BS EN 60068-2-17-1995 Environmental testing - Test methods - Test Q Sealing《环境试验 试验方法 试验Q 密封》.pdf

1、BRITISH STANDARD BSEN 60068-2-17: 1995 IEC68-2-17: 1994 Environmental testing Part 2: Tests Test Q: Sealing The European Standard EN60068-2-17:1994 has the status of a BritishStandard This Part should be read on conjunction with BS2011-1.1:1989 General and guidance UDC 621.3:620.193:620.162.4BSEN600

2、68-2-17:1995 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 15 May1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee referen

3、ce GEL/50 Draft for comment 92/21483 DC ISBN 0 580 23580 7 Committees responsible for this British Standard The United Kingdom participation in the preparation in this British Standard was entrusted to Technical Committee GEL/50, Environmental testing of electrotechnical products, upon which the fol

4、lowing bodies were represented: Federation of the Electronics Industry GAMBICA (BEAMA Ltd.) Ministry of Defence Society of Environmental Engineers Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date CommentsBS EN60068-2-17:1995 BSI 01-2000 i Contents

5、Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 60068-2-17 5BSEN60068-2-17:1995 ii BSI 01-2000 National foreword This British Standard has been prepared by Technical Committee GEL/50 and is the English Language version of EN 60068-2-17:1994 Environmental tes

6、ting, Part 2: Tests, Test Q. Sealing, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC68-2-17:1994 published by the International Electrotechnical Commission(IEC). This British Standard supersedes BS2011-2.1Q:1981 which is withdrawn. A Brit

7、ish Standard does not purport to include all the necessary 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 fron

8、t cover, an inside front cover, pagesi andii, theENtitle page, pages2 to38 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.EUROPEAN STANDARD NORME EUROPENNE EUROPIS

9、CHE NORM EN 60068-2-17 August 1994 UDC 621.3:620.193:620.162.4 Descriptors: Electricity, components, equipment, mechanical test, definitions, sealing test, procedures, components specifications writing, equipment specifications writing English version Environmental testing Part 2: Tests Test Q: Seal

10、ing (IEC 68-2-17:1994) Essais d environmenement Partie 2: Essais Essai Q: Etanchit (CEI 68-2-17:1994) Umweltprfungen Teil 2: Prfungen Prufung Q: Dichteheit (IEC 68-2-17:1994) This European Standard was approved by CENELEC on 1994-03-08. CENELEC members are bound to comply with the CEN/CENELEC Intern

11、al 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 to any CENELEC mem

12、ber. 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 official versions. CENELE

13、C 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 Standardization Co

14、mit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN 60068-2-17:1994 EEN60068-2-17:1994 BSI 01-2000 2 Foreword At the request of CENELEC Reporting

15、 Secretariat SR50, the International Standard IEC68-2-17:1978 and its amendment4:1991 (incorporating amendments1:1985,2:1987 and3:1989) was submitted to the CENELEC Unique Acceptance Procedure (UAP) in May1993 for acceptance as a European Standard. The text of document50 (CO)261, as prepared by IEC

16、Technical Committee50, Environmental testing, was submitted to the IEC-CENELEC parallel vote in May1993. The combined text of the International Standard with its four amendments and50(CO)261 was approved by CENELEC as EN60068-2-17 on 1994-03-08. This European Standard replaces HD323.2.17 S4:1990. Th

17、e following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A to Annex H are all normative. IEC529:1989, Degrees of protection provided by enclosures (IP Code), which is quoted in this standard, has been harmonized by CENELEC as EN60529:

18、1991. Contents Page Foreword 2 1 Definitions 8 2 Test Qa: Sealing of bushes, spindles and gaskets 9 2.1 Object 9 2.2 Scope 9 2.3 General description of the test 9 2.4 Initial measurements 9 2.5 Conditioning 9 2.6 Final measurements 9 2.7 Information to be given in the relevant specification 9 3 Test

19、 Qc: Container sealing, gas leakage 9 3.1 Object 9 3.2 Scope 9 3.3 General description of the test 10 3.4 Test Method 1 10 3.5 Test Method 2 10 3.6 Test Method 3 10 3.7 Information to be given in the relevant specification 11 4 Test Qd: Container sealing, seepage of filling liquid 11 4.1 Object 11 4

20、.2 Scope 11 4.3 General description of the test 11 4.4 Severities 11 4.5 Preconditioning 12 4.6 Initial measurements 12 4.7 Conditioning 12 4.8 Final measurements 12 4.9 Information to be given in the relevant specification 12 5 Test Qf: Immersion 12 5.1 Object 12 5.2 General description of the test

21、 12 5.3 Initial measurements 12 5.4 Preconditioning 12 5.5 Conditioning 12 5.6 Recovery 13 5.7 Final measurements 13 5.8 Information to be given in the relevant specification 13 6 Test Qk: Sealing tracer gas method with mass spectrometer 13 latest date of publication of an identical national standar

22、d (dop) 1995-04-01 latest date of withdrawal of conflicting national standards (dow) 1995-04-01EN60068-2-17:1994 BSI 01-2000 3 Page 6.1 Object 13 6.2 Scope 14 6.3 General description of the test 14 6.4 Test method 1 (for specimens not filled with helium during manufacturing) 14 6.5 Test Method 2 (fo

23、r specimens filled with helium during manufacturing or for the requirements of this test) 15 6.6 Test Method 3 (applicable to specimens to be mounted on bulkheads or panels) 16 6.7 Information to be given in the relevant specification 17 7 Test Ql: Bomb pressure test 19 7.1 Object 19 7.2 Scope 19 7.

24、3 General description of the test 19 7.4 Initial measurements 19 7.5 Conditioning 19 7.6 Recovery 19 7.7 Final measurements 19 7.8 Information to be given in the relevant specification 20 8 Test Qm: Tracer gas sealing test with internal pressurization 20 8.1 Object 20 8.2 Scope 20 8.3 General descri

25、ption of the test 20 8.4 Pre-conditioning 20 8.5 Conditioning 21 8.6 Information to be given in the relevant specification 22 9 Test Qy: Pressure rise sealing test 22 9.1 Object 22 9.2 Scope 22 9.3 General description of the test 22 9.4 Calibration of the test equipment 23 9.5 Information to be give

26、n in the relevant specification 23 Annex A (normative) Example of a test chamber for Test Qa 26 Annex B (normative) Guidance for Test Qc 28 Annex C (normative) Guidance for Test Qd 30 Annex D (normative) Interrelation of test parameters for Test Qk 30 Annex E (normative) Guidance for Test Qk 33 Page

27、 Annex F (normative) Guidance for Test Ql 35 Annex G (normative) Guidance for Test Qm 35 Annex H (normative) Guidance for Test Qy 37 Figure 1 6 Figure 2 Typical installation for sealing test using the pressure rise test procedure 23 Figure 3 Pressure of volume of measurement versus time during the s

28、ealing test using the pressure rise test procedure 24 Figure 4 Limiting cases of the pressure of volume of measurement versus test time, provided that the dimensions of the test device, the volume of measurement and the evacuation time are constant 25 Figure A.1 (Test Qa) Chamber for sealing test 27

29、 Figure A.2 (Test Qa) Apparatus for sealing test 28 Figure D.1 Nomogram for determination of test parameters 32 Table 1 Degrees of protection indicated by the first characteristic numeral 7 Table 2 Degrees of protection indicated by the second characteristic numeral 7 Table 3 13 Table 4 Severities a

30、nd test conditions (and corresponding equivalent standard leak rates) 184 blankEN60068-2-17:1994 BSI 01-2000 5 General This survey indicates the interrelation between the various tests for sealing in Test Q of IEC68. Other tests of this category are rain and water tests which are to be included as t

31、ests R. At the same time the opportunity has been taken to make reference to similar tests in IEC529. Tests in IEC68-2-17 Test Q: Sealing, includes a number of tests which use different conditioning procedures appropriate for different applications. The family tree of all sealing tests is shown in F

32、igure 1. Test Q may be subdivided in the following two sub-groups, distinguished by their detection methods, viz: internal detection, which measures changes of electrical characteristics produced by the test medium (liquid or gas) introduced into the specimens through the leak; external detection, w

33、hereby the escape of the test medium through the leak is observed. The two tests for internal detection Qf and Ql are very similar. They are very effective for certain components, for example plastic foil capacitors; they are not recommended, however, for components in which electrical changes becom

34、e effective only after a long time (for instance, after the test is terminated). The tests for external detection are further subdivided according to their application. Test Qa is a bubble test which is used to determine the air tightness of bushes, spindles and gaskets. The other tests, Qc, Qd, Qk

35、and Qm are used to determine leaks in containers (metallic cases, housings, etc.); Test Qc is a bubble test again including three methods with different sensitivities leaks not less than1Pacm 3 /s (10 5barcm 3 /s). Test Qk and Qm are the most sensitive of this series. Their sensitivity ranges from1P

36、a.cm 3 /s (10 5barcm 3 /s) to about10 6 Pacm 3 /s (10 11barcm 3 /s). Test Qd is a liquid seepage test which may be applied to specimens filled during manufacture with a liquid or a product becoming liquid at the test temperature. Tests in IEC529 In IEC529, degrees of protection are established by te

37、sts and identified by numerals as follows:EN60068-2-17:1994 6 BSI 01-2000 Figure 1 EN60068-2-17:1994 BSI 01-2000 7 Table 1 Degrees of protection indicated by the first characteristic numeral Table 2 Degrees of protection indicated by the second characteristic numeral First characteristic numeral Deg

38、ree of protection Short description Definition 0 Non-protected No special protection 1 Protected against solid objects greater than50mm A large surface of the body, such as a hand (but no protection against deliberate access). Solid objects exceeding50mm in diameter 2 Protected against solid objects

39、 greater than12mm Fingers or similar objects not exceeding80mm in length. Solid objects exceeding12mm in diameter 3 Protected against solid greater than2,5mm Tools, wires, etc., of diameter or thickness greater than2,5mm. Solid objects exceeding2,5mm in diameter 4 Protected against solid objects gre

40、ater than1,0mm Wires or strips of thickness greater than1,0mm. Solid objects exceeding1,0mm in diameter 5 Dust-protected Ingress of dust is not totally prevented but dust does not enter in sufficient quantity to interfere with satisfactory operation of the equipment 6 Dust-tight No ingress of dust S

41、econd characteristic numeral Degree of protection Short description Definition 0 Non-protected No special protection 1 Protected against dripping water Dripping water (vertically falling drops) shall have no harmful effect 2 Protected against dripping water when tilted up to15 Vertically dripping wa

42、ter shall have no harmful effect when the enclosure is tilted at any angle up to15 from its normal position 3 Protected against spraying water Water falling as a spray at an angle up to60 from the vertical shall have no harmful effect 4 Protected against splashing water Water splashed against the en

43、closure from any direction shall have no harmful effect 5 Protected against water jets Water projected by a nozzle against the enclosure from any direction shall have no harmful effect 6 Protected against heavy seas Water from heavy seas or water projected in powerful jets shall not enter the enclos

44、ure in harmful quantities 7 Protected against the effects of immersion Ingress of water in a harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time 8 Protected against submersion The equipment is suitable for continuous submersion

45、 in water under conditions which shall be specified by the manufacturer NOTENormally, this will mean that the equipment is hermetically sealed. However with certain types of equipment it can mean that water can enter but only in such a manner that it produces no harmful effectsEN60068-2-17:1994 8 BS

46、I 01-2000 1 Definitions For the purpose of this standard the following definitions apply: 1.1 leak rate the quantity of a dry gas at a given temperature that flows through a leak per unit of time and for known difference of pressure across the leak NOTEThe basic SI unit for leak rate is “pascal cubi

47、c metre per second (Pa m 3 /s)”. The derived units “Pa cm 3 /s” and “bar cm 3 /s” are used in this standard as they better conform with the orders of magnitude used in common industrial practice. It is recalled that:1Pa m 3 /s = 10 6Pa cm 3 /s =10bar cm 3 /s. 1.2 standard leak rate the leak rate und

48、er standard conditions of temperature and pressure difference for the purpose of this test, the standard conditions are25 C and10 5 Pa (1 bar) 1.3 measured leak rate (R) the leak rate of a given device as measured under specified conditions and employing a specified test gas NOTE 1Measured leak rate

49、s are often determined with helium employed as the test gas under a pressure difference of10 5 Pa (1bar) at25 C. NOTE 2For the purpose of comparison with leak rates determined by other methods of testing, the leak rates must be converted to equivalent standard leak rates. 1.4 equivalent standard leak rate (L) the standard leak rate of a given device, with air as the test gas 1.5 time constant (of leakage) (F) the time required for equalization of partial pressure difference across a leak if the initial