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    IEC 60079-28-2015 Explosive atmospheres - Part 28 Protection of equipment and transmission systems using optical radiation《爆炸性气体环境.第28部分 采用光辐射的设备和传输系统的保护》.pdf

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    IEC 60079-28-2015 Explosive atmospheres - Part 28 Protection of equipment and transmission systems using optical radiation《爆炸性气体环境.第28部分 采用光辐射的设备和传输系统的保护》.pdf

    1、 IEC 60079-28 Edition 2.0 2015-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 28: Protection of equipment and transmission systems using optical radiation Atmosphres explosives Partie 28: Protection du matriel et des systmes de transmission utilisant le rayonnement optique

    2、 IEC 60079-28:2015-05(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photo

    3、copying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your loc

    4、al IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfil

    5、ms, sans laccord crit de lIEC ou du Comit national de lIEC du pays du demandeur. Si vous avez des questions sur le copyright de lIEC ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de lIEC de votre pays de rsid

    6、ence. IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varemb Fax: +41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all

    7、electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. IEC Catalogue - webstore.iec.ch/catal

    8、ogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards, Technical Specifications, Technical Reports and other documents. Available for PC, Mac OS, Android Tablets and iPad. IEC publications search - www.iec.ch/searchpub The advanced sear

    9、ch enables to find IEC publications by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published deta

    10、ils all new publications released. Available online and also once a month by email. Electropedia - www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French, with equivalent terms in 15 additio

    11、nal languages. Also known as the International Electrotechnical Vocabulary (IEV) online. IEC Glossary - std.iec.ch/glossary More than 60 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002. Some entries

    12、have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR. IEC Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. A propos de lIEC La Commission E

    13、lectrotechnique Internationale (IEC) est la premire organisation mondiale qui labore et publie des Normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications IEC Le contenu technique des publications IEC est constamment revu. Ve

    14、uillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Catalogue IEC - webstore.iec.ch/catalogue Application autonome pour consulter tous les renseignements bibliographiques sur les Normes internationales, Spcifications techniques, Rapports tech

    15、niques et autres documents de lIEC. Disponible pour PC, Mac OS, tablettes Android et iPad. Recherche de publications IEC - www.iec.ch/searchpub La recherche avance permet de trouver des publications IEC en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Elle donne aussi des inf

    16、ormations sur les projets et les publications remplaces ou retires. IEC Just Published - webstore.iec.ch/justpublished Restez inform sur les nouvelles publications IEC. Just Published dtaille les nouvelles publications parues. Disponible en ligne et aussi une fois par mois par email. Electropedia -

    17、www.electropedia.org Le premier dictionnaire en ligne de termes lectroniques et lectriques. Il contient plus de 30 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans 15 langues additionnelles. Egalement appel Vocabulaire Electrotechnique International (IEV) en li

    18、gne. Glossaire IEC - std.iec.ch/glossary Plus de 60 000 entres terminologiques lectrotechniques, en anglais et en franais, extraites des articles Termes et Dfinitions des publications IEC parues depuis 2002. Plus certaines entres antrieures extraites des publications des CE 37, 77, 86 et CISPR de lI

    19、EC. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60079-28 Edition 2.0 2015-05 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 28: Protection of equipment and

    20、 transmission systems using optical radiation Atmosphres explosives Partie 28: Protection du matriel et des systmes de transmission utilisant le rayonnement optique INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.260.20 ISBN 978-2-8322-2679-7 Registered tr

    21、ademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr

    22、. colour inside 2 IEC 60079-28:2015 IEC 2015 CONTENTS FOREWORD . 4 INTRODUCTION . 8 1 Scope 9 2 Normative references 10 3 Terms and definitions 10 4 General requirements 13 5 Types of protection 13 5.1 General . 13 5.2 Requirements for inherently safe optical radiation “op is” 14 5.2.1 General . 14

    23、5.2.2 Continuous wave radiation . 14 5.2.3 Pulsed radiation . 18 5.2.4 Ignition tests 19 5.2.5 Over-power/energy fault protection 19 5.3 Requirements for protected optical radiation “op pr” 20 5.3.1 General . 20 5.3.2 Radiation inside optical fibre or cable 20 5.3.3 Radiation inside enclosures . 21

    24、5.4 Optical system with interlock “op sh” . 21 6 Type verifications and tests . 22 6.1 Test set-up for ignition tests 22 6.1.1 General . 22 6.1.2 Test vessel 22 6.1.3 Criteria to determine ignition 23 6.2 Verification of suitability of test set-up for type tests . 23 6.2.1 Reference gas . 23 6.2.2 R

    25、eference absorber . 23 6.2.3 Reference test for continuous wave radiation and pulses above 1 s duration . 23 6.2.4 Reference test for pulsed radiation below 1 ms pulse duration . 23 6.3 Type tests . 24 6.3.1 Ignition tests with continuous wave radiation and pulses above 1 s duration . 24 6.3.2 Ignit

    26、ion tests with single pulses less than 1 ms duration 24 6.3.3 Tests for pulse trains and pulses from 1 ms to 1 s duration 24 6.3.4 Absorber targets for type tests . 24 6.3.5 Test acceptance criteria and safety factors 25 7 Marking . 25 Annex A (informative) Reference test data . 27 Annex B (informat

    27、ive) Ignition mechanisms 28 Annex C (normative) Ignition hazard assessment . 33 Annex D (informative) Typical optical fibre cable design 35 Annex E (normative) Flow diagram for the assessment of pulses . 36 Bibliography 37 IEC 60079-28:2015 IEC 2015 3 Figure 1 Optical ignition delay times and safe b

    28、oundary curve with safety factor of 2 22 Figure B.1 Minimum radiant igniting power with inert absorber target ( 1064 nm =83 %, 805 nm =93 %) and continuous wave-radiation of 1064 nm . 31 Figure B.2 Minimum radiant igniting power with inert absorber target ( 1 064nm=83 %, 805nm=93 %) and continuous w

    29、ave-radiation (PTB: 1064 nm, HSL: 805 nm, 8: 803 nm) for some n-alkanes . 32 Figure C.1 Ignition hazard assessment 33 Figure D.1 Example Multi-Fibre Optical Cable Design For Heavy Duty Applications . 35 Figure D.2 Typical Single Optical Fibre Cable Design 35 Figure E.1 Flow diagram for the assessmen

    30、t of pulses according to 5.2.3 36 Table 1 EPLs achieved by application of types of protection for optical systems 13 Table 2 Safe optical power and irradiance for Group I and II equipment, categorized by Equipment Group and temperature class 15 Table 3 Safe optical power and irradiance for Group III

    31、 equipment . 15 Table 4 Safe limit values for intermediate area, Group I or II, constant power, T1 T4 atmospheres, equipment Groups IIA, IIB or IIC (Data derived from Figure B.1 including a safety factor) . 16 Table A.1 Reference values for ignition tests with a mixture of propane in air at 40 C mix

    32、ture temperature 27 Table B.1 AIT (auto ignition temperature), MESG (maximum experimental safe gap) and measured ignition powers of the chosen combustibles for inert absorbers as the target material ( 1 064 nm =83 %, 805 nm =93) 30 Table B.2 Comparison of measured minimum igniting optical pulse ener

    33、gy (Q e,p i,min ) at 90 m beam diameter with auto ignition temperatures (AIT) and minimum ignition energies (MIE) from literature 9 at concentrations in percent by volume ( ) 32 4 IEC 60079-28:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 28: Protection of equi

    34、pment and transmission systems using optical radiation 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-opera

    35、tion 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

    36、“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 prep

    37、aration. 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 cons

    38、ensus 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

    39、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

    40、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 itself does not provide any attestation of conformity. Independ

    41、ent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liab

    42、ility 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 (incl

    43、uding 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

    44、 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 60079-28 has been prepared by IEC technical c

    45、ommittee 31: Equipment for explosive atmospheres. This second edition cancels and replaces the first edition, published in 2006, and constitutes a technical revision. The significance of the changes between IEC 60079-28, Edition 2.0 (2015) and IEC 60079-28, Edition 1.0 (2006), is as listed below: IE

    46、C 60079-28:2015 IEC 2015 5 Significance of changes with respect to IEC 60079-28:2006 Type Significant Changes Clause Minor and editorial changes Extension Major technical changes Scope: Expansion to include Group III and EPLs Da, Db and Dc 1 x Scope: Clarification and list of exclusions for optical

    47、radiation sources 1 x Normative references: Deletion of IEC 60079-10, and addition of IEC 60050-426 and 60050-731 2 x Terms and definitions: Some definitions not used in the standard deleted. New definitions added. 3 x General requirements: Introduction of an ignition hazard assessment moved to 4, s

    48、tatement for presence of absorbers added, Explanation of EPLs deleted 4 x Table 1: EPLs versus protection types moved from 5.5 to 5.1, table modified and extended 5.1 x x Structure of Table 2 changed and extended explanation in the notes, but with the same limit values 5.2.2.1 x Table 3 for Group II

    49、I added 5.2.2.1 x Table 4 replaces Figure 1 for better application 5.2.2.1 x Detailed requirements for the measurement of optical power added 5.2.2.2 x Detailed requirements for the measurement of optical irradiance added 5.2.2.3 x Requirements for the assessment of optical pulses for Group II much more detailed 5.2.3.1 5.2.3.2 5.2.3.3 5.2.3.4 x Requirements for the assessment of optical pulses for Group I


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