1、BSI Standards Publication BS ISO 9022-20:2015 Optics and photonics Environmental test methods Part 20: Humid atmosphere containing sulfur dioxide or hydrogen sulfideBS ISO 9022-20:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 9022-20:2015. It supersede
2、s BS ISO 9022-20:1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee CPW/172, Optics and Photonics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all th
3、e necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 86791 0 ICS 37.020 Compliance with a British Standard cannot confer immunity from legal obligations. This British St
4、andard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2015. Amendments issued since publication Date Text affectedBS ISO 9022-20:2015 ISO 2015 Optics and photonics Environmental test methods Part 20: Humid atmosphere containing sulfur dioxide or hydrogen
5、 sulfide Optique et photonique Mthodes dessais denvironnement Partie 20: Atmosphre humide contenant du dioxyde de soufre ou de lhydrogne sulfur INTERNATIONAL STANDARD ISO 9022-20 Second edition 2015-03-01 Reference number ISO 9022-20:2015(E)BS ISO 9022-20:2015ISO 9022-20:2015(E)ii ISO 2015 All right
6、s reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prio
7、r written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzer
8、landBS ISO 9022-20:2015ISO 9022-20:2015(E)Foreword iv Introduction vi 1 Scope . 1 2 Normative references 1 3 General requirements . 1 4 Conditioning 1 4.1 Conditioning method 41: Humid atmosphere containing sulfur dioxide (SO 2 ) . 2 4.2 Conditioning method 42: Humid atmosphere containing hydrogen s
9、ulfide (H 2 S) . 2 5 Procedure. 2 5.1 General . 2 5.2 Preconditioning 2 6 Environmental test code . 2 7 Specification 3 Annex A (informative) Explanatory notes . 4 Bibliography 6 ISO 2015 All rights reserved iii Contents PageBS ISO 9022-20:2015ISO 9022-20:2015(E) Foreword ISO (the International Orga
10、nization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been establis
11、hed has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization
12、. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with t
13、he editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any pat
14、ent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. Fo
15、r an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information The committee responsible for
16、 this document is ISO/TC 172, Optics and photonics, Subcommittee SC 1, Fundamental standards. This second edition cancels and replaces the first edition (ISO 9022-20:1997), of which it constitutes a minor revision. ISO 9022 consists of the following parts, under the general title Optics and photonic
17、s Environmental test methods: Part 1: Definitions, extent of testing Part 2: Cold, heat and humidity Part 3: Mechanical stress Part 4: Salt mist Part 6: Dust Part 7: Resistance to drip or rain Part 8: High internal pressure, low internal pressure, immersion Part 9: Solar radiation and weathering Par
18、t 11: Mould growth Part 12: Contamination Part 14: Dew, hoarfrost, ice Part 17: Combined contamination, solar radiation Part 20: Humid atmosphere containing sulfur dioxide or hydrogen sulfideiv ISO 2015 All rights reservedBS ISO 9022-20:2015ISO 9022-20:2015(E) Part 22: Combined cold, dry heat or tem
19、perature change with bump or random vibration Part 23: Low pressure combined with cold, ambient temperature and dry and damp heat ISO 2015 All rights reserved vBS ISO 9022-20:2015ISO 9022-20:2015(E) Introduction Optical instruments are affected during their use by a number of different environmental
20、 parameters which they are required to resist without signification reduction in performance and to remain within defined specifications. The type and severity of these parameters depend on the conditions of use of the instrument (for example, in the laboratory or workshop) and on its geographical l
21、ocation. The environmental effects on optical instrument performance in the tropics and subtropics are totally different from those found when they are used in arctic regions. Individual parameters cause a variety of different and overlapping effects on instrument performance. The manufacturer attem
22、pts to ensure, and the user naturally expects, that instruments will resist the likely rigours of their environment throughout their life. This expectation can be assessed by exposure of the instrument to a range of simulated environmental parameters under controlled laboratory conditions. The sever
23、ity of these conditions is often increased to obtain meaningful results in a relatively short period of time. In order to allow assessment and comparison of the response of optical instruments to appropriate environmental conditions, ISO 9022 contains details of a number of laboratory tests which re
24、liably simulate a variety of different environments. The tests are based largely on IEC standards, modified where necessary to take into account features special to optical instruments. As a result of continuous progress in all fields, optical instruments are no longer only precision- engineered opt
25、ical products, but, depending on their range of application, also contain additional assemblies from other fields. For this reason, the principal function of the instrument is to be assessed to determine which International Standard should be used for testing. If the optical function is of primary i
26、mportance, then ISO 9022 is applicable, but if other functions take precedence then the appropriate International Standard in the field concerned should be applied. Cases can arise where application of both ISO 9022 and other appropriate International Standards will be necessary.vi ISO 2015 All righ
27、ts reservedBS ISO 9022-20:2015Optics and photonics Environmental test methods Part 20: Humid atmosphere containing sulfur dioxide or hydrogen sulfide 1 Scope This part of ISO 9022 specifies the methods relating to the environmental tests of optical instruments including additional assemblies from ot
28、her fields (e.g. mechanical, chemical, and electronic devices), under equivalent conditions, for their ability to resist the influence of sulfur dioxide (SO 2 ) or hydrogen sulfide (H 2 S) in a humid atmosphere. The purpose of the testing is to investigate to what extent optical, climatic, mechanica
29、l, chemical, and electrical performance characteristics of the specimen are affected by sulfur dioxide or hydrogen sulfide. This part of ISO 9022 is not applicable to the testing of material and surface coatings for their corrosion resistance using high concentrations of sulfur dioxide, for which re
30、presentative samples are generally used as specimens. The appropriate material standards apply to tests of this type. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only
31、 the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 9022-1, Optics and photonics Environmental test methods Part 1: Definitions, extent of testing 3 General requirements The sulfur dioxide and the hydrogen sulfide
32、used as the test gases shall be chemically pure, taken from commercially available compressed gas cylinders. A suitable test facility is described in Annex A. The test specimen shall not be exposed to direct sunlight during conditioning. No condensation shall be produced in the test chamber or on th
33、e specimen itself during conditioning. Prior to insertion into the test chamber, the test specimen shall therefore be heated to 2 K or 3 K above the temperature of the test chamber which has already been set to the test temperature. If several specimens are to be tested at the same time, they shall
34、not touch each other or the walls of the test chamber. The total volume of the specimens shall not be more than 50 % of the volume of the test chamber (exposure zone). The required conditioning values shall be attained by the test specimen(s) within 2 h after commencement of the test. The test shall
35、 not be interrupted during the required exposure time. When the test gases are changed, the test gas last used shall be exhausted in its entirety from the test chamber. No materials which absorb sulfur dioxide or hydrogen sulfide shall be used in the test chamber. 4 Conditioning The required exposur
36、e time shall begin as soon as the required conditioning values have been attained in the test chamber. INTERNATIONAL ST ANDARD ISO 9022-20:2015(E) ISO 2015 All rights reserved 1BS ISO 9022-20:2015ISO 9022-20:2015(E) 4.1 Conditioning method 41: Humid atmosphere containing sulfur dioxide (SO 2 ) See T
37、able 1. Table 1 Degrees of severity for conditioning method 41: Humid atmosphere containing sulfur dioxide (SO 2 ) Degree of severity 01 02 03 04 05 06 07 08 SO 2content of test atmosphere, cm 3 /m 3 1 to 2 20 to 30 10 to 15 Test chamber temperature, C 25 2 35 2 Relative humidity, % 70 to 80 Exposur
38、e time, days 21 56 4 10 21 1 4 10 State of operation 1 or 2 a aMainly for checking electrical functional safety. 4.2 Conditioning method 42: Humid atmosphere containing hydrogen sulfide (H 2 S) See Table 2. Table 2 Degrees of severity for conditioning method 42: Humid atmosphere containing hydrogen
39、sulfide (H 2 S) Degree of severity 01 02 03 04 05 06 07 08 09 H 2 S content of test atmosphere, cm 3 /m 3 0,5 to 1 10 to 15 4 to 6 Test chamber temperature, C 25 2 35 2 Relative humidity, % 70 to 80 Exposure time, days 21 56 1 4 10 21 1 4 10 State of operation 1 or 2 a aMainly for checking electrica
40、l functional safety. 5 Procedure 5.1 General The test shall be conducted in accordance with the requirements of the relevant specification and with ISO 9022-1. 5.2 Preconditioning If not specified in the relevant specification, the greasing of areas at risk of corrosion as stipulated in ISO 9022-1 s
41、hall not be required. 6 Environmental test code The environmental test code shall be as defined in ISO 9022-1, giving a reference to ISO 9022 and the codes for the conditioning method chosen, the degree of severity and the state of operation. EXAMPLE The environmental test of optical instruments for
42、 their resistance to sulfur dioxide in a humid atmosphere, in accordance with conditioning method 41, degree of severity 02, state of operation 1, is identified as:Environmental test ISO 9022-41-02-12 ISO 2015 All rights reservedBS ISO 9022-20:2015ISO 9022-20:2015(E) 7 Specification The relevant spe
43、cification shall contain the following details: a) environmental test code; b) number of specimens; c) preconditioning; d) type and scope of initial test; e) period of operation for state of operation 2; f) type and scope of intermediate test for state of operation 2; g) recovery; h) type and scope
44、of final test; i) criteria for evaluation; j) type and scope of test report. ISO 2015 All rights reserved 3BS ISO 9022-20:2015ISO 9022-20:2015(E) Annex A (informative) Explanatory notes A.1 General Many standards recommend the exclusive use of representative samples to test the resistance of materia
45、ls and coatings to humid atmospheres containing sulfur dioxide or hydrogen sulfide. Moreover, 40 C, 100 % relative humidity and, for example, a sulfur dioxide concentration of 200 mg/m 3to 300 mg/m 3are stipulated for the corrosive atmosphere. Exposure to such extreme conditions is totally unsuitabl
46、e for complete optical instruments or optical assemblies and is extremely unlikely in natural environmental conditions. It does not even bear any relation to the behaviour of operative instruments or assemblies and is an extremely polluted atmosphere in natural environmental conditions. IEC 721- 3-4
47、 defines the maximum content of sulfur dioxide in the highly polluted atmosphere surrounding industrial facilities emitting chemical substances to be 40 mg/m 3(15 cm 3 /m 3 ). If the values mentioned above as defined in IEC 721-3-4 are used for the test and the severity of conditioning is increased
48、to obtain the necessary acceleration, the degrees of conditioning severity by conditioning method 41 are obtained and can be related to natural environmental conditions. Agreement with the test values stipulated by IEC 60068-2-42 would be closely matched. The experience gained in practice with IEC 6
49、0068-2-42 for electronic products can also be applied to a large extent to optical instruments. A.2 Test facility The test facility shown in Figure A.1 is recommended for conditioning of optical instruments or assemblies in a humid atmosphere containing sulfur dioxide or hydrogen sulfide. The atmosphere in the test chamber shall be replaced two to four times an hour. The sulfur dioxide or hydrogen sulfide concentration in the test atmosphere shall be kept constant using the baffle p
