1、E Edition approved for publication 1992-06-05 CEN PREN*2591 (PART*C12) 92 3404584 0026892 T Comments should be sent within six months after the date of publication decision A.E.C.M.A. Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cdex - FRANCE A. E. C. M .A. STAN DAR D prEN
2、 2591 NORME A.E.C.M.A. A.E.C.M.A. NORM Part CI 2 issue P 1 June 1992 DIT PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex -Tl. (1 ) 47.36.98.76 UDC : Key words : ENGLISH VERSION Aerospace series Elemen
3、ts of electrical and optical connection Test methods Part CI 2 - Air leakage Srie arospatiale Luft- und Raumfahrt Mthodes dessais Prfverfahren Organes de connexion lectrique et optique Partie CI 2 - tanchit lair Elektrische und optische Verbindungselemente Teil CI 2 - Luftdichtheit This Aerospace Se
4、ries pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission following comment by the M
5、ember countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically ar functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Cent
6、re (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for final vote, Nota - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199. rile Jean-Jacques Rousseau - 92138
7、ISSY-LES-MOULINEAUX CEDEX C2 Chairman M. J. LE CUNFF I I aecma 1992 - CEN PREN*259L (PART*CL2) 92 3404589 002b893 1 M prEN 2591-C12 Page 3 1 Scope and field of application This standard specifies a method of checking the effectiveness of the seals for ensuring sealing at the interfaces : - mounting
8、panel shell, - shell insulation, - insulation contacts, - insulation wires, of elements of connection subjected to a differential air pressure. It shall be used together with EN 2591. 2 Reference EN 2591 Aerospace series - Elements of electrical and optical connection - Test methods - General c. . 3
9、 Preparation of the specimen 3.1 The specimens shall be wired and fitted with their accessories in accordance with the technical specification. The fixed connector shall be mounted in accordance with the technical specification on a test fixture which enables a pressure to be applied in either direc
10、tion. 3.2 Unless indicated in the technical specification, the following details shall be specified : - types of elements of connection, - type of cable, - type of rear accessory, - preconditioning : temperature and duration, c - applicable test methods, - pressure differential, - maximum limit of l
11、eakage for each method. , Previous page is blank CEN PREN*2591 (PART*CLZ) 92 = 3404589 0026894 3 prEN 2591-CI2 Page 4 4 Apparatus The leakage rate shall be measured by means of an appropriate apparatus (see the example of test apparatus figure 1). Test S lie c i m en Graduated Scale Air bubbles Figu
12、re 1 - Example of test apparatus .- Pressure 5 Method 5. I Preconditioning (if applicable) The technical specification may stipulate the exposure, before the test, of the specimen to a specified temperature for a given time. 5.2 Test procedure A pressure difference shall be generated between the fro
13、nt and rear faces of the element of connection. The technical specification shall indicate the test method applicable and the type of element of connection to be tested. To test a pair of elements of connection methods A and 3 shall be employed. 5.2.1 Method A - Leakage across sealed fixed connector
14、s The ends of the cables shall be blanked off. A pressure difference, the value of which is indicated in the technical specification is established between the two faces of the fixed connector, for 30 min, in either direction in turn. CEN PREN*2591 (PART*C12) 92 3404589 002b895 5 prEN 2591 -CI 2 Pag
15、e 5 tr- Measure the leakage rate. Note : it shall be ensured that any possible leakages at the mounting of the fixed connector are not taken into account in the measurement. 5.2.2 Method B - Leakage across and at the coupling of plugs and protective covers. The ends of the cables shall be blanked of
16、f The plug or protective cover shall be locked onto the fixed connector from which one central contact has been removed. A pressure difference, the value of which is indicated in the technical specification is established for 30 min between the two faces of the connector mounting panel, in either di
17、rection in turn. Measure the leakage rate. Note : it shall be ensured that any possible leakages at the mounting of the fixed connector are not taken into account in the measurement. . 5.2.3 Method C - Leakage of the mounting for fixed connectors Precautions shall be taken so as to test only the dev
18、ice for sealing the mounting of the connector on test. A pressure difference, the value of which is indicated in the technical specification shall be established for 30 min between the two faces of the connector mounting panel, in either direction in turn. Measure the leakage rate. 5.3 Requirement The leakage rate measured shall not exceed the value stipulated in the technical c specification.
