- 3 - ANSI/ISA-95.00.03-2005
PREFACE
This preface, as well as all footnotes and annexes, is included for information purposes and is not part of
ANSI/ISA-95.00.03-2005.
The standards referenced within this document may contain provisions which, through reference in this
text, constitute requirements of this document. At the time of publication, the editions indicated were
valid. All standards are subject to revision, and parties to agreements based on this document are
encouraged to investigate the possibility of applying the most recent editions of the standards indicated
within this document. Members of IEC and ISO maintain registers of currently valid International
Standards. ANSI maintains registers of currently valid U.S. National Standards.
This document has been prepared as part of the service of ISA–The Instrumentation, Systems, and
Automation Society, toward a goal of uniformity in the field of instrumentation. To be of real value, this
document should not be static but should be subject to periodic review. Toward this end, the Society
welcomes all comments and criticisms 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 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 is further aware of the benefits to USA users of ISA
standards of incorporating suitable references to the SI (and the metric system) in their business and
professional dealings with other countries. Toward this end, this 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, 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 ISA standards, 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 TO PATENTS. IF ISA IS INFORMED OF AN EXISTING PATENT THAT IS
REQUIRED FOR USE OF THE STANDARD, IT WILL REQUIRE THE OWNER OF THE PATENT TO
EITHER GRANT A ROYALTY-FREE LICENSE FOR USE OF THE PATENT BY USERS COMPLYING
WITH THE STANDARD OR A LICENSE ON REASONABLE TERMS AND CONDITIONS THAT ARE
FREE FROM UNFAIR DISCRIMINATION.
EVEN IF ISA IS UNAWARE OF ANY PATENT COVERING THIS STANDARD, THE USER IS
CAUTIONED THAT IMPLEMENTATION OF THE 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
THE STANDARD. ISA IS NOT RESPONSIBLE FOR IDENTIFYING ALL PATENTS THAT MAY
REQUIRE A LICENSE BEFORE IMPLEMENTATION OF THE STANDARD OR FOR INVESTIGATING
THE VALIDITY OR SCOPE OF ANY PATENTS BROUGHT TO ITS ATTENTION. THE USER SHOULD
CAREFULLY INVESTIGATE RELEVANT PATENTS BEFORE USING THE STANDARD FOR THE
USER’S INTENDED APPLICATION.
HOWEVER, ISA ASKS THAT ANYONE REVIEWING THIS STANDARD WHO IS AWARE OF ANY
PATENTS THAT MAY IMPACT IMPLEMENTATION OF THE STANDARD NOTIFY THE ISA
STANDARDS AND PRACTICES DEPARTMENT OF THE PATENT AND ITS OWNER.
Copyright 2005 ISA. All rights reserved.
Copyright The Instrumentation, Systems, and Automation Society
Reproduced by IHS under license with ISA
No reproduction or networking permitted without license from IHS
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