Instrumentacion

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AMERICAN NATIONAL STANDARD

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

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Copyright International Society of Automation
Provided by IHS under license with ISA
No reproduction or networking permitted without license from IHS

Not for ResaleANSI/ISA-5.1-2009, Instrumentation Symbols and Identification
ISBN: 978-1-936007-29-5

ISA
67 Alexander Drive
P. O. Box 12277
Research Triangle Park, North Carolina, 27709 USA

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Copyright © 2009 by ISA. All rights reserved. Not for resale. Printed in the United States of America.
No part of thispublication 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.

Copyright International Society of Automation
Provided by IHS under license with ISA
No reproduction or networking permitted without license from IHS

Not for Resale-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.

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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 continuingvalue, 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: (919) 549-8411; Fax:
(919) 549-8288, e-mail: standards@isa.org.
The ISA Standards and PracticesDepartment 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 ofthe 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, abbreviations, and conversion factors.
It is the policy of ISA to encourage and welcome the participation of all concerned individuals and
interests in the development of ISAstandards, recommended practices, and technical reports.
Participation in the ISA standards-making process by an individual in no way constitutes endorsement by
the employer of that individual, of ISA, or of any of the standards, recommended practices, and technical
reports that ISA develops.
CAUTION — ISA ADHERES TO THE POLICY OF THE AMERICAN NATIONAL STANDARDS
INSTITUTE WITH REGARD TOPATENTS. IF ISA IS INFORMED OF AN EXISTING PATENT THAT IS
REQUIRED FOR USE OF THIS STANDARD, IT WILL REQUIRE THE OWNER OF THE PATENT TO
GRANT EITHER A ROYALTY-FREE LICENSE FOR USE OF THE PATENT BY USERS COMPLYING
WITH THIS STANDARD OR A LICENSE ON REASONABLE TERMS AND CONDITIONS THAT ARE
FREE FROM UNFAIR DISCRIMINATION.

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EVEN IF ISA IS UNAWARE OF ANY PATENTCOVERING THIS STANDARD, THE USER IS
CAUTIONED THAT IMPLEMENTATION OF THIS STANDARD MAY REQUIRE USE OF TECHNIQUES,
PROCESSES, OR MATERIALS COVERED BY PATENT RIGHTS. ISA TAKES NO POSITION ON THE
EXISTENCE OR VALIDITY OF ANY PATENT RIGHTS THAT MAY BE INVOLVED IN IMPLEMENTING
THIS STANDARD. ISA IS NOT RESPONSIBLE FOR IDENTIFYING ALL PATENTS THAT MAY
REQUIRE A LICENSE BEFORE IMPLEMENTATION OF...