Sr. marcelo

AMERICAN NATIONAL STANDARD

ANSI/ISA-5.1-2009 Instrumentation Symbols and Identification
Approved 18 September 2009

ANSI/ISA-5.1-2009, Instrumentation Symbols and Identification ISBN: 978-1-936007-29-5 Copyright © 2009 by ISA. All rights reserved. Not for resale. Printed in the United States of America. No part of this publication 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 written permission of the Publisher. ISA 67 Alexander Drive P. O. Box 12277 Research Triangle Park, North Carolina, 27709 USA

-3-

ANSI/ISA-5.1-2009

Preface (informative)
This preface is included for information purposes and is not part of ANSI/ISA-5.1-2009. This standard has been prepared as part of the service of ISA, The International Society of Automation, toward the goal of uniformity in the field of industrial automation. To be of continuing value, this standard should not be static but should be subject to periodic review. ISA welcomes all comments and suggestions and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone: [phone]; Fax: [phone], e-mail: [e-mail]. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The Department will endeavor to introduce SI-acceptable metric units in all new and revised standards, recommended practices, and technical reports to the greatest extent possible. Standard for Use of the International System of Units (SI): The Modern Metric System, published by the American Society for Testing & Materials as IEEE/ASTM SI 10-97, and future revisions, will be the reference guide for definitions, symbols,