1、BS EN ISO8031:2009ICS 23.040.70NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDRubber and plasticshoses and hoseassemblies Determination ofelectrical resistanceand conductivity (ISO8031:2009)This British Standardwas published underthe authority of theStandards P
2、olicy andStrategy Committee on 30November 2009 BSI 2009ISBN 978 0 580 57421 4Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 8031:2009National forewordThis British Standard is the UK implementation of EN ISO 8031:2009. Itsupersedes BS EN ISO 8031:1997 which is withdrawn.The UK p
3、articipation in its preparation was entrusted to TechnicalCommittee PRI/66/-/4, Methods of test.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsib
4、le for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8031 October 2009 ICS 23.040.70 Supersedes EN ISO 8031:1997English Version Rubber and plastics hoses and hose assemblies - Determina
5、tion of electrical resistance and conductivity (ISO 8031:2009) Tuyaux et flexibles en caoutchouc et en plastique - Dtermination de la rsistance et de la conductivit lectriques (ISO 8031:2009) Gummi- und Kunststoffschluche und Schlauchleitungen - Bestimmung der elektrischen Eigenschaften, des Widerst
6、ands und der Leitfhigkeit (ISO 8031:2009) This European Standard was approved by CEN on 10 October 2009. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration
7、. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translati
8、on under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, G
9、reece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Manag
10、ement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8031:2009: EBS EN ISO 8031:2009EN ISO 8031:2009 (E) 3 Foreword This document (EN ISO 8031:2009) has been prepared by Technical
11、 Committee ISO/TC 45 “Rubber and rubber products“ in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identic
12、al text or by endorsement, at the latest by April 2010, and conflicting national standards shall be withdrawn at the latest by April 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held respon
13、sible for identifying any or all such patent rights. This document supersedes EN ISO 8031:1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
14、Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 8031:2009 ha
15、s been approved by CEN as a EN ISO 8031:2009 without any modification. BS EN ISO 8031:2009ISO 8031:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Measurement of resistance of conductive, antistatic and no
16、n-conductive hoses.1 4.1 General .1 4.2 Apparatus.2 4.3 Preparation and cleaning for the test3 4.4 Conditioning 4 4.5 Procedure for hoses with conducting lining (on full hose length).4 4.6 Procedure for hoses with conducting cover 5 4.7 Procedure for hoses with conducting compounds throughout.6 4.8
17、Hose assemblies fitted with metal end fittings 7 4.9 Test procedure to determine the electrical resistance through the wall of hoses and hose assemblies .7 5 Measurement of electrical continuity between metal end fittings of hose assemblies .10 6 Measurement of electrical discontinuity of hose assem
18、blies 10 7 Measurement of electrical resistance of a hose assembly lining (conductive or static dissipating) or hose assembly cover (conductive or static dissipating) in contact with the metal end fitting.11 7.1 General .11 7.2 Apparatus.11 7.3 Preparation and cleaning for the test11 7.4 Conditionin
19、g 11 7.5 Test procedure.11 8 Test report13 Annex A (informative) Recommended terminology and limits for electrical conductivity and resistance.15 BS EN ISO 8031:2009ISO 8031:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federa
20、tion of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committ
21、ee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance
22、 with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires ap
23、proval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8031 was prepared by Technical Commi
24、ttee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1, Hoses (rubber and plastics). This third edition cancels and replaces the second edition (ISO 8031:1993), which has been technically revised (for details, see the Introduction). BS EN ISO 8031:2009ISO 8031:2009(E) ISO 2009 All rights rese
25、rved vIntroduction This edition of ISO 8031 addresses the problems encountered in field testing and during product acceptance tests in a production facility in following the test procedures specified in the previous edition (ISO 8031:1993) and a more practical approach is suggested. Also, a test pro
26、cedure for determining electrical continuity between the end fittings of a hose assembly without actually measuring the resistance has been introduced. This test is frequently carried out in the field and in the factory when the product standard does not require the exact electrical resistance to be
27、 measured, but only requires verification of electric conductivity between both metal end fittings. Special test methods to determine the electrical resistance through the hose wall (now required in some product standards for hoses used in explosive atmospheres) have been added. Some test methods wh
28、ich have been standard practice in the hose industry for some time have now been included, as have several new methods to determine the ability of a hose assembly (with metal end fittings) to dissipate static electric charges when the metal end fitting is connected to earth. A total of four new expl
29、anatory sketches are included. The hose and hose assembly product standard applicable will have to specify which method is most suitable for the purpose of verification of the required property. Annex A, an amended version of informative Annex A, “Recommended terminology and limits for electrical re
30、sistance”, in ISO 8330:2007, has been included. BS EN ISO 8031:2009BS EN ISO 8031:2009INTERNATIONAL STANDARD ISO 8031:2009(E) ISO 2009 All rights reserved 1Rubber and plastics hoses and hose assemblies Determination of electrical resistance and conductivity 1 Scope This International Standard specif
31、ies electrical test methods for rubber and plastics hoses, tubing and hose assemblies to determine the resistance of conductive, antistatic and non-conductive hoses and the electrical continuity or discontinuity between metal end fittings. NOTE All the test methods described for rubber hoses in this
32、 International Standard can also be applied to plastics hoses. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document
33、 (including any amendments) applies. ISO 2878, Rubber Antistatic and conductive products Determination of electrical resistance ISO 8330, Rubber and plastics hoses and hose assemblies Vocabulary ISO 23529, Rubber General procedure for preparing and conditioning test pieces for physical test methods
34、3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8330 apply. 4 Measurement of resistance of conductive, antistatic and non-conductive hoses 4.1 General Rubber hoses may have a conducting lining only or a conducting cover only, or may be manufactured f
35、rom conducting rubber compounds throughout. A method of test is specified for each of the three possible types of construction. BS EN ISO 8031:2009ISO 8031:2009(E) 2 ISO 2009 All rights reserved4.2 Apparatus The following apparatus is required and shall be basically as described in ISO 2878. 4.2.1 T
36、est instruments 4.2.1.1 To determine the resistance of conductive, antistatic and non-conductive hose1), the test should preferably be made with an instrument specifically designed for measuring insulation resistance, having a nominal open-circuit voltage of 500 V d.c., or with any other instrument
37、known to give comparable results. The instrument shall be sufficiently accurate to determine the resistance to within 10 % unless specified otherwise. During the test, not more than 3 W shall be dissipated in the specimen, to prevent erroneous results due to effects of temperature. The power dissipa
38、ted shall be determined by the square of the open-circuit voltage divided by the measured resistance. The resistance values obtained will vary with the applied voltage, and errors may occur when low test voltages are involved. In cases of dispute, the voltage applied to the test piece shall be not l
39、ess than 40 V, except where this conflicts with the requirement not to dissipate more than 3 W in the test piece. 4.2.1.2 For tests requiring the measurement of the electrical continuity between end fittings or through continuous internal or external bonded wires, the instrument used shall be an ohm
40、meter sufficiently accurate to determine the resistance to within 10 %. 4.2.1.3 For tests where, according to the product standard, determination of the electrical continuity between the end fittings of a hose assembly is required, without measurement of the actual electrical resistance, a 4,5 V bat
41、tery in combination with a 4 V (0,3 A) test lamp can be used. 4.2.1.4 For determination of the electrical resistance through the hose wall (required by some hose product standards for hoses used in explosive atmospheres), the instrument used shall be an ohmmeter with a capacity of 1012 and the measu
42、rement shall be made at 500 V d.c. The instrument shall be sufficiently accurate to determine the resistance between the lining and the cover as measured through the hose wall to within 5 %. 4.2.2 Electrodes and contacts 4.2.2.1 General For tests conducted in a laboratory, the equipment described be
43、low shall be used. For field tests, and for routine tests and product acceptance tests in a manufacturers plant, this equipment is not practical, and alternatives may be used as described in 4.6.1, 4.7.1.2 and 4.7.2.3. Electrodes shall be formed on the surface as bands ()2125+mm wide around the circ
44、umference by means of a conductive silver lacquer, colloidal graphite or a conductive liquid. When a conductive liquid is used, the electrode contact area shall be completely wetted and shall remain so until the end of the test. Unless otherwise specified, the conductive liquid shall consist of 800
45、parts by mass of anhydrous poly(ethylene glycol) of relative molecular mass 600; 200 parts by mass of water; 1 part by mass of wetting agent; 10 parts by mass of potassium chloride. 1) See ISO 8330 and Annex A of this International Standard for details of construction. BS EN ISO 8031:2009ISO 8031:20
46、09(E) ISO 2009 All rights reserved 3When a conductive silver lacquer or colloidal graphite is used, the surface resistance between any two points on a sample of the dried film shall not exceed 100 . Clean metal contacts shall be applied to the electrodes so that the contact area is approximately the
47、 same size as, but no greater than, the electrodes, except where otherwise stated. In the case of hoses of less than 50 mm bore, it is difficult to apply the conducting liquid accurately to the hose bore, and it is preferable to use a brass plug of external diameter equal to or greater than the hose
48、 internal diameter (ID), coated with conducting liquid and then pushed 25 mm into the hose. 4.2.2.2 Special electrodes and contacts The following special electrodes and contacts shall be used for the determination of the electrical resistance through the hose wall, and other test methods: a) Outer e
49、lectrode: a copper sheet-metal band, of standard width 25 mm, clamped around the outer hose wall (see Figure 1). b) Inner electrode: 1) For hoses of less than 50 mm bore size, it is recommended that a tight-fitting brass plug (solid for small bore sizes and hollow for larger sizes), of minimum length 2 the pitch of the helical wire(s) (for hoses incorporating helical wires) or 0,5 ID (for hoses without helical wires), be used. 2) For hoses of more than 50 mm bore size, it is recommended that an adjustable copper sheet-met
