ISA 60079-29-1-2013 Explosive Atmospheres C Part 29-1 Gas detectors C Performance requirements of detectors for flammable gases (12 13 01 Second Printing March 12 2014).pdf
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1、 AMERICAN NATIONAL STANDARD ANSI/ISA-60079-29-1 (12.13.01)-2013 Explosive Atmospheres Part 29-1: Gas detectors Performance requirements of detectors for flammable gases Approved 26 June 2013 Second Printing 12 March 2014 ANSI/ISA-60079-29-1 (12.13.01)-2013, Explosive Atmospheres Part 29-1: Gas detec
2、tors Performance requirements of detectors for flammable gases ISBN: 978-0-876640-27-2 Copyright 2013 by the IEC and ISA. All rights reserved. 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 in any f
3、orm 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-60079-29-1 (12.13.01)-2013 Preface This ISA standard is based
4、on the 1st edition of IEC Publication 60079-29-1. It is the intention of the ISA12 Committee to develop an ANSI Standard that is harmonized with IEC 60079-29-1 to the fullest extent possible. The current edition standard ANSI/ISA-60079-29-1 (12.13.01)-2013 succeeds ANSI/ISA-12.13.01-2002 (IEC 61779-
5、1 through 5 Mod) allowing for the use of the current edition or one previous edition to be valid for approval agency accreditation and product re-certification. This preface is included for informational purposes and is not part of ANSI/ISA-60079-29-1. The document is a modification of the IEC docum
6、ent and includes U.S. National Differences encompassing both additions and deletions of information. National Differences are presented using legislative text (strike-out and underline). The first edition of IEC 60079-29-1 cancels and replaces the first edition of IEC 61779-1 to IEC 61779-5:1998 ser
7、ies and constitutes a technical revision. The main changes with respect to the previous edition are listed below: Subclause 4.2.3 (Alarm or output functions) was modified to ensure alarm devices can not be adjustable outside their measuring range and to include requirements for de-activation of alar
8、m devices. Subclause 4.2.7 (Stand-alone gas detection apparatus for use with separate control units) was added to allow separate evaluation of detection apparatus providing an industry recognized output signal. Subclause 4.2.8 (Separate control units for use with stand-alone gas detection apparatus)
9、 was added to allow separate evaluation of control unit apparatus using an industry recognized input signal. Subclause 4.2.9 (Software-controlled apparatus) was added to the document for improved evaluation of software. The added text is based upon the guiding principles and requirements of EN 50271
10、. Subclause 4.5 (Diffusion Sensors) was removed from the document based upon the redundant protection allowance for equipment used in Zone 0 areas, such as Ex d ia rated equipment. Subclause 5.2.1.1 was modified to require the center wavelength of the optical filters of two apparatus at the minimum
11、and maximum limit of this standard. Subclause 5.2.1.2 was modified to allow the order of testing within each block to be conducted at the discretion of the test laboratory. Subclause 5.3.11 (Communications options) was added to ensure maximum transaction rates are applied during testing. Subclause 5
12、.3.12 (Gas detection apparatus as part of systems) was added to ensure maximum transaction rates are applied during testing. Subclause 5.4.6 (Alarm set point(s) was modified to include text related to alarms that are activated at decreasing concentrations. Subclause 5.4.10 (Air velocity) was modifie
13、d to include testing at 3 m/s and 6 m/s. Subclause 5.4.16 (Time of response) was modified to exclude recovery time test requirements for Group II apparatus with a volume fraction up to 100 % LFL indication. Subclause 5.4.18 (High gas concentration operation above the measuring range) was modified to
14、 define the sequence of tests. Annex A (Performance requirements) has undergone major modifications by eliminating the gas/vapour table and replacing the annex with the performance requirements of Parts 2 to 5 of the former edition. Additionally, performance requirements of Parts 2 to 5 were adjuste
15、d for consistency as appropriate. The intent of this change is to condense Parts 1 to 5 within a single standard. ANSI/ISA-60079-29-1 (12.13.01)-2013 - 4 - This preface, as well as all footnotes and Annex B, is included for information purposes and is not part of ANSI/ISA-60079-29-1 (12.13.01)-2013.
16、 This document has been prepared as part of the service of the International Society of Automation (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. Towa rd this end, the Society welcom
17、es 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: standardsisa.org. The ISA Standards and Practices Departme
18、nt is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in par ticular, in the preparation of instrumentation standards. The Department is further aware of the benefits to USA users of ISA standards of incorporating suitable
19、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
20、possible. American National Standard for Metric Practice, published by the American Society for Testing 0 C to 40 C at 10 % accuracy and 40 C to 60 C at 15 % (manufacturers claimed accuracy). The additional tests should be agreed between the manufacturer and test laboratory and identified and descri
21、bed in the test report. This standard is applicable to flammable gas detection apparatus intended to provide an indication, alarm or other output function; the purpose of which is to give a warning of a potential explosion hazard and in some cases, to initiate automatic or manual protective action(s
22、). This standard is applicable to apparatus, including the integral sampling systems of aspirated apparatus, intended to be used for commercial, industrial and non-residential safety applications. This standard does not apply to external sampling systems, or to apparatus of laboratory or scientific
23、type, or to apparatus used only for process control purposes. It also does not apply to open path (line of sight) area monitors. For apparatus used for sensing the presence of multiple gases, this standard applies only to the detection of flammable gas or vapour. This standard supplements and modifi
24、es the general requirements for the type of protection covered in appropriate ANSI standards of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of the type of protection covered in appropriate ANSI standards IEC 60079-0, the requirement of IEC ANSI/ISA-60079-29-1 will
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