ISO/TS TECHNICAL SPECIFICATION 15768 First edition 2000-07-01 Measurement of liquid velocity in open channels Design, selection and use of electromagnetic current meters Mesurage de la vitesse des liquides dans les canaux découverts- Reference number ISO/TS 15768:2000(E) ISO @ ISO 2000 y IHS under lic ted without license from IHS Not for Resale ISO/TS 15768:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. Adobe is a trademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event ?ISO2000 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 either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.ch Printed in Switzerland @ISo2000-All rightsreserved ed without license from IHS Not for Resale ISO/TS 15768:2000(E) Contents Page Foreword. iv Introduction Scope 2 Normative reference. 3 Terms and definitions 4 Units of measurement.. 5 Physical characteristics of the electromagnetic current meter.. 5.1 General.... 5.2 Sensing head.. 5.3 Means of suspension.. 5.4 Control unit. 5.5 Signal cable. 5.6 Energy source 6 Use of electromagnetic current meters. 6.1 General..... 6.2 Measurement procedures using electromagnetic current meters 6.3 Use of an electromagnetic current meter in preference to a rotating element meter 6.4 Practical aspects of using an electromagnetic current meter to determine flow in open channels using the velocity area method . 6.5 Selection, care and maintenance of electromagnetic current meters Bibliography ii by IHS under lic nse from IHS Not for Resale ISO/TS 15768:2000(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas 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 with the rules given in the ISO/IEc Directives, Part 3. 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 In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish other types of normative document: parent committee casting a vote; an IsO Technical Specification (ISsO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed every three years with a view to deciding whether it can be transformed into an International Standard. Attention is drawn to the possibility that some of the elements of this Technical Specification ISO/TS 15768 may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO/TS 15768 was prepared by Technical Committee ISO/TC 113, Hydrometric determinations, Subc