SIST EN 61285:2007
(Main)Industrial-process control - Safety of analyser houses
Industrial-process control - Safety of analyser houses
This International Standard describes the physical requirements for the safe operation of the process analyser measuring system installed in an AH in order to ensure its protection against fire, explosion and health hazards. This standard extends beyond IEC 60079-16 to include houses with Zone 2 interiors and to apply to toxic hazards. (Appropriate national guidelines on toxic hazards are to be followed.) This standard does not address facilities where dust is the hazard. Clause 4 addresses the location of the AH and connection within the process plant areas. Clause 5 addresses the design, construction and layout of the AH. It does not address parts of the analyser measuring system installed in other locations such as sample conditioning rooms (SCR) or switchgear rooms. Clause 6 addresses measures for reducing the danger of explosion for AHs while permitting maintenance of equipment with the power on and the case open. Using n-Pentane as an example, the LEL is 1,4 % or 14 000 × 10-6. The level immediately dangerous to life or health (which is the maximum level from which a worker could escape within 30 min without any escape-impairing symptoms or any irreversible health effects) is only 0,5 % or 5 000 × 10-6. Classification of a house interior as Zone 1 may imply that no technician can enter without protective equipment such as breathing gear. Placing an AH in a Zone 1 area would usually imply that no technician could approach the house without wearing protective equipment. Clause 7 addresses those measures for protecting personnel from materials in the atmosphere of AHs that are hazardous to health.
Prozessautomatisierung - Sicherheit von Analysengeräteräumen
Commande des processus industriels - Sécurité des bâtiments pour analyseurs
describes the physical requirements for the safe operation of the process analyser measuring system installed in an AH in order to ensure its protection against fire, explosion and health hazards. This standard extends beyond EN 60079-16 to include houses with Zone 2 interiors and to apply to toxic hazards. (Appropriate national guidelines on toxic hazards are to be followed.)
Regulacija industrijskih procesov - Varnost prostorov za analiziranje (IEC 61285:2004)
General Information
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EUROPEAN STANDARD EN 61285
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2004
ICS 25.040.40; 13.110 Supersedes EN 61285:1994
English version
Industrial-process control -
Safety of analyser houses
(IEC 61285:2004)
Commande des processus industriels - Prozessautomatisierung -
Sécurité des bâtiments pour analyseurs Sicherheit von Analysengeräteräumen
(CEI 61285:2004) (IEC 61285:2004)
This European Standard was approved by CENELEC on 2004-11-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and 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
© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61285:2004 E
Foreword
The text of document 65D/107/FDIS, future edition 2 of IEC 61285, prepared by SC 65D, Analyzing
equipment, of IEC TC 65, Industrial-process measurement and control, was submitted to the IEC-
CENELEC parallel vote and was approved by CENELEC as EN 61285 on 2004-11-01.
This European Standard replaces EN 61285:1994.
This new edition includes minor updates to several sections and references.
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) 2005-08-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2007-11-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61285:2004 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 60079-10 NOTE Harmonized as EN 60079-10:2003 (not modified).
IEC 61115 NOTE Harmonized as EN 61115:1993 (not modified).
__________
- 3 - EN 61285:2004
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60079-16 1990 Electrical apparatus for explosive gas - -
atmospheres
Part 16: Artificial ventilation for the
protection of analyser(s) houses
INTERNATIONAL IEC
STANDARD 61285
Second edition
2004-10
Industrial-process control –
Safety of analyser houses
IEC 2004 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.
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International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
– 2 – 61285 © IEC:2004(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.7
2 Normative references .7
3 Terms and definitions .7
4 Location of AHs and connection within the process plant areas .9
4.1 Response time .9
4.2 Utilities.9
4.3 Safety .9
4.4 Access .10
5 Design, construction and layout of AHs .10
5.1 General .10
5.2 General requirements .10
5.3 Dimensions and layout .11
5.4 Structural requirements .11
5.5 Equipment.11
5.6 Labelling/instructions/documentation .13
6 Explosion protection of AHs.14
6.1 General .14
6.2 General requirements.14
6.3 Protection of AHs against explosion hazards by means of artificial ventilation .14
6.4 Protection of AHs against explosion hazards by means of natural ventilation .17
7 Measures to prevent health hazards to personnel in AHs.18
7.1 General .18
7.2 Guidelines .18
7.3 General requirements.18
7.4 Safety measures .19
7.5 External hazards .20
7.6 Additional measures for abnormal working conditions.20
7.7 Labelling/instructions/documentation .20
Annex A (normative) Leakage risk of modules in AHs .22
Annex B (informative) Ventilation calculation (assumes STP conditions).24
Bibliography.27
Table A.1 – Module evaluation.23
61285 © IEC:2004(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL-PROCESS CONTROL –
SAFETY OF ANALYSER HOUSES
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 61285 has been prepared by subcommittee 65D: Analysing
equipment, of IEC technical committee 65: Industrial-process measurement and control.
This second edition cancels and replaces the first edition published in 1994. This edition
constitutes a technical revision.
The main changes with respect to the previous edition are listed below:
a) incorporation of previously issued corrigendum;
b) minor updates to several sections and references
The text of this standard is based on the following documents:
FDIS Report on voting
65D/107/FDIS 65D/110/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 – 61285 © IEC:2004(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.
61285 © IEC:2004(E) – 5 –
INTRODUCTION
Process analysers measure the characteristics of a process stream continuously and
automatically. The process sample is introduced automatically and the system is designed for
unattended operation and minimal maintenance.
This document is designed to set forth minimum safety requirements for typical analyser
houses (AHs). It shall be superseded in all cases by national, local, or corporate
requirements, which may be more stringent.
The measured output is transmitted continuously for process control, operator action or
documentation. Process analysers are used for
– environmental analysis;
– personnel protection;
– equipment protection;
– quality measurement/control;
– process control (plant optimization);
– energy conservation.
In the simplest case, the analyser sensor is mounted directly in the material to be measured,
and there is no need to extract a sample. In other cases, a sample is extracted from the main
stream and transported to the analyser. The system may include many functiona
...
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