1、BRITISH STANDARD Environmental testing - BS EN 60068-2- 74: 2 O00 IEC 60068-2-74:1999 Part 2: Tests - I Wst Xc : Fluid contamination The European Standard EN 600682-74 1999 has the status of a British Standard ICs 19.040 I NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD-BS
2、I BS EN bb8-2-74-ENGL 2000 - Lb24bb9 0830370 074 BS EN 60068-2-742000 direction of the Electroterhnical Amd. No. D - present to the responsible intedonaYEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related internationa
3、l and European developments and promulgate them in the UK A lis of organizations represented on this committee can be obtained on request to its secretary. Flom 1 January 1997, ail IEC publications have the number 6O added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1.
4、 For a period of time during the change over from one numbering system to the other, publications may contain idenQfiers from both systems. Cross-references Attention is dram to the fact that CEN and CENELEC Standads normally include an annex which lists normative references to international publica
5、tions with their corresponding European publications. The British Standards which implement these international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Intemational Standards Correspondence Index“, or by using the
6、“Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contsact. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from l
7、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copynght notice displayed in this document indicates when the document was last issued. O BSI 03-2 I I ISBN O 580 35719 8 STDmBSI BS EN hOOhB-2-
8、74-ENGL 2000 Lb24hh7 0830373 T20 M EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60068-2-74 October 1999 ICs 19.040 English version Environmental testing Part 2: Tests - Test Xc: Fluid contamination (IEC 60068-2-74: 1 999) Essais denvironnement Partie 2: Essais - Essai Xc: Contamination par d
9、es fluides (CE1 60068-2-74: 1 999) Umweltprfungen Teil 2: Prfverfahren - Prfung Xc: Verunreinigung durch Flssigkeiten (IEC 60068-2-74: 1999) This European Standard was approved by CENELEC on 1999-1 0-01. CENELEC members are bound to comply with the CENICENELEC Internal Regulations which stipulate th
10、e 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 exist
11、s 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 electr
12、otechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de No
13、rmalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Centrai Secretariat: rue de Stassart 35, B - 1050 Brussels - 1999 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60068-2-74:1999 E - STDoBSI ES EN bOOb
14、8-2-74-ENGL 2DDO 1b24bb9 0830372 9b7 = Page 2 EN 60068-2-74: 1 999 Foreword The text of document 104/124/FDIS, future edition 1 of IEC 60068-2-74, prepared by IEC TC 104 Environmental conditions, classification and methods of test, was submitted to the IEC-CENELEC parallel vote and was approved by C
15、ENELEC as EN 60068-2-74 on 1999-10-01. 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 with the EN have to be withdrawn - latest date by which the national standards conflicting (
16、dopl 2000-07-01 (daw) 2002-1 0-01 Endorsement notice The text of the International Standard IEC 60068-2-74:1999 was approved by CENELEC as a European Standard without any modification. STD-BSI BS EN bDOb8-2-74-ENGL 2000 Lb24bb7 0830373 8T3 9 Page 3 EN 60068-2-74:1999 CONTENTS Page Clause 1 2 3 4 5 6
17、 7 8 9 Scope 4 Normative references . 4 Test fluid . 4 3.1 Specification of test fluid . 4 3.2 Precaution 4 Specimen 6 Cleaning 6 5.1 Initial cleaning 6 5.2 intermediate cleaning . 6 5.3 Final cleaning . 6 Initial examination 6 . 6 Occasional contamination (class A) 7 Intermittent contamination (cla
18、ss 8) . 7 10 Extended contamination (class C) 8 11 Final examination 8 12 Information to be given in the relevant specification . 8 Annex A (informative) Guidance on the choice of test fluids and specimens 9 Q BSJ w-mo STD-BSI BS EN bOOb8-2-74-ENGL 2000 m Lb24669 0830374 73T m Page 4 EN 60068-2-74:1
19、999 ENVIRONMENTAL TESTING - Part 2: Tests - Test Xc: Fluid contamination 1 Scope This part of IEC 60068 gives a method of test which provides a standard procedure to determine the ability of components, equipments or their constituent materials, hereinafter referred to as specimen, to withstand acci
20、dental contact with fluids, without being unacceptably affected. The fluids listed in this part of IEC 60068 are representative of those commonly encountered in operational applications. It is not intended that a specimen should be exposed to all, or even any of them. Nor is the list intended to be
21、complete; fluids not listed and for which a test is appropriate should be included in the relevant specification. Guidance is given in annex A on the choice of test fluids, specimens and severities. These tests are not intended to demonstrate the suitability of components or equipments to perform in
22、 continuous contact with a fluid, e.g. an immersed fuel pump. Nor are they a test to demonstrate immunity from electrolytic corrosion. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of IEC 60068. F
23、or dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of IEC 60068 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For un
24、dated references, the latest edition of the normative document referred to applies. Members of JEC and IS0 maintain registers of currently valid International Standards. IS0 181 7: 1985, Rubber, vulcanized - Determination of the effect of liquids 3 Test fluid 3.1 Specification of test fluid The rele
25、vant specification (see clause 12) shall specify the required test fluids which shall wherever possible be selected from the list given in table 1. Each fluid has been specified as being representative of a group of fluids. (See clause A.2.) The relevant specification shall also specify any addition
26、al fluids not listed in table 1 for which a test is required. 3.2 Precaution Since many fluids may have flash points within the test temperature range, care should be taken to ensure that adequate safety measures are taken to limit the possibility of fire or explosion. O BSI 03-2000 STD-BSI BS EN 60
27、068-2-74-ENGL 2000 H lb24669 0830375 b7b dels Page 5 Some fluids may themselves, or in combination with other fluids or the specimen, be toxic. Due consideration should be given to this possibility before commencing the tests. Consultation of a health and safety expert is strongly advised. EN 600 68
28、-2-7 4: 1 99 9 Kerosene (turbine) (a) IS0 1817 test liquid F 70 3, Gasoline (piston engine) (b) IS0 1817 test liquid B 40 3 Table 1 - Major contaminant fluid groups and test fluids I Silicone based (e) Dimethyl silicone, 10 mm2/s (cSt) at 25 “C 70 (ZX42; NATO S1714) Test fluid reference Contaminant
29、fluid group Ester based (synthetic) (9) IS0 1817 test liquid 101 Test fluid I 150 (i) (j) ydraulic Mineral oil based 1 (c) 1 NATO H-520; (OM18) 41 Jids I De-natured alcohol 23 Detergent 23 I 70 Iunway de-icers Phosphate ester based I (d) I IS0 1817 test liquid 103 I (synthetic) r - (i) Inhibited eth
30、anediol (ethylene glycol) with a 23 (rn) 25 % urea125 % ethanediol (ethylene glycol) in 23 (n) 50 % inhibited potassium acetate in water 4, 23 volume fraction of 50 YO in water water 4, I 70 :oolant dielectric fluid (see A.2.91 (p) D-phenothrin 2 YO solution in kerosene 23 (4) Coolanol 25R 70 ubrica
31、ting Mineral based ils (s) Fluoroprotein foam I (f) I NATO 0-1 176 (OMD 80) 23 I 70 olvents and cleaning fluids I (h) I Propan-2-01 (isopropyl alcohol) I 503 I 23 Inhibited ethanediol (ethylene glycol) with a I (k) I volume fraction of 80 % in water le-icing and anti-freeze fluids nsecticides I 23 D
32、ichlorvos (DDVP) pyrethrum based, I (O) I 2 O! solution in kerosene ?re extinguishants I (r) I Fluorochemical foam (rapid intervention) I 23 O BS1 03-2000 - STDmBSI BS EN bO068-2-74-ENGL 2000 Lb24bb9 083037b 502 Page 6 EN 60068-2-741999 4 Specimen 4.1 The specimen shall be either: a) an equipment; o
33、r b) a component NOTE 1 - Where size or availability of an equipment does not permit a full test, a specially selected representation of materials, finishes and components used in an equipment may be used as a specimen. NOTE 2 - Specimens for materials or finishes should have a minimum surface area
34、where possible of 20 cn? 4.2 The relevant specification shall specify the number and type of specimens to be tested (See clause A.4.) 5 Cleaning 5.1 Initial cleaning Unless otherwise specified in the relevant specification the specimen shall be thoroughly cleaned to remove unrepresentative coatings,
35、 for example preservatives, grease or contaminants. (See clause A.5.) 5.2 Intermediate cleaning If sequential testing is required, the relevant specification shall specify any necessary cleaning method. NOTE - It is essential that cleaning methods and cleaning fluids are chosen such that they do not
36、 affect the specimen. 5.3 Final cleaning The relevant specification shall specify any necessary cleaning method prior to final examination. (See clause A.5.) 6 Initial examination 6.1 The specimen shall be visually examined following initial cleaning, if required, and its condition recorded. 6.2 The
37、 relevant specification shall specify any measurements or tests required. (See clause A.6.) 7 Testing 7.1 Three test procedures are given in clauses 8 to 10. The relevant specification shall specify the test or tests to be used and the order of application of the test fluids if sequential testing is
38、 required. (See clause A.7.) NOTE - If sequential testing is specified care should be taken that there are no synergistic effects. 7.2 The relevant specification shall specify whether the specimen is to be connected electrically or mechanically and, if it is required to operate before, during or aft
39、er the procedure, the operating parameters shall also be defined. If an initial operating test is specified, it shall be carried out following the initial examination. O BSI 03-2000 STD-BSI BS EN 60068-2-74-ENGL 2000 H 1624669 0830377 449 Page 7 EN 60068-2-74:1999 8 Occasional contamination (class A
40、) 8.1 Mount the specimen in its normal operating configuration and maintain at room temperature, or as specified in the relevant specification. 8.2 Dip, brush or spray the relevant specimen with the specified fluid which shall be maintained at the test temperature given in table 1, or as specified i
41、n the relevant specification. Ensure that the entire surface of the specimen is thoroughly wetted. Allow the sample to drain naturally for 5 min to 10 min, shaking or wiping is not permitted. 8.3 Transfer the specimen into a suitable test chamber, mounted in its normal operating configuration if imp
42、ortant, and maintain at the test temperature for the time specified in the relevant specification. If not specified, the parameters shall be 70 “C f 2 “C for 93 h f 3 h. 8.4 At the end of the period allow the specimen to cool to room temperature before being subjected to final examination. 8.5 Repea
43、t this procedure, if and as required by the relevant specification. 9 Intermittent contamination (class B) 9.1 Mount the specimen in its normal operating configuration and maintain it at room temperature, or as specified in the relevant specification. 9.2 Dip, spray or brush the relevant specimen wi
44、th the specified fluid which shall be maintained at the test temperature given in table 1, or as specified in the relevant specification. Ensure that the entire surface of the specimen is wetted. Repeat this procedure one or more times as necessary to maintain all the specimen surfaces in a wetted c
45、ondition for the period prescribed in the relevant specification. If the period is not specified it shall be three cycles each of 24 h f 1 h. Each cycle shall consist of 8 h f 0,5 h in the fully wetted condition followed by a drain period of 16 h f 0,5 h at ambient temperature during which no additi
46、onal wetting shall occur. 9.3 Transfer the specimen into a suitable test chamber and maintain it at the test temperature and for the time specified in the relevant specification. If not specified, the parameters shall be 70 “C i 2 “C for 93 h f 3 h. 9.4 At the end of the period allow the specimen to
47、 cool to room temperature before being subjected to final examination. O BSI 03-2000 Page 8 EN 60068-2-74:1999 IO Extended contamination (class C) NOTE - This procedure is not intended to demonstrate the operation of an equipment which is normally immersed in a fluid. 10.1 Immerse the specimen fully
48、 in the specified test fluid which shall be maintained at the temperature and for the time stated in the relevant specification. If the temperature and/or duration are not specified, the temperature shall be as given in table 1, and the duration shall be 24 h f 1 h. 10.2 Transfer the specimen into a
49、 suitable test chamber and maintain it at the test temperature and for the time specified in the relevant specification. If not specified, the parameters shall be 70 “C f 2 “C for 93 h f 3 h. The fluid shall be allowed to drain off the specimen during this period and consideration shall be given to possible safety precautions. 10.3 At the end of the period allow the specimen to cool to room temperature before being subjected to final examination. 11 Final examination 11.1 The specimen shall be cleaned in accordance with 5.3. 11.2 Examine the specimen visually
