1、 AMERICAN NATIONAL STANDARD ANSI/ISA-61241-11 (12.10.04)-2006 (R2011) Electrical Apparatus for Use in Zone 20, Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Intrinsic Safety “iD” Approved 29 March 2011 ANSI/ISA-61241-11 (12.10.04)-2006 (R2011), Electrical Apparatus for Use in Zo
2、ne 20, Zone 21 and Zone 22 Hazardous (Classified) Locations Protection by Intrinsic Safety “iD” ISBN: 978-1-936007-90-5 Copyright 2011 by IEC and ISA. Not for resale. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval system, or transmitted
3、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 - 3 - ANSI/ISA-61241-11 (12.10.04)-2006 (R2011) Preface This preface,
4、as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-61241-11 (12.10.04)-2006 (R2011). This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document shoul
5、d 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
6、-8411; Fax (919) 549-8288; E-mail: standardsisa.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 Departme
7、nt 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
8、 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 the underlining has been omitted for clarity. Clause Differences t
9、o IEC 61241-11:2005 1 A title has been added to the list of specific clauses of ANSI/ISA-61241-0 excluded by this standard. The table has been modified to align with ANSI/ISA-61241-0. 5 The term “categories” has been replaced by “levels of protection”. 5 Requirements for levels of protection “iaD” a
10、nd “ibD” have been added. 6.2 Requirements for the temperatures of apparatus not immersed in dust have been added and the temperature requirements for apparatus immersed in dust clarified. 6.2 Temperature requirements for potentiometers have been deleted as these are already in the referenced ANSI/I
11、SA-60079-11. 6.2.3 A “Standardized dust immersion temperature test” has been added. 6.2.4 Subclause 6.2.4 deleted as it is already addressed by the general requirement of 6.2.1 6.2.5 Subclause 6.2.5 deleted as it is already addressed by the general requirement of 6.2.1 6.7 The clause title has been
12、altered to reflect the subject matter of this standard. 10.1 An exemption to allow intrinsically safe circuits to be deduced from the data in Annex A of ANSI/ISA-60079-11 has been added. 10.4 Subclause 10.4 deleted as the small component ignition is a characteristic applied to gases and vapors but n
13、ot dusts. 10.7.1 Impact test requirements have been modified to align with the referenced ANSI/ISA-60079-0. 12.3 Requirement for a Control Drawing and a control drawing reference to be marked on the apparatus have been added. Annex Titles have been added to Annexes A, B and C. This page intentionall
14、y left blank. Developing and promulgating sound consensus standards, recommended practices, and technical reports is one of ISAs primary goals. To achieve this goal the Standards and Practices Department relies on the technical expertise and efforts of volunteer committee members, chairmen and revie
15、wers. ISA is an American National Standards Institute (ANSI) accredited organization. ISA administers United States Technical Advisory Groups (USTAGs) and provides secretariat support for International Electrotechnical 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: ISA Attn: Standards Department 67 Alexander Drive P.O. Box 12277 Research Triangle Park, NC 27709 ISBN: 978-1-936007-90-5
