1、 AMERICAN NATIONAL STANDARD ANSI/ISA-12.13.04-2007 (R2014) Performance Requirements for Open Path Combustible Gas Detectors Approved 26 February 2014 Commitment for Amendments This standard is issued jointly by ISA and FM Approvals (FM). Comments or proposals for revisions on any part of the standar
2、d may be submitted to ISA or FM at any time. Revisions to this standard will be made only after processing according to the standards development procedures of ISA and FM. ISA and FM will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of
3、issue. ISBN 978-0-876640-68-5 Copyright 2014 By ISA These materials are subject to copyright claims of ANSI and ISA. All rights reserved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced in any form, including an electronic retrieval system, with
4、out the prior written permission of ISA. All requests pertaining to this standard should be submitted to ISA. 2014 FM Approvals LLC. All rights reserved. ISA FM Approvals ANSI/ISA-12.13.04 ANSI/FM 6325 First Edition First Edition Performance Requirements for Open Path Combustible Gas Detectors This
5、page intentionally left blank. 26 February 2014 ANSI/ISA-12.13.04 ANSI/FM 6325-2007 (R2014) 5 General Notes This is the common ISA and FM standard for Performance Requirements for Open Path Combustible Gas Detectors. It is the first edition of ANSI/ISA-12.13.04 and the first edition of ANSI/FM 6325.
6、 ANSI/ISA-12.13.04 and ANSI/FM 6325 contain identical requirements and identical publication dates. The presentation and format of the standards material may differ between the two published standards. This common standard was prepared by ISA and FM Approvals. Effective Date The effective date for I
7、SA and FM Approvals is the date of publication. This page intentionally left blank. 26 February 2014 ANSI/ISA-12.13.04 ANSI/FM 6325-2007 (R2014) 7 Preface (ISA) This preface, as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-12.13.04. This documen
8、t has been prepared as part of the service of ISA towards 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 ad
9、dressed 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 Department is aware of the growing need for attention to the me
10、tric 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 USA users of ISA standards of incorporating suitable references to the SI (and the metric system) in their bu
11、siness 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 possible. Standard for Use of the International System o
12、f Units (SI): The Modern Metric System, published by the American Society for Testing 10% LFL x 10 meter = 1 LFLmeter. 2.14.6 lower flammable limit (LFL): the volume ratio of combustible gas or vapor in air below which a combustible gas atmosphere will not be formed 2.14.7 upper flammable limit (UFL
13、): the volume ratio of combustible gas or vapor in air above which a combustible gas atmosphere will not be formed 2.15 lower flammable limit meters (LFLm): a unit of measurement for the amount of gas present in the beam. The LFLm represents the size of a gas cloud multiplied by the gas concentratio
14、n within the cloud. See Figure A.1 of Annex A. 2.15.1 lower flammable limit/meters or path average (%LFL(Avg): a unit of measurement for the amount of gas present in the beam over the length of the beam. The %LFL(Avg) represents the size of a gas cloud multiplied by the gas concentration within the
15、cloud divided by the beam length multiplied by 100. See Figure A.2 of Annex A. 2.16 measurement range: the range of measurement of the detector from the lowest indicated reading, usually “the zero point,” to the highest indicated reading, commonly known as “full scale.” A detector may have multiple
16、measurement ranges and some means of selecting the desired range of measurement. 2.17 optical apparatus 2.17.1 gas cell: a sealed enclosure with transparent ends which can be filled with test gases. 16 ANSI/ISA-12.13.04 ANSI/FM 6325-2007 (R2014) 26 February 2014 2.17.2 open path: the path taken by t
17、he optical radiation from the transmitter to the receiver as it traverses an atmosphere through which gases are free to move. 2.17.3 optical radiation: energy emitted by the transmitter in the form of electromagnetic radiation within a specific region or regions of the electromagnetic spectrum, for
18、example ultra-violet, visible, or infrared light. 2.17.4 receiver: an assembly in which the optical detecting element(s) are housed and which may contain associated optical and electrical components. 2.17.5 reflector: a device that returns or reflects light. 2.17.6 transceiver: an assembly in which
19、the optical detecting element(s) and optical source(s) are housed and which may contain associated optical and electrical components. 2.17.7 transmitter: an assembly in which the optical source(s) are housed and which may contain associated optical and electrical components. 2.18 response conversion
20、 data: information, supplied and explained in the gas detection apparatus instruction manual, enabling the apparatus user to determine the concentration of the gas to be monitored that will produce the same response as a known concentration of another gas used for calibration. 2.19 signals and indic
21、ations 2.19.1 fault signal: an audible, visual, or other type of output which provides, directly or indirectly, a warning or indication that the apparatus has been compromised. 2.19.2 beam blocked signal: an audible, visual or other type of output which provides, directly or indirectly, a warning or
22、 indication that the optical path is obscured or that the signal detected is too weak to enable the apparatus to function normally. 2.19.3 inhibition signal: an audible, visual, or other type of output which provides, directly or indirectly, a warning or indication that normal operation has been sus
23、pended. 2.19.4 indicating devices: means for displaying values or states in analog or digital form. 2.20 span: the algebraic difference between the upper and lower values of a range. 2.21 stand-alone control unit: control unit that receives a corresponding relay or signal from stand-alone gas detect
24、or(s) and is intended to provide meter indication, alarm functions, and/or output contacts. 26 February 2014 ANSI/ISA-12.13.04 ANSI/FM 6325-2007 (R2014) 17 2.22 stand-alone detector: a combination transmitter and receiver either integral or remote that produce a relay or signal to be utilized by an
25、unspecified control apparatus. Such apparatus is intended to be interfaced to a separate control unit, signal processing data acquisition, central monitoring, or other similar system in which the apparatus provides a conditioned electronic signal or output indication to systems of the aforementioned
26、 type that typically process information from various locations and sources including, but not limited to, gas detection apparatus. 2.23 stationary apparatus: a gas detection apparatus intended for permanent installation in a fixed location. 2.24 transportable apparatus: apparatus which is not inten
27、ded to be portable, but which can be moved from one place to another and used after alignment. 2.25 zero point: the lower calibration value, normally clean air. 3 General requirements 3.1 Introduction 3.1.1 Where an apparatus manufacturer makes any claims regarding any special features of constructi
28、on or superior performance that exceed these minimum requirements, all such claims shall be verified and the test procedures shall be extended or supplemented where necessary to verify the claimed performance. 3.1.2 Electrical assemblies and components shall comply with the construction and test req
29、uirements of 3.4 and Clause 4, where applicable. In addition, parts of the apparatus intended for use in hazardous (classified) locations shall employ materials and comply to the construction and explosion protection as specified in the appropriate standards. 3.2 Markings 3.2.1 Marking on the produc
30、t or, if not possible due to size, on the packaging or label accompanying the product, shall include the following information: a) Manufacturers name or trademark and address b) Specific model designation and serial number c) Apparatus ratings (voltage, frequency, current or power, etc.) d) Apparatu
31、s operating ambient temperature range e) “ANSI/ISA-12.13.04 / ANSI/FM 6325” 3.2.2 The model or type identification shall correspond to the manufacturers catalog designation and shall uniquely identify the product. 3.2.3 The marking required in 3.2.4 shall appear legibly and indelibly on each gas det
32、ection apparatus in the following manner, as applicable: 18 ANSI/ISA-12.13.04 ANSI/FM 6325-2007 (R2014) 26 February 2014 a) For stationary apparatus, the marking required in 3.2.4 shall appear in a location where it will be visible after installation and in direct sight during the routine periodic r
33、e-calibration and adjustment of set point(s). b) For modular control units comprising one or more control modules in a common enclosure or mounting assembly, the marking need not be repeated on each module, but may appear as a single marking on the common portion of the assembly. c) Where the design
34、 of a stationary control unit is such that there is insufficient space for this marking to appear on the portion of the unit that is visible after installation (e.g., compact designs for close panel mounting), the marking required by 3.2.4 is permitted to appear elsewhere on the control unit, provid
35、ed that a second duplicate label (with an acceptable adhesive) bearing such marking is supplied with each such control unit (or assembly of control units), together with the instructions that it is to be attached by the user in a conspicuous location after installation, as close as possible to the c
36、ontrol unit. 3.2.4 All open path gas detection apparatus shall be marked: CAUTION READ AND UNDERSTAND INSTRUCTION MANUAL BEFORE OPERATING OR SERVICING. The word CAUTION of the foregoing shall be in capital letters at least 3.0 mm high. The balance of the wording shall be in capital letters at least
37、2.5 mm high. 3.2.5 Where the design of special features of the apparatus requires additional markings or a change in marking requirements, the additions or revisions are allowed, but the safety and instructional intent of this clause shall be met. 3.3 Manufacturers installation and operation manual
38、3.3.1 Each gas monitoring apparatus shall be provided with an instruction manual, furnished by the manufacturer. The requirements of 3.3.2 through 3.3.5 shall be included as applicable. Instructions shall be consistent with the markings required in 3.2. 3.3.2 The following shall be incorporated in t
39、he manufacturers instruction and operation manual: 1) Installation instructions 2) Operating instructions 3) Maintenance instructions 4) Troubleshooting guide including a list of all fault indications 5) Certification information as applicable 6) Consideration of known conditions that may impair the
40、 reliability of the open path gas monitoring apparatus 7) Optional accessories (e.g. aperture, weather-protecting devices) and state their effects on the instrument 8) Details of any special conditions of service 9) List of available gas calibrations with corresponding accuracy and t90 response time
41、 26 February 2014 ANSI/ISA-12.13.04 ANSI/FM 6325-2007 (R2014) 19 10) For a stand alone open path gas detector or a stand alone control unit the following note shall be provided: “The t90 response time of the stand alone open path gas detector and the stand alone control unit shall be added together
42、and shall not exceed 10 seconds.” 11) Electromagnetic compatibility 3.3.3 Details of the operational limitations shall include, where applicable, the following: 1) Gases for which the apparatus is suitable and the relative sensitivities of the instrument to these gases 2) Information that describes
43、the sensitivities to other gases to which the apparatus is responsive 3) Temperature limits 4) Humidity ranges 5) Supply voltage limits 6) Inrush and normal operating currents 7) Relevant characteristics and construction details of required interconnecting cables including maximum length of lines, l
44、oop resistance, and minimum wire size for wiring between the control unit, transmitter, and receiver needed for shielding of wiring 8) Battery data (i.e. battery charging, battery life and specification) 9) Pressure limits 10) Warm-up time 11) Stabilization time 12) Minimum and maximum path length 1
45、3) Electromagnetic compatibility 3.3.4 Details of the storage life and limitations for apparatus, replacement parts, and accessories, shall include, where applicable, the following: 1) Temperature 2) Humidity 3) Time 4) Pressure 5) Poisons 6) Interfering gases 3.3.4.1 The basis used for converting t
46、est and calibration gas concentrations from % LFL to % volume fraction shall be provided. 20 ANSI/ISA-12.13.04 ANSI/FM 6325-2007 (R2014) 26 February 2014 3.3.4.2 Statements of the nature and significance of all alarms and fault signals, the duration of such alarms and signals (if time-limited or non
47、-latching) and any provisions that may be made for silencing or resetting such alarms and signals, as applicable, shall be provided. 3.3.4.3 For battery-operated apparatus, installation and maintenance instructions for the batteries shall be provided. 3.3.4.4 A recommended replacement parts list sha
48、ll be provided. 3.3.4.5 Where optional accessories (e.g. collecting cones, weather-protecting devices) are supplied, the manufacturer shall list them and state their effects on the instrument characteristics (e.g. including response time and sensitivity) and provide means for identification of these
49、 (e.g. part numbers included in manual). 3.3.4.6 Clarification that the apparatus will integrate the measurement over the full length of path to a reading that represents the diameter of the cloud at 100%LFL concentration regardless of the actual concentration shall be given. This clause shall provide multiple examples of gas clouds varying in size and concentration that will produce the same indication. Additionally, it shall recommend that user determine the size cloud they wish to prevent against and set the alarm points as a fraction of the dete
