1、 IEC 60068-2-18 Edition 3.0 2017-03 REDLINE VERSION Environmental testing Part 2-18: Tests Test R and guidance: Water IEC 60068-2-18:2017-03 RLV(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2017 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part
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10、us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. IEC 60068-2-18 Edition 3.0 2017-03 REDLINE VERSION Environmental testing Part 2-18: Tests Test R and guidance: Water INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 19.040 ISBN 978-2
11、-8322-4106-6 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 60068-2-18:2017 RLV IEC 2017 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope and object . 8 2 Normative referenc
12、es 8 3 Terms and definitions 8 4 Survey of water tests . 9 4.1 General . 9 4.2 Description of tests R: water . 9 5 Test Ra: falling drops 10 5.1 Object . 10 5.2 Method Ra 1: artificial rain 10 5.2.1 General description of the test . 10 5.2.2 Severities 11 5.2.3 Preconditioning 11 5.2.4 Initial measu
13、rements . 11 5.2.5 Testing 11 5.2.6 Recovery . 12 5.2.7 Final measurements 12 5.2.8 Information to be given in the relevant specification . 12 5.3 Method Ra 2: drip box . 13 5.3.1 General description of the test . 13 5.3.2 Severities 13 5.3.3 Preconditioning 14 5.3.4 Initial measurements . 14 5.3.5
14、Testing 14 5.3.6 Recovery . 14 5.3.7 Final measurements 14 5.3.8 Information to be given in the relevant specification . 14 6 Test Rb: impacting water . 15 6.1 Object . 15 6.2 Method Rb 1: oscillating tube and spray nozzle . 15 6.2.1 General description of the test . 15 6.2.2 Method Rb 1.1: oscillat
15、ing tube 15 6.2.3 Method Rb 1.2: spray nozzle . 19 6.3 Method Rb 2: water jet 21 6.3.1 General description of the test . 21 6.3.2 Severities 21 6.3.3 Preconditioning 22 6.3.4 Initial measurements . 22 6.3.5 Testing 22 6.3.6 Recovery . 22 6.3.7 Final measurements 23 6.3.8 Information to be given in t
16、he relevant specification . 23 6.4 Method Rb 3: fan jet . 23 6.4.1 General description of the test . 23 6.4.2 Severities 24 IEC 60068-2-18:2017 RLV IEC 2017 3 6.4.3 Preconditioning 24 6.4.4 Initial measurements . 24 6.4.5 Testing 24 6.4.6 Recovery . 24 6.4.7 Final measurements 24 6.4.8 Information t
17、o be given in the relevant specification . 25 7 Test Rc: immersion 25 7.1 Object . 25 7.2 Method Rc 1: water tank . 25 7.2.1 General description . 25 7.2.2 Severities 25 7.2.3 Preconditioning 26 7.2.4 Initial measurements . 26 7.2.5 Testing 26 7.2.6 Recovery . 26 7.2.7 Final measurements 26 7.2.8 In
18、formation to be given in the relevant specification . 26 7.3 Method Rc 2: pressurized water chamber . 27 7.3.1 General description of the test . 27 7.3.2 Severities 27 7.3.3 Preconditioning 27 7.3.4 Initial measurements . 27 7.3.5 Testing 27 7.3.6 Recovery . 28 7.3.7 Final measurements 28 7.3.8 Info
19、rmation to be given in the relevant specification . 28 Annex A (informative) Water characteristics to be considered when writing the relevant specification 29 A.1 General . 29 A.2 Purity 29 A.2.1 General . 29 A.2.2 Effect on test specimen . 29 A.2.3 Effect on test apparatus . 29 A.2.4 Ingress of wat
20、er into the specimen 30 A.3 Water quality for tests R . 30 A.3.1 Test Ra: falling drops. 30 A.3.2 Test Rb: impacting water . 30 A.3.3 Test Rc: immersion 30 Annex B (informative) General guidance 31 B.1 General . 31 B.2 Factors affecting the test severity . 31 Annex C (informative) Guidance for test
21、Ra . 32 C.1 General . 32 C.2 Example of test apparatus 32 C.2.1 Method Ra 1: artificial rain . 32 C.2.2 Method Ra 2: drip box . 33 C.3 Verification of test apparatus 34 C.3.1 Intensity . 34 C.3.2 Drop size . 34 4 IEC 60068-2-18:2017 RLV IEC 2017 C.3.3 Resistivity and pH value 34 Annex D (informative
22、) Guidance for test Rb . 36 D.1 General . 36 D.2 Example of test apparatus 36 D.2.1 Method Rb 1: oscillating tube and spray nozzle . 36 D.2.2 Method Rb 2: water jet . 37 D.2.3 Method Rb 3: fan jet nozzle . 38 Annex E (informative) Guidance for test Rc 45 E.1 General . 45 E.2 Example of test apparatu
23、s 45 E.2.1 Method Rc 1: water tank 45 E.2.2 Method Rc 2: pressurized water chamber 45 E.3 Verification of test apparatus 45 Bibliography 46 Figure 1 Structuring of test methods and equivalence with the IP Code of IEC 60529 10 Figure 2 Test Ra, definitions of angles and axes 12 Figure C.1 Test Ra 1,
24、test apparatus and measurement setup for drop sizes and intensity for artificial rain method 33 Figure C.2 Test Ra 2, recommended test apparatus for the drip box method 35 Figure D.1 Test Rb 1.1, recommended test apparatus for the oscillating tube method . 37 Figure D.2 Distribution of mean value of
25、 precipitation intensity in the oscillating tube area for the above-specified measurement conditions . 39 Figure D.3 Test Rb 1.2, recommended test apparatus for the spray nozzle method 40 Figure D.4 Standard test nozzle for the water jet method (hose nozzle) . 40 Figure D.5 Standard test nozzle for
26、the fan jet method . 41 Figure D.6 Fan jet nozzle resulting dimensions of spraying hole for checking purpose . 41 Figure D.7 Example of different quality achievements of the surface finish of the fan jet nozzle 42 Figure D.8 Set-up for measuring the impact force of the water jet for determining the
27、protection against high-pressure and high-temperature water jets . 43 Figure D.9 Impact force distribution . 43 Figure D.10 Test setup for determining the protection against high-pressure and high-temperature water jet for small enclosures 44 Table 1 Oscillating tube Relationship of number of nozzle
28、s and total water flow to tube radius 17 Table A.1 Typical characteristics of water with approximate values 30 IEC 60068-2-18:2017 RLV IEC 2017 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ENVIRONMENTAL TESTING Part 2-18: Tests Test R and guidance: Water FOREWORD 1) The International Electrotechnic
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41、ditions are in green text, deletions are in strikethrough red text. 6 IEC 60068-2-18:2017 RLV IEC 2017 International Standard IEC 60068-2-18 has been prepared by IEC technical committee 104: Environmental conditions, classification and methods of test. This third edition cancels and replaces the sec
42、ond edition published in 2000. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) addition of the new test method Rb 3. The text of this standard is based on the following documents: FDIS Report on
43、 voting 104/719/FDIS 104/722/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60068 series, publi
44、shed under the general title Environmental testing, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch“ in the data related to the specific publicati
45、on. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. User
46、s should therefore print this document using a colour printer. IEC 60068-2-18:2017 RLV IEC 2017 7 INTRODUCTION It is the intention of this part of IEC 60068 to fulfil the function of a basic publication 1)by making water tests available to product committees. A number of water tests are described in
47、 other IEC publications. Some of them are well established, for example, the test for classification of the second characteristic numeral of the IP Code, of IEC 60529. This document incorporates the majority of the most widely used tests, as well as making available further methods and increasing th
48、e number of severities. _ 1)IEC Guide 108:1994, The relationship between technical committees with horizontal functions and product committees and the use of basic publications 8 IEC 60068-2-18:2017 RLV IEC 2017 ENVIRONMENTAL TESTING Part 2-18: Tests Test R and guidance: Water 1 Scope and object Thi
49、s part of IEC 60068 provides methods of test applicable to products which, during transportation, storage or in service, may can be subjected to falling water drops, impacting water, immersion or high pressure water impact. The primary purpose of water tests is to verify the ability of enclosures, covers and seals to maintain components and equipment in good working order after and, when necessary, under a standardized drop field or immersion in water. These
