Measurement and control basics

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Measurement and Control Basics, 3rd Edition
Thomas A. Hughes

• • • • •

Process Control and Process Control Loops Fundamentals Temperature and Pressure Measurement Level Measurement and Control Analytical and Flow Measurement

Taken from Measurement and Control Basics, Third Edition

Notice The information presented in this publication is for the general education of the reader.Because neither the authors nor the publisher have any control over the use of the information by the reader, both the authors and the publisher disclaim any and all liability of any kind arising out of such use. The reader is expected to exercise sound professional judgment in using any of the information presented in a particular application. Additionally, neither the authors nor the publisher haveinvestigated or considered the effect of any patents on the ability of the reader to use any of the information in a particular application. The reader is responsible for reviewing any possible patents that may affect any particular use of the information presented. Any references to commercial products in the work are cited as examples only. Neither the authors nor the publisher endorse anyreferenced commercial product. Any trademarks or tradenames referenced belong to the respective owner of the mark or name. Neither the authors nor the publisher make any representation regarding the availability of any referenced commercial product at any time. The manufacturer’s instructions on use of any commercial product must be followed at all times, even if in conflict with the information in thispublication.

Copyright © 2002 ISA – The Instrumentation, Systems, and Automation Society All rights reserved. Printed in the United States of America. 10 9 8 7 6 5 4 3 2 ISBN 1-55617-764-X No part of this work may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior writtenpermission of the publisher. ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, NC 27709

Library of Congress Cataloging-in-Publication Data Hughes, Thomas A. Measurement and control basics / Thomas A. Hughes.-- 3rd ed. p. cm. -- (Resources for measurement and control series) Includes bibliographical references and index. ISBN 1-55617-764-X 1. Process control--Instruments. 2. Measuringinstruments. I. Title. II. Series. TS156.8 .H78 2001 670.42'7--dc21 2001006083

Editor’s Introduction
This “mini-book” is available both in downloadable form, as part of the ISA Press Digital Book Library, and bound in a print format. “Mini-books” are small, unified volumes, from 25 to 100 pages long, drawn from the ISA catalog of reference and technical books. ISA makes mini-books available toreaders who need narrowly focused information on particular subjects rather than a broad-ranging text that provides an overview of the entire subject. Each provides the most recent version of the material—in some cases including revisions that have not yet been incorporated in the larger parent volume. Each has been re-indexed and renumbered so it can be used independently of the parent volume.Other mini-books on related subjects are available. The material in this mini-book was drawn from the following ISA titles: • Measurement and Control Basics, 3rd Edition, by Thomas A. Hughes. Order Number: 1-55617-764-X

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ISA Resources for Measurement and Control Series (RMC)
• • • • • • Measurement andControl Basics, 3rd Edition (2002) Industrial Level, Pressure, and Density Measurement (1995) Industrial Flow Measurement (1990) Programmable Controllers, 3rd Edition (2001) Control Systems Documentation: Applying Symbols and Identification (1993) Industrial Data Communications: Fundamentals and Applications, 3rd Edition (2002) • Real-Time Control Networks (1993) • Automation Systems for...
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