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
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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
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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
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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
