1、April 2010 Translation by DIN-Sprachendienst.English price group 12No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、23.040.70!$aX-“1625310www.din.deDDIN EN ISO 8031Rubber and plastics hoses and hose assemblies Determination of electrical resistance and conductivity (ISO 8031:2009)English translation of DIN EN ISO 8031:2010-04Gummi- und Kunststoffschluche und Schlauchleitungen Bestimmung des elektrischen Widerstan
3、ds und der elektrischen Leitfhigkeit(ISO 8031:2009)Englische bersetzung von DIN EN ISO 8031:2010-04Tuyaux et flexibles en caoutchouc et en plastique Dtermination de la rsistance et de la conductivit lectriques (ISO 8031:2009)Traduction anglaise de DIN EN ISO 8031:2010-04SupersedesDIN EN ISO 8031:199
4、7-08www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 21 pages04.10 DIN EN ISO 8031:2010-04 2 A comma is used as the decimal marker. National foreword This document has been prepared by Technical Committee ISO/TC 45 “Rubber and rubber pro
5、ducts”, (Secretariat: DSM, Malaysia), Subcommittee SC 1 “Hoses (rubber and plastics)” (Secretariat: DSM, Malaysia), and has been adopted as EN ISO :200 by Technical Committee CEN/TC 218 “Rubber and plastics hoses and hose assemblies” (Secretariat: BSI, United Kingdom). The responsible German body in
6、volved in its preparation was the Normenausschuss Kautschuktechnik (Rubber Technology Standards Committee), Technical Committee NA 045-02-12 AA Schluche. The DIN Standards corresponding to the International Standards referred to in clause 2 of this document are as follows: ISO 8330 DIN EN ISO 8330 I
7、SO 23529 DIN ISO 23529 Amendments This standard differs from DIN EN ISO 8031:1997-08 as follows: a) The standard has been brought in line with the current rules of presentation. b) The standard has been editorially revised. c) The standard has been technically revised. d) Subclause 4.9 “Test procedu
8、re to determine the electrical resistance through the wall of hoses and hose assemblies” has been added. e) Annex A “Recommended terminology and limits for electrical conductivity and resistance” has been added. Previous editions DIN EN 28031: 1993-04 DIN EN ISO 8031: 1997-08 National Annex NA (info
9、rmative) Bibliography DIN EN ISO 8330, Rubber and plastics hoses and hose assemblies Vocabulary DIN ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 8031 9EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8031 October 2009 ICS 23.040.70
10、 Supersedes EN ISO 8031:1997English Version Rubber and plastics hoses and hose assemblies Determination 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
11、Kunststoffschluche und Schlauchleitungen Bestimmung des elektrischen Widerstands und der elektrischen 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 f
12、or 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 CEN Management Centre or to any CEN member. This European Standard exists in three offic
13、ial versions (English, French, German). A version in any other language made by translation 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,
14、 Belgium, Bulgaria, Cyprus, Czech 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 United Kingdom. EUROPEAN COMMITTE
15、E FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management 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: EContents EN ISO 8031:2009
16、 (E) DIN EN ISO 8031:2010-04 2 Page Foreword .3 Introduction.4 1 Scope5 2 Normative references5 3 Terms and definitions .5 4 Measurement of resistance of conductive, antistatic and non-conductive hoses.5 4.1 General .5 4.2 Apparatus.6 4.3 Preparation and cleaning for the test7 4.4 Conditioning 8 4.5
17、 Procedure for hoses with conducting lining (on full hose length) 8 4.6 Procedure for hoses with conducting cover 9 4.7 Procedure for hoses with conducting compounds throughout.10 4.8 Hose assemblies fitted with metal end fittings 11 4.9 Test procedure to determine the electrical resistance through
18、the wall of hoses and hose assemblies .11 5 Measurement of electrical continuity between metal end fittings of hose assemblies .14 6 Measurement of electrical discontinuity of hose assemblies 14 7 Measurement of electrical resistance of a hose assembly lining (conductive or static dissipating) or ho
19、se assembly cover (conductive or static dissipating) in contact with the metal end fitting.15 7.1 General .15 7.2 Apparatus.15 7.3 Preparation and cleaning for the test15 7.4 Conditioning 15 7.5 Test procedure.15 8 Test report17 Annex A (informative) Recommended terminology and limits for electrical
20、 conductivity and resistance.19 Foreword 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 identical text or by endorsement, at the latest by April 2010, and conflicting national standards sh
21、all 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 responsible for identifying any or all such patent rights. This document supersedes EN ISO 8031:199
22、7. 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 Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ital
23、y, 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 has been approved by CEN as a EN ISO 8031:2009 without any modification. rubber products” in co
24、llaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses and This document (EN ISO 8031:2009) has been prepared by Technical Committee ISO/TC 45 “Rubber and EN ISO 8031:2009 (E) DIN EN ISO 8031:2010-04 3 Introduction This edition of ISO 8031 addresses the problems encountered in fi
25、eld 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 procedure for determining electrical continuity between the end fittings of a hose asse
26、mbly 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 measured, but only requires verification of electric conductivity between both meta
27、l 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 which have been standard practice in the hose industry for some time have now been inc
28、luded, 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 explanatory sketches are included. The hose and hose assembly product standard applicabl
29、e 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 resistance”, in ISO 8330:2007, has been included. EN ISO 8031:2009 (E) DIN EN ISO 8031
30、:2010-04 4 1 Scope This International Standard specifies 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 Al
31、l the test methods described for rubber hoses in this 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 refe
32、rences, the latest edition of the referenced document (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 an
33、d conditioning test pieces for physical test methods 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
34、 or a conducting cover only, or may be manufactured from conducting rubber compounds throughout. A method of test is specified for each of the three possible types of construction. EN ISO 8031:2009 (E) DIN EN ISO 8031:2010-04 5 4.2 Apparatus The following apparatus is required and shall be basically
35、 as described in ISO 2878. 4.2.1 Test 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
36、.c., or with any other instrument 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
37、 of temperature. The power dissipated 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 applie
38、d to the test piece shall be not less 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, t
39、he instrument used shall be an ohmmeter 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
40、electrical resistance, a 4,5 V battery 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 wit
41、h a capacity of 1012 and the measurement 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 labo
42、ratory, the equipment described below 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 ba
43、nds ()2125+mm wide around the circumference 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 condu
44、ctive liquid shall consist of 800 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 constructi
45、on. EN ISO 8031:2009 (E) DIN EN ISO 8031:2010-04 6 When 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 ap
46、proximately the 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 greate
47、r than the hose 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 meth
48、ods: a) Outer electrode: 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), o
49、f 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-metal band, tightly fitting the bore of the hose (expanded against the lining by spring action), of minimum width 25 mm, be used. c) Contacts for connecting the electrodes to the ohmmeter should preferably be soldered or brazed to the electrodes to minimize resistance between ohmmeter and e
