AMERICAN NATIONAL STANDARD
Approved 18 September 2009
ANSI/ISA-5.1-2009, Instrumentation Symbols and Identification
Copyright © 2009 by ISA. All rights reserved. Not for resale. Printed in the United States of America.
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This preface is included for information purposes and is not part of ANSI/ISA-5.1-2009.
This standardhas 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; 67Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone: (919) 549-8411; Fax:
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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 willendeavor 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, abbreviations, and conversion factors.
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