1、BRITISH STANDARD BS EN 61300-2-27: 1997 IEC 61300-2-27: 1995 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 2.27: Tests Dust Laminar flow The European Standard EN 61300-2-27:1997 has the status of a British Standard ICS 33.180.20BSEN61300-2-27:1
2、997 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15October 1997 BSI 09-1999 ISBN 0 580 28570 7 National foreword This British Standard is the English language versi
3、on of EN 61300-2-27:1997. It is identical with IEC 61300-2-27:1995. The UK participation in its preparation was entrusted by Technical Committee EPL/86, Fibre optics, to Subcommittee EPL/86/2, Interconnecting devices and passive components, which has the responsibility to: aid enquirers to understan
4、d the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this
5、 subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publicati
6、ons may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement
7、 these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the neces
8、sary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN ti
9、tle page, pages2 to4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN61300-2-27:1997 BSI 09-1999 i Co
10、ntents Page National foreword Inside front cover Foreword 2 1 General 3 1.1 Scope and object 3 1.2 General description 3 2 Apparatus 3 3 Procedure 3 4 Severity 3 5 Details to be specified 4ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61300-2-27 August 1997 ICS 33.180.20 English versi
11、on Fibre optic interconnecting devices and passivecomponents Basic test and measurement procedures Part 2-27: Tests Dust Laminar flow (IEC 61300-2-27:1995) Dispositifs dinterconnexion et composantspassifs fibres optiques Mthodesfondamentales dessais et de mesures Partie 2-27: Essais Poussire Ecoulem
12、entlaminaire (CEI 61300-2-27:1995) Lichtwellenleiter Verbindungselemente und passive Bauteile Grundlegende Prf- und Meverfahren Teil 2-27: Prfungen: Staub Laminare Strmung (IEC 61300-2-27:1995) This European Standard was approved by CENELEC on 1997-07-01. CENELEC members are bound to comply with the
13、 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
14、 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 offici
15、al versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical
16、 Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-2-
17、27:1997 EEN61300-2-27:1997 2 BSI 09-1999 Foreword The text of the International Standard IEC 61300-2-27:1995, prepared by SC 86B, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the formal vote and was approved by CENELEC as EN 61300-2-27 on 1
18、997-07-01 without any modification. The following dates were fixed: Endorsement notice The text of the International Standard IEC 61300-2-27:1995 was approved by CENELEC as a European Standard without any modification. latest date by which the EN has to be implemented at national level by publicatio
19、n of an identical national standard or by endorsement (dop) 1998-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1998-06-01EN61300-2-27:1997 BSI 09-1999 3 1 General 1.1 Scope and object The purpose of this part of IEC 1300 is to determine the effe
20、cts of dust on fibre optic devices. 1.2 General description The specimen is exposed to a specified dust concentration within a conditioning chamber in which the air is circulated over a period of time. 2 Apparatus The apparatus consists of the following elements. 2.1 Test chamber The test chamber sh
21、all be capable of controlling the dust concentration, velocity, temperature, and humidity of the dust-laden air. It shall be capable of being raised to and maintained at a temperature of63 C 2 C with a relative humidity not exceeding 60 %. In order to provide adequate circulation of the dust-laden a
22、ir, no more than 50 % of the cross-sectional area (normal to the air flow) and no more than 30 % of the volume of the chamber shall be occupied by the test specimen. The dust-laden air shall be introduced into the chamber in such a manner as to allow it to become approximately laminar in flow before
23、 it strikes the specimen. 2.2 Dust The dust shall be capable of passing through a sieve of 150 4m aperture. 3 Procedure The preparation of the specimen shall be in accordance with the detail specification. Unless otherwise specified, the specimen shall be subjected to the test in a non-operational m
24、ode. 3.1 Position the specimen as near to the centre of the test chamber as practicable. If more than one specimen is being tested, there shall be a minimum clearance of 100 mm between surfaces of the specimens and any other object or material which would provide protection. No surface of the test s
25、pecimen shall be any closer than 100 mm to any wall of the test chamber. The test specimen shall be orientated to expose the most critical or vulnerable parts to the dust stream. Changes in specimen orientation during the test shall be specified in the detail specification. 3.2 Set the chamber contr
26、ols to maintain an internal chamber temperature of 23 C 2 C and a relative humidity of less than 22 %. Adjust the air velocity to 530 m/min 70 m/min. Adjust the dust feeder to control the dust concentration to the specified severity. Maintain these chamber conditions for the specified duration. 3.3
27、Upon completion of the initial conditioning period, stop the dust feed and reduce the air velocity to 90 m/min 50 m/min. Raise the internal chamber temperature to 63 C 2 C. Maintain a relative humidity of less than 10 %. Maintain these chamber conditions for the specified duration. 3.4 Upon completi
28、on of the intermediate conditioning period, maintain the temperature at63 C 2 C. Increase the air velocity to 530 m/min 70 m/min. Adjust the dust feeder to control the dust concentration to the specified severity. Maintain a relative humidity of less than10 %. Maintain these chamber conditions for t
29、he specified duration. 3.5 Upon completion of the test, turn off all chamber controls and allow the specimen to return to standard ambient conditions. Remove accumulated dust from the specimen by brushing, wiping or shaking, exercising care to avoid introducing any additional dust into the test spec
30、imen. Dust shall not be removed by either air blast or vacuum cleaning. 3.6 The specimen shall be examined and all necessary observations recorded as specified in the detail specification. Careful attention shall be given to those specimens which contain bearings, seals, lubricants, etc. Where appli
31、cable, prior to remating interconnecting devices, normal cleaning procedures may be used to remove any residual dust. 4 Severity The severity consists of the dust concentration and duration of exposure. The severity shall be specified in the detail specification. The following preferred severities a
32、re non-mandatory severities which may be specified for this procedure: Dustconcentration Duration g/m 3 h 1 2 10,6 7,1 4 6 8 25 5 12 16 24EN61300-2-27:1997 4 BSI 09-1999 5 Details to be specified The following details, as applicable, shall be specified in the detail specification: Duration of exposu
33、re Change in orientation of specimen(s) Specimen optically functioning or non-functioning Specimen mated or unmated Dust characteristics (e.g. type size) Pre-conditioning procedure Post-conditioning procedure Initial examinations and measurements and performance requirements Examinations and measure
34、ments during test and performance requirements Final examinations and measurements and performance requirements Deviations from test procedure Additional pass/fail criteria5 blankBS EN 61300-2-27: 1997 IEC 61300-2-27: 1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI i
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