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
25、take precedence. NOTE 1 IEC ANSI/ISA-60079-29-1 is intended to provide for the supply of apparatus giving a level of safety and performance suitable for general purpose applications. However, for specific applications, a prospective purchaser (or an appropriate authority) may additionally require th
26、e apparatus to be submitted to particular tests or approval. For example, Group I apparatus (i.e. apparatus to be used in mines susceptible to firedamp) may not be permitted to be used without the additional, prior approval of the relevant authority in mines under its jurisdiction. Such particular t
27、ests/approval are to be regarded as additional to and separate from the provisions of the standards referred to above and do not preclude certification to or compliance with these standards. NOTE 2 All apparatus calibrated on specific gases or vapours can not be expected to correctly indicate on oth
28、er gases or vapours. NOTE 3 For the purposes of this standard, the terms “lower flammable limit (LFL)“ and “lower explosive limit (LEL)“ are deemed to be synonymous, and likewise the terms “upper flammable limit (UFL)“ and “upper explosive limit (UEL)“ are deemed to be synonymous. For ease of refere
29、nce, the two abbreviations LFL and UFL may be used hereinafter to denote these two sets of terms. It should be recognized that particular authorities having jurisdiction may have overriding requirements that dictate the use of one of these sets of terms and not the other. NOTE 4 For the purposes of
30、this standard, the term “indicating up to a volume fraction of X %” includes apparatus with an upper limit of the measuring range equal to or less than X %. ANSI/ISA-60079-29-1 (12.13.01)-2013 - 12 - 2 Normative rReferences The following referenced documents are indispensable for the application of
31、this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC ANSI/ISA-60079-0: Electrical apparatus for explosive gas atmospheres Part 0: General requirements IEC 60079-20: Electrica
32、l apparatus for explosive gas atmospheres Part 20: Data for flammable gases and vapours, relating to the use of electrical apparatus ANSI/NFPA 497: Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installation i
33、n Chemical Process Areas ANSI/NFPA 70: National Electrical Code IEC ANSI/ISA-60079-29-2:, Explosive atmospheres Part 29-2: Gas detectors Selection, installation, use and maintenance of detectors for flammable gases and oxygen ANSI/IEC 60529: Degrees of protection provided by enclosures (IP) IEC 6100
34、0-4-1: Electromagnetic compatibility (EMC) Part 4-1: Testing and measurement techniques Overview of IEC 61000-4 series. Basic EMC publication IEC 61000-4-3: Electromagnetic compatibility (EMC) Part 4-3: Testing and measurement techniques Radiated, radio-frequency, electromagnetic field immunity test
35、. Basic EMC publication IEC 61000-4-4: Electromagnetic compatibility (EMC) Part 4-4: Testing and measurement techniques Electrical fast transient/burst immunity test Basic EMC publication 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC ANSI/ISA-60079
36、-0 and the following apply. NOTE 1 Additional definitions applicable to explosive atmospheres can be found in Chapter 426 of the International Electrotechnical Vocabulary (IEV) IEC 60050 (426). NOTE 2 The term “equipment” and “apparatus” within the document are synonyms. 3.1 Gas properties 3.1.1 amb
37、ient air normal atmosphere surrounding the apparatus 3.1.2 clean air air that is free of flammable gases and interfering or contaminating substances 3.1.3 explosive gas atmosphere mixture with air, under normal atmospheric conditions, of flammable substances in the form of gas or vapour, in which, a
38、fter ignition, permits self-sustaining flame propagation NOTE 1 This definition specifically excludes dusts and fibres in suspension in air. Mists are not covered by this standard. NOTE 2 Although a mixture that has a concentration above the upper flammable limit (see 3.1.9) is not an explosive atmo
39、sphere, in certain cases for area classification purposes, it is advisable to consider it as an explosive gas atmosphere. - 13 - ANSI/ISA-60079-29-1 (12.13.01)-2013 NOTE 3 Normal atmospheric conditions include variations above and below the reference levels of 101,3 kPa and 20 C provided the variati
40、ons have a negligible effect on the explosive properties of the flammable materials. 3.1.4 firedamp flammable gas, consisting mainly of methane, found naturally in mines 3.1.5 flammable gas gas or vapour which, when mixed with air in a certain proportion, will form an explosive atmosphere NOTE For t
41、he purposes of this standard, the term “flammable gas“ includes flammable vapours. 3.1.6 lower flammable limit LFL volume fraction of flammable gas or vapour in air, below, which an explosive gas atmosphere does not form, expressed as a percentage (see IEC 60079-20 ANSI/NFPA 497) NOTE This is also k
42、nown as lower explosive limit (LEL). 3.1.7 poisons (for sensors) substances, which lead to temporary or permanent loss of sensitivity of the sensors 3.1.8 potentially explosive atmosphere atmosphere that could become explosive (the danger is a potential one) NOTE This would include an atmosphere wit
43、h gas concentration currently above UFL, where dilution with air would render it explosive. 3.1.9 upper flammable limit UFL volume fraction of flammable gas or vapour in air, above, which an explosive gas atmosphere does not form, expressed as a percentage (see IEC 60079-20 ANSI/NFPA 497) NOTE This
44、is also known as upper explosive limit (UEL). 3.1.10 volume fraction (v/v) quotient of the volume of a specified component and the sum of the volumes of all components of a gas mixture before mixing, all volumes referring to the pressure and the temperature of the gas mixture NOTE The volume fractio
45、n and volume concentration take the same value if, at the same state conditions, the sum of the component volumes before mixing and the volume of the mixture are equal. However, because the mixing of two or more gases at the same state conditions is usually accompanied by a slight contraction or, le
46、ss frequently, a slight expansion, this is not generally the case. 3.1.11 zero gas gas recommended by the manufacturer, which is free of flammable gases, and interfering and contaminating substances, the purpose of which is calibration/adjustment of the apparatus zero 3.2 Types of instruments 3.2.1
47、alarm-only apparatus apparatus having an alarm but not having a meter or other indicating device ANSI/ISA-60079-29-1 (12.13.01)-2013 - 14 - 3.2.2 aspirated apparatus apparatus that samples the gas by drawing it to the gas sensor for example, by means of a hand-operated or electric pump 3.2.3 continu
48、ous duty apparatus apparatus that is powered for long periods of time, but may have either continuous or intermittent sensing 3.2.4 diffusion apparatus apparatus in which the transfer of gas from the atmosphere to the gas sensor takes place by random molecular movement, i.e. under conditions in whic
49、h there is no aspirated flow 3.2.5 fixed apparatus apparatus that is intended to have all parts permanently installed 3.2.6 Group I apparatus apparatus for mines susceptible to firedamp 3.2.7 Group II apparatus apparatus for places with a potentially explosive atmosphere hazardous (classified) location, other than mines susceptible to firedamp 3.2.8 portable apparatus spot-reading or continuous duty apparatus that has been designed to be readily carried from place to place and to be used while it is being carried. A portab
