1、Recommendations for thePreparation, Content, andOrganization of Intrinsic SafetyControl DrawingsApproved 15 May 1996ISARP12.2.021996RECOMMENDED PRACTICEISA The Instrumentation,Systems, andAutomation Society TMCopyright 1996 by the Instrument Society of America. All rights reserved. Printed in the Un
2、itedStates of America. No part of this publication may be reproduced, stored in a retrieval system, ortransmitted in any form or by any means (electronic, mechanical, photocopying, recording, orotherwise), without the prior written permission of the publisher.ISA67 Alexander DriveP.O. Box 12277Resea
3、rch Triangle Park, North Carolina 27709ISARP12.2.021996, Recommendations for the Preparation, Content, and Organization of Intrinsic Safety Control DrawingsISBN: 1-55617-605-8ISA-RP12.2.02-1996 3PrefaceThis preface, as well as all annexes and footnotes, is included for informational purposes and is
4、not part of ISA-RP12.2.02-1996.This recommended practice has been prepared as part of the service of ISA, the international society for measurement and control, 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
5、 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: st
6、andardsisa.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, recommended practices, and technical reports. The
7、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
8、 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. 268-1992, and future revisions, will be the reference guide for definitions, symbols, abbreviations, and conv
9、ersion 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, o
10、f ISA, or of any of the standards, recommended practices, and technical reports that ISA develops.The following members of ISA SP12.2 contributed to the development of this document:NAME COMPANYA. Engler, Chairman Applied Automation, Inc.D. Bishop, Managing Director Chevron USA Production Company*N.
11、 Abbatiello Eastman Kodak CompanyR. Amin Dow Corning, Inc.P. Austen Electronic Controls Design, Inc.P. Babiarz Crouse-Hinds CompanyW. Calder III Calder EnterprisesR. Cardinal Bentley Nevada CorporationM. Coppler Bacharach Instruments, Inc.U. Dugar Mobil Chemical CompanyT. Feindel R. Stahl, Inc.W. Fi
12、ske Inchcape Testing ServicesS. Florence Motorola, Inc.*One vote per company4 ISA-RP12.2.02-1996NAME COMPANYD. Hohenstein Pepperl + FuchsS. Jackson Elcon Instruments, Inc.*P. Kelly Underwriters Laboratories, Inc.B. Larson Turck, Inc.D. Li Canadian Standards AssociationE. Magison Honeywell, Inc.D. Ma
13、rtell Dastech, Inc.R. Masek Bailey Controls CompanyF. McGowan Factory Mutual Research CorporationJ. Miller Detector Electronics Corporation*A. Mobley 3M Company*S. Norako Crouse-Hinds Company*E. Olson 3M CompanyC. Oudar MTL, Inc.A. Page III MSHA Certification CenterM. Rains Foxboro CompanyR. Ring Mi
14、ne Safety Appliances CompanyP. Schimmoeller Weidmuller, Inc.T. Schnaare Rosemount, Inc.*D. Styrcula Underwriters Laboratories, Inc.L. Truscott Motorola, Inc.D. Wechsler Union Carbide Corporation*R. Weinzler Eastman Kodak CompanyThe following members of ISA Committee SP12 contributed to the developme
15、nt of this document:NAME COMPANY*F. McGowan, Chairman Factory Mutual Research CorporationD. Bishop, Managing Director Chevron USA Production Company*N. Abbatiello Eastman Kodak Company*W. Alexander Mine Safety Appliances CompanyS. Arnold Drexelbrook Engineering Company*P. Babiarz Crouse-Hinds Compan
16、y*A. Ballard Crouse-Hinds CompanyG. Bentinck Du Pont Engineering*R. Berthold Chevron USA Production CompanyH. Bockle Killark-Stahl, Inc.J. Bossert Hazloc, Inc.R. Brodin Fisher Controls International, Inc.M. Buettner Ralston Purina CompanyR. Buschart PC however, information showing the operation of t
17、he apparatus can be very useful to the system designer.5.2 Equipment identificationThe following minimum information should be provided:5.2.1 Control drawings provided by the manufacturers of intrinsically safe apparatus (as shown in Figure 1) should identify the model number(s) and entity parameter
18、s of the intrinsically safe apparatus, and should specify the entity parameters for acceptable associated apparatus.5.2.2 Control drawings provided by the manufacturers of associated apparatus (as shown in Figure 2) should identify the model number(s) and entity parameters of the associated apparatu
19、s, 12 ISA-RP12.2.02-1996and should specify the entity parameters for acceptable intrinsically safe apparatus, or specify connection to simple apparatus.5.2.3 Control drawings that specify the entire intrinsically safe system (as shown in Figure 3) should identify the model number(s) of both the asso
20、ciated apparatus and the intrinsically safe apparatus, and should specify the interconnection of the intrinsically safe apparatus and associated apparatus. Control drawings of this type may be provided by either the manufacturer of the associated apparatus or the manufacturer of the intrinsically sa
21、fe apparatus.5.3 Entity parametersWhen entity parameters are provided, they should be supplied in a table or other suitable form, showing allowable values for each applicable class and group. When multi-channel associated apparatus is involved, the terminals to which the entity parameters apply shou
22、ld be clearly identified. It may be necessary to have more than one set of parameters for multiple terminals.It is possible to have both system configuration and entity configuration shown on the same control drawing. In such cases, it is possible for the identified associated apparatus to have enti
23、ty parameters that exceed the allowed entity parameters for the intrinsically safe apparatus. Evaluation using the entity concept results in the application of more than two faults. When equipment is evaluated as a system, only two faults are applied. The entity concept provides a great deal of flex
24、ibility for configuring a system, but at the expense of excluding some equipment that would be acceptable under the system configuration.5.4 Hazardous location identificationThe control drawing should include a demarcation line between the hazardous (classified) and the nonhazardous (unclassified) l
25、ocations, and should identify equipment that may be installed in each location. The hazardous locations should be identified by class, group(s), and division(s).5.5 Control drawing identificationThe control drawing should be identified by manufacturer, identification number, sheet or page number of
26、total, and some form of revision control (e.g., date or revision level).5.6 Maximum voltageControl drawings for associated apparatus should show the maximum nonhazardous location voltage that may be used with the associated apparatus.5.7 Installation informationThe control drawing should contain a r
27、eference to ANSI/ISA-RP12.6, and a reference to the National Electrical Code, NFPA 70 Article 504 or CEC Part 1, Appendix F.ISA-RP12.2.02-1996 135.8 Other informationAt the discretion of the manufacturer, other useful information may be provided on the control drawing to further aid proper installat
28、ion.Figure 1 Intrinsically safe apparatus for connection to associated apparatus specified by entity parameters14 ISA-RP12.2.02-1996Figure 2 Associated apparatus identified by manufacturer and model number for connection to intrinsically safe apparatus specified by entity parametersISA-RP12.2.02-199
29、6 15Figure 3 Intrinsically safe apparatus and associated apparatus specified by manufacturer and model numberDeveloping and promulgating technically sound consensus standards and recommended practices is one of ISAs primary goals. To achieve this goal the Standards and Practices Department relies on
30、 the technical expertise and efforts of volunteer committee members, chairmen, and reviewers.ISA is an American National Standards Institute (ANSI) accredited organization. ISA administers United States Technical Advisory Groups (USTAGs) and provides secretariat support for International Electrotech
31、nical Commission (IEC) and International Organization for Standardization (ISO) committees that develop process measurement and control standards. To obtain additional information on the Societys standards program, please write:ISAAttn: Standards Department67 Alexander DriveP.O. Box 12277Research Triangle Park, NC 27709ISBN: 1-55617-605-8
