SIST EN ISO 8031:2000
(Main)Rubber and plastics hoses and hose assemblies - Determination of electrical resistance (ISO 8031:1993)
Rubber and plastics hoses and hose assemblies - Determination of electrical resistance (ISO 8031:1993)
Gummi- und Kunststoffschläuche und -schlauchleitungen - Bestimmung des elektrischen Widerstandes (ISO 8031:1993)
DIese Internationale Norm legt Verfahren zur elektrischen Prüfung von Gummi- und Kunststoffschläuchen und -schlauchleitungen fest, um den Widerstand von leitfähigen, antistaischen und nicht leitfähigen Schläuchen, die elektrische Verbindung zwischen montierten Armaturen und die elektrische Unterbrechung zu bestimmen.
Tuyaux et flexibles en caoutchouc et en plastique - Détermination de la résistance électrique (ISO 8031:1993)
Gumene in polimerne cevi ter cevni priključki - Ugotavljanje električne upornosti (ISO 8031:1993)
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gummi- und Kunststoffschläuche und -schlauchleitungen - Bestimmung des elektrischen Widerstandes (ISO 8031:1993)Tuyaux et flexibles en caoutchouc et en plastique - Détermination de la résistance électrique (ISO 8031:1993)Rubber and plastics hoses and hose assemblies - Determination of electrical resistance (ISO 8031:1993)23.040.70Gumene cevi in armatureHoses and hose assembliesICS:Ta slovenski standard je istoveten z:EN ISO 8031:1997SIST EN ISO 8031:2000en01-december-2000SIST EN ISO 8031:2000SLOVENSKI
STANDARD
SIST EN ISO 8031:2000
SIST EN ISO 8031:2000
SIST EN ISO 8031:2000
INTERNATIONAL STANDARD ISO 8031 Second edition 1993-12-15 Rubber and plastics hoses and hose assemblies - Determinaticin of electrical resistance Tuyaux et flexibles en caoutchouc et en plastique - Determination de Ia rdsistance electrique Reference number ISO 8031 :1993(E) SIST EN ISO 8031:2000
ISO 8031:1993(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 8031 was prepared by Technical Committee lSO/TC 45, Rubber and rubber products, Subcommittee SC 1, Hoses (rubber and plastics). This second edition cancels and replaces the first edition (ISO 8031:1987), of which it constitutes a minor revision. 0 ISO 1993 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without Permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN ISO 8031:2000
INTERNATIONAL STANDARD 0 ISO ISO 8031:1993(E) Rubber and plastics hoses and hose assemblies - Determination of electrical resistance 1 Scope This Internation,al Standard specifies methods for electrical tests on rubber and plastics hoses and hose assemblies to determine the resistance of conductive, antistatic and nonconductive hoses, the electrical continuity between fittings, and the electrical discon- tinuity. conducting rubber compounds throughout. A method of test is specified for each of the three possible types of construction. 3.1 Apparatus The following apparatus is required and shall be basi- cally as described in ISO 2878. 2 Normative references 3.1 .l Testing instruments The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publica- tion, the editions indicated were valid. All Standards are subject to revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the Standards indicated below. Members of IEC and ISO maintain registers of cur- rently valid International Standards. ISO 291 :1977, Plastics - Standard atmospheres for conditioning and testing. ISO 471: -l)r Rubber - Times, temperatures and hu- midities for conditioning and testing. ISO 287811987, Rubber, vulcanized - Antistatic and conductive products - Determination o f electrical re- sistance. 3 Measurement of resistance of conductive, antistatic and non-conductive hoses Rubber hoses may have a conducting lining only or a conducting cover only, or may be manufactured from 3.1.1.1 To determine the ‘resistance of conductive, antistatic and non-conductive hose, the test should be made preferably with an instrument specifically designed for measuritig insulation resistance, having a nominal open-circuit voltage of 500 V d.c., or with any other instrument known to give co’mparable re- sults. The instrument shall be sufficiently accurate to determine the resistance to within + 10 %. 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 dissipated shall be deter- mined by the Square of the open-circuit voltage div- ided by the measured resistance. The resistance values obtained will vary with the ap- plied 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 less than 40 V, except where this conflicts with the requirement not to dissipate’ more than 3 W in the test piece. 3.1.1.2 For tests requiring measurement of electrical continuity between end fittings or through continuous internal or external bonded wires, the instrument used shall be an Ohmmeter sufficiently accurate to determine the resistance to within + 10 %. 1,) To published. (Revision of ISO 471:1983 and ISO 1826:1981) SIST EN ISO 8031:2000
ISO 8031:1993(E) 0 ISO 3.1.2 Electrodes and contacts 3.3 Conditioning Electrodes shall be formed on the surface as bands (25 $) 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 con- tact area shall be completely wetted and shall remain so until the end of the test. The conductive liquid shall consist of - anhydrous polyethylene glycol of relative molecu- lar mass 600: 800 Parts by mass - water: 200 Parts by mass - wetting agent: 1 patt by mass - potassium chloride: 10 Parts by mass 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 i2. Clean metal contacts shall be applied to the elec- trodes so that the contact area is approximately 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 greater than the hose internal diameter, coated with conducting liquid, and then pushed 25 mm into the hose. The articles shall be conditioned for at least 16 h un- der one of the following Standard conditions ,in ac- cordante with ISO 291 or ISO 471: 23 “C + 2 “C and (50 & 5) % relative humidity 27 “C rl: 2 “C and (65 $- 5) % relative humidity. However, where very long lengths of hose are being tested, it is permissible, by agreement betwe
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