevant influence quantities lie within the specified range.
[IEV 311-06-01]
3.17
integrity
assurance provided by a system that the tasks will be performed correctly unless notice is
given of any state of the system, which could lead to the contrary
[IEC 61069-5, 3.5]
3.18
limiting condition
extreme condition that a measuring system is required to withstand without damage and
without degradation of specified metrological characteristics when it is subsequently operated
under its rated operating conditions.
NOTE 1 Limiting conditions for storage, transport or operation can differ.
NOTE 2 Limiting conditions can include limiting values of the quantity being measured and of any influence
quantity.
[VIM 5.6]
3.19
limiting values for operation
extreme values which an influence quantity can assume during operation without damaging the
measuring instrument so that it no longer meets its performance requirements when it is
subsequently operated under reference conditions
NOTE The limiting values can depend on the duration of their application.
[IEV 311-07-06]
3.20
limiting values for storage
extreme values which an influence quantity can assume during storage without damaging the
measuring instrument so that it no longer meets its performance requirements when it is
subsequently operated under reference conditions
NOTE The limiting values can depend on the duration of their application.
[IEV 311-07-07]
3.21
limiting values for transport
extreme values which an influence quantity can assume during transport without damaging the
measuring instrument so that it no longer meets its performance requirements when it is
subsequently operated under reference conditions
61987-1 © IEC:2006(E) – 11 –
NOTE The limiting values can depend on the duration of their application.
[IEV 311-07-08]
3.22
long-term drift
drift in output monitored for 30 days at 90 % of span
[IEC 61298-2, 7.2]
3.23
maintainability
ability of an item under given conditions of use, to be retained in, or restored to, a state in
which it can perform a required function, when maintenance is performed under given
conditions and and using stated procedures and resources
[IEC 61069-5, 3.3]
3.24
maximum measured error
largest positive or negative value of error of the upscale or downscale value at each point of
measurement
[IEC 60770-2, 3.7]
3.25
measurand
particular quantity subject to measurement [VIM 2.6]
[IEV 311-01-03]
3.26
measuring range
range of values defined by the two extreme values within which a variable can be measured
within the specified accuracy
NOTE The extreme values are usually termed the upper range-limit and the lower range-limit.
[IEV 351-12-35]
3.27
measurement principle, measuring principle
phenomenon serving as the basis of a measurement.
NOTE The measurement principle can be a physical, chemical, or biological phenomenon.
[VIM 2.3]
3.28
non-repeatability (repeatability error)
algebraic difference between the extreme values obtained by a number of consecutive
measurements of the output over a short period of time for the same value of the input under
the same operating conditions, approaching from the same direction, for full range traverses.
NOTE It is usually expressed in percentage of span and does not include hysteresis and drift.
[IEC 61298-2, 3.12, modified]
3.29
nominal range of use
specified range of values which an influence quantity can assume without causing a variation
exceeding specified limits
– 12 – 61987-1 © IEC:2006(E)
[IEV 311-07-05]
3.30
normal operating conditions
range of operating conditions within which a device is designed to operate within specified
performance limits (see 3.31)
3.31
operating conditions
conditions to which a device is subjected, not including the variables handled by the device
NOTE Examples of operating conditions include ambient pressure, ambient temperature, electromagnetic fields,
gravitational force, inclination, power supply variation (voltage, frequency, harmonics), radiation, shock, and
vibration. Both static and dynamic variations in these conditions should be considered (see IEC 60654).
[IEV 351-18-33, modified] (see also [IEV 151-16-01])
3.32
operating limits
range of operating conditions to which a device may be subject without permanent impairment
of operating characteristics (see 3.18)
NOTE 1 In general, performance characteristics are not stated for the region between the limits of normal
operation conditions and the operating limits.
NOTE 2 Upon returning within the limits of normal operating conditions, a device may require adjustments that
restore normal performance.
NOTE 3 The limiting conditions for storage, transport and operation may be different.
3.33
output variable
recordable variable of a system, influenced only by the system and its input variables
[IEV 351-12-04]
3.34
performance
characteristics defining the ability of a measuring instrument to achieve the intended functions
[IEV 311-06-11]
3.35
power source
primary source, usually a.c. mains, from which the system's energy is derived
3.36
power supply device
separate unit which can convert, rectify, regulate or otherwise modify the form of energy from
the power source to provide suitable energy for a system or elements of a system for
measurement and control
3.37
rangeability
ratio of the maximum span to the minimum span to which an instrument can be adjusted within
the specified accuracy rating.
Example: If the span of a device is adjustable from 10 to 90, its rangeability is 90/10 = 9
3.38
rated operating condition
condition to be fulfilled during measurement in order that a measuring system performs as
designed
61987-1 © IEC:2006(E) – 13 –
NOTE The rated operating condition generally specifies intervals of values for the quantity being measured and for
any influence quantity.
[VIM 5.5]
3.39
reference conditions
condition of use prescribed for evaluating the performance of a measuring system or for
comparison of measurement results
NOTE Reference conditions generally specify intervals of values for any influence quantity.
[VIM 5.7]
3.40
reliability
ability of an item to perform a required function under given conditions for a given time interval
[IEC 61069-5, 3.2]
3.41
response time (thermal)
time a thermometer takes to respond at a specified percentage to a step change in
temperature
NOTE To specify response time it is necessary to declare
a) the percentage of response (usually 50 % or 90 %);
b) the test medium and the flow conditions (usually water with 0,4 m/s and air with 3 m/s).
[IEC 60751, 4.3.3]
3.42
rise time
for a step response, time interval between the instant when the output signal reaches a small
specified percentage of the difference between the final and the initial steady- state vales and
the instant when it reaches for the first time a large specified percentage of the same steady-
state difference
NOTE Conventional values are 5 % to 95 % or 10 % to 90 %.
[IEC 61298-2, 3.17, modified]
3.43
security
assurance provided by a system that any incorrect input or unauthorized access is denied
[IEC 61069-5, 3.6]
3.44
settling time
duration of the time interval between the instant of a step change in one of the input variables
and the instant when the output variable does not deviate by more than a specified tolerance
(e.g. 5 %) from the difference between its final and initial steady-state values
NOTE 1 Conventional values for tolerance are ±2 % and ±5 %.
NOTE 2 For non-linear behaviour, both magnitude and position of the input variable should be specified.
[IEV 351-14-43]
– 14 – 61987-1 © IEC:2006(E)
3.45
shock
sudden non-periodic motion caused by a blow, impact, collision, concussion or violent shake or
jar
NOTE There are two methods to measure shock:
a) the first is to specify a value of acceleration or deceleration together with its duration;
b) the second is to specify a height of free fall on to a specified flat surface.
3.46
signal
physical quantity, one or more parameters of which carry information about one or more
variables which the signal represents
NOTE These parameters are called "information parameters".
[IEV 351-12-16]
3.47
span
algebraic difference between the values of the upper and lower limits of the measuring range [=
VIM 5.2]
[IEV 311-03-13]
3.48
standardized signal
signal, the lower and upper range-values of which are standardized
Examples: 4 mA d.c. – 20 mA d.c.; 20 kPa – 100 kPa
3.49
start-up drift
drift in output monitored over a period of 4 h after power is switched on
[IEC 61298-2, 7.1]
3.50
storage and transportation conditions
specified conditions to which a device may be subject between the time of construction and the
time of operation (see 3.20 and 3.21)
NOTE During storage and transportation, the device is inoperative and appropriately protected and/or packed to
meet the specified condition limits so that the device will not be damaged or suffer a degradation of performance.
3.51
storage temperature
ambient temperature to which a device may be subject between the time of construction and
the time of operation (see 3.1and 3.18)
3.52
type of protection
specific measures applied to electrical apparatus to avoid ignition of a surrounding explosive
atmosphere by such apparatus
[IEV 426-01-02]
3.53
variation (due to an influence quantity)
difference between the indications of a measuring system for the same value of the quantity
being measured when an influence quantity assumes, successively, two different values
61987-1 © IEC:2006(E) – 15 –
[VIM 4.19]
3.54
vibration
periodic motion, reciprocating, rotary or both, usually with a well-defined fundamental
frequency
NOTE A typical example is the vibration of rotating machinery.
3.55
warm-up time
duration between the instant after which the power supply is energized and the instant when
the measuring instrument may be used, as specified by the manufacturer
[IEV 311-03-18]
3.56
zero adjustment
means provided in an instrument to cause a parallel shift in the input-output curve
[IEC 60770-1, 3.1]
4 Metadocuments
4.1 General
A metadocument is a document that describes how other documents for a particular purpose,
in this case for the exchange of product catalogue data, are to be created and structured.
Metadocuments in this standard describe the non-proprietary structures (chapters) and product
features (textual descriptions, tables, diagrams, photographs, or single properties) of a class of
process measuring equipment. They serve as specimen and procedural instructions for the
production of process equipment catalogues by the equipment manufacturer.
Metadocuments form a document hierarchy corresponding to the hierarchical classification of
the process measuring equipment. A metadocument can exist at each level of the hierarchy
which describes structures and features common to all equipment at this hierarchical level.
Metadocuments at lower hierarchical levels inherit the structure and features from the
metadocuments at levels above them.
Figure 1 shows the classification scheme for process measuring equipment used in this
standard. It is based on the table of letter codes for identification of instrument functions to be
found in ISO 3511-1. Process measuring equipment may be further subdivided into continuous
measuring equipment, the measurement value of which is expressed as a quantitative value
through analogue or digital output, and limit detecting equipment, the measurement value of
which is expressed as a binary-state signal. The metadocument defined in Clause 5 defines the
common structures and features that are to be found at this level in the hierarchy.
Each piece of equipment is designed to measure one or more process variables, for example,
level, pressure, flow, or temperature. To fully define the technical data of say, a flowmeter,
additional features, for example, inlet and outlet run, shall be added to those inherited from the
level above.
The methods used to measure a particular process variable form a further level in the
hierarchy. Thus, flow may be measured by a differential pressure transmitter sensing the
differential pressure produced across a primary element, a variable area flowmeter, an
electromagnetic flowmeter, etc. Depending on the measuring method used, additional features
can again be added to the structure to adequately characterize the equipment. Such additional
– 16 – 61987-1 © IEC:2006(E)
features have already been defined for the measurement methods shaded grey in Figure 1
(see Annex B).
Measurement
equipment
W (Weight,
D (Density) F (Flow) L (Level) P (Pressure, Δp) R (Radiation) T (Temperature)
Mass)
E (Electrical S (Speed, Rotat.,
Q (Quality)
variables) Frequency)
Differential Resistance
Hydrostatic Capacitance
Oscillation
pressure thermometer
Thermocouple
Radiometric Variable area Displacement Inductance
Electromagnetic
Buoyancy Pyrometer
Ultrasonic Strain gauge
Refractive
Ultrasonic Ultrasonics Frequency Expansion
index
etc.
Bimetallic
Vortex Microwave Force
strip
Positive Hot/cold
Laser/optical Displacement
displacement conductor
etc. etc.
Turbine Radiometric
Coriolis Capacitance
Thermal Vibration
Included in overview tables
Annex B
etc. etc.
IEC 2308/06
NOTE Letter codes D, F, L, etc. identifying the measuring equipment function are taken from ISO 3511-1.
Figure 1 – Classification scheme for process measuring equipment
4.2 Metadocument chapters and features
The metadocument shall be structured for all process measuring equipment as follows.
1 Identification
2 Application
3 Function and system design
61987-1 © IEC:2006(E) – 17 –
4 Input
5 Output
6 Performance characteristics
7 Operating conditions
7.1 Installation
7.2 Environment
7.3 Process
8 Mechanical construction
9 Operability
10 Power supply
11 Certificates and approvals
12 Ordering information
13 Documentation
This standard shall be used by the equipment manufacturer, in that he takes the
metadocuments and organizes the technical data for his measuring equipment under the
structure and features defined for each chapter. The document may also contain photographs,
drawings and tables.
NOTE 1 For the preparation of metadocument data, see also IEC 82045; for the preparation of diagrams, tables
and lists, see also IEC 61082.
Features common to all process measuring equipment are compiled in Clause 5 of this
standard. At the start of each subclause, for example 5.1, it is stated what information is
expected to be entered at that point in the metadocument. The information itself is then
entered under the appropriate feature. Where necessary, the vendor/manufacturer is free to
specify additional, non-standard features at each point in the structure.
If no feature is specified for a part of the structure, the vendor/manufacturer is free to present
his information as he likes under the structure heading, for example, by the use of non-
standard features.
NOTE 2 The nomenclature adopted in the metadocument defined in Clause 5 is based on terms and concepts
drawn from international standards.
NOTE 3 Clause 5 also includes so-called synonymous names. A synoymous name is a related designation or
concept. It is intended for electronic searches only and should not be substituted for the preferred term.
NOTE 4 Each term in Clause 5 is accompanied by an explanation of what is to be entered in the data element.
These explanations are informative only and do not constitute normative definitions.
The metadocument of the measuring equipment for particular measured variables is
summarized in Table A.1.
Annex B contains tables for the measurement methods which have so far been considered.
The tables indicate general specifications to be made in
...
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