ISO INTERNATIONAL STANDARD 6297 Second edition 1997-12-01 Petroleum products Aviation and distillate fuels -- Determination of electrical conductivity Produitspetroliers- CarburantsaviationetdistillatsDetermination delaconductivite électrique ISO Reference number ISO 6297:1997(E) py IHS under lic itted without license from IHS Not for Resale ISO 6297:1997(E) Foreword federation 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 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. 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 6297 was prepared by Technical Committee ISO/TC 28, Petroleum products and lubricants. This second edition cancels and replaces the first edition (IsO 6297:1983), which has been technically revised. Annex A of this International Standard is for information only. @ISO1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International OrganizationforStandardization Case postale 56 : CH-1211 Geneve 20 · Switzerland Internet [email protected] X.400 C=ch; a=400net; p=iso; o=isocs; S=central Printed in Switzerland ii maiagazainSadardizatio Not for Resale INTERNATIONAL STANDARD ISO ISO 6297:1997(E) Petroleum products - Aviation and distillate fuels -- Determination of electrical conductivity WARNING - The use of this International Standard may involve hazardous materials, operations and equipment. This International Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this International Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Scope 1 This International Standard specifies a method for the determination of the electrical rest conductivity of aviation and distillate fuels with or without a static dissipator additive. The method measures conductivity when the fuel is uncharged, i.e. electrically at rest (known as rest conductivity). Two methods are available for fuel conductivity measurement, either using a portable meter for the direct measurement in tanks or laboratory and field measurement of samples, or using an in-line meter for continuous measurement of fuel conductivities (equivalent to rest conductivity) in a flowing stream. When using either type of instrument care should be taken in allowing the relaxation of residual electrical charges before measurement and in preventing contamination. The procedure can be used to measure conductivities from 1 pS/m to 2 0o0 pS/m using the equipment used to establish the reported precision. The range can be extended to greater than 2 oo0 pS/m with the correct selection of electrode size and current measuring apparatus. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, 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 recent edition of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IS