ISA-5.5-1985 Graphic Symbols for Process Displays
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ID： |
E8FEB2E0B14047D7A6EFAD2978647179 |
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文件大小(MB)： |
0.4 |
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页数： |
48 |
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文件格式： |
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日期： |
2009-5-22 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
Graphic Symbols for,Process Displays,Approved 3 February 1986,ISA–5.5–1985,Formerly ISA–S5.5–1985,STANDARD,ISA The Instrumentation,Systems, and,Automation Society,–,TM,Copyright ?1985 by the Instrument Society of America. All rights reserved. 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,ISA-5.5-1985, Graphic Symbols for Process Displays,ISBN 0-87664-935-5,ISA-S5.5-1985 3,Preface,This preface is included for informational purposes and is not a part of ISA-5.5-1985.,This Standard has been prepared as a part of the service of ISA 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, North Carolina 27709, Telephone,(919) 549-8411, 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,U.S.A. 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 to the greatest extent possible. The Metric Practice Guide, which has been published,by the Institute of Electrical and Electronics Engineers as ANSI/IEEE Std. 268-1982, 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. Participation in the ISA Standards-making,process by an individual in no way constitutes endorsement by the employer of that individual of,ISA or any of the standards which ISA develops.,The information contained in this preface, in the footnotes, and in the appendices is included for,information only and is not part of the standard.,The original draft of this document resulted from the committee work of the International Purdue,Workshop on Industrial Computer Systems, the Man/ Machine Communication Committee TC-6.,The use of graphic symbols representing entities and characteristics of processes has evolved,rapidly during the course of the last decade. Technology has allowed the presentation of a,physical process to be represented and controlled by the use of computers and advanced,electronic systems. These systems use video-display technologies such as CRTs, plasma,screens, and other media to present to the user a graphic representation of his process. It is,through these devices and the symbology used to represent the process in question that the user,monitors and controls the particular operation.,Process displays convey information to the user in the form of both text and graphic symbols.,Text information is based on the use of numeric data and the alphabet to construct the words,necessary to convey the meaning of the information. This text information is structured around,the use of written language and is highly ordered and understood by users. On the other hand,the use of graphic symbols for process and information presentation is highly dependent upon,the manufacturer and the user of the product. These graphic symbols are generally customized,to the particular application at hand.,Standard graphic symbols provide a more logical and uniformly understandable mechanism for,modern control processes. For example, a control system may be constructed of several control,systems and a central control system. In cases such as this, the operator often finds that he,4 ISA-S5.5-1985,must become familiar with the graphic symbology of several different systems, although they,may represent common elements.,It is the intent of this document that both the manufacturers and users of process displays use,these graphic symbols in their systems whenever applicable. It is recognized that technology is,rapidly changing in the types ……
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