1、 RECOMMENDED PRACTICE ISARP92.04.02, Part II1996 (R2013) Installation, Operation, and Maintenance of Instruments Used to Detect Oxygen-Deficient/ Oxygen-Enriched Atmospheres Reaffirmed 16 January 2013 Copyright 2013 by the International Society of Automation. All rights reserved. Printed in the Unit
2、edStates 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 12277Resear
3、ch Triangle Park, North Carolina 27709ISARP92.04.02, Part II1996 (R2013), Installation, Operation, and Maintenance of Instruments Used To Detect Oxygen-Deficient/Oxygen-Enriched AtmospheresISBN: 978-1-937560-94-2ISA-92.04.02, Part II-1996 (R2013) 3 Preface This preface, all footnotes, and annexes ar
4、e included for informational purposes and are not a part of ISA-RP92.04.02, Part II-1996 (R2013). This recommended practice has been prepared as a part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this document should not be static but shoul
5、d be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Standards and Practices Board Secretary; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (919) 549-8411; Fax (919) 549-8288;
6、 Internet: 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 Department is further aware of t
7、he 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 endeavour to introduce SI-acceptable metric units in all new and revised standards,
8、 recommended practices, and technical reports to the greatest extent possible. IEEE/ASTM SI 10, American National Standard for Metric Practice, and future revisions, will be the reference guide for definitions, symbols, abbreviations, and conversion factors. It is the policy of ISA to encourage and
9、welcome the participation of all concerned individuals and interests in the development of ISA standards, recommended practices, and technical reports. Participation in the ISA standards-making process by an individual in no way constitutes endorsement by the employer of that individual, of ISA, or
10、of any of the standards that ISA develops. CAUTION ISA DOES NOT TAKE ANY POSITION WITH RESPECT TO THE EXISTENCE OR VALIDITY OF ANY PATENT RIGHTS ASSERTED IN CONNECTION WITH THIS DOCUMENT, AND ISA DISCLAIMS LIABILITY FOR THE INFRINGEMENT OF ANY PATENT RESULTING FROM THE USE OF THIS DOCUMENT. USERS AR
11、E ADVISED THAT DETERMINATION OF THE VALIDITY OF ANY PATENT RIGHTS, AND THE RISK OF INFRINGEMENT OF SUCH RIGHTS, IS ENTIRELY THEIR OWN RESPONSIBILITY. PURSUANT TO ISAS PATENT POLICY, ONE OR MORE PATENT HOLDERS OR PATENT APPLICANTS MAY HAVE DISCLOSED PATENTS THAT COULD BE INFRINGED BY USE OF THIS DOCU
12、MENT AND EXECUTED A LETTER OF ASSURANCE COMMITTING TO THE GRANTING OF A LICENSE ON A WORLDWIDE, NON-DISCRIMINATORY BASIS, WITH A FAIR AND REASONABLE ROYALTY RATE AND FAIR AND REASONABLE TERMS AND CONDITIONS. FOR MORE INFORMATION ON SUCH DISCLOSURES AND LETTERS OF ASSURANCE, CONTACT ISA OR VISIT WWW.
13、ISA.ORG/STANDARDSPATENTS. OTHER PATENTS OR PATENT CLAIMS MAY EXIST FOR WHICH A DISCLOSURE OR LETTER OF ASSURANCE HAS NOT BEEN RECEIVED. ISA IS NOT RESPONSIBLE FOR IDENTIFYING PATENTS OR PATENT APPLICATIONS FOR WHICH A LICENSE MAY BE REQUIRED, FOR CONDUCTING INQUIRIES INTO THE LEGAL VALIDITY OR SCOPE
14、 OF PATENTS, OR DETERMINING WHETHER ANY LICENSING TERMS OR CONDITIONS PROVIDED IN CONNECTION WITH SUBMISSION OF A LETTER OF ASSURANCE, IF ANY, OR IN ANY LICENSING AGREEMENTS ARE REASONABLE OR NON-DISCRIMINATORY. ISA REQUESTS THAT ANYONE REVIEWING THIS DOCUMENT WHO IS AWARE OF ANY PATENTS THAT MAY IM
15、PACT IMPLEMENTATION OF THE DOCUMENT NOTIFY THE ISA STANDARDS AND PRACTICES DEPARTMENT OF THE PATENT AND ITS OWNER.4 ISA-92.04.02, Part II-1996 (R2013) ADDITIONALLY, THE USE OF THIS DOCUMENT MAY INVOLVE HAZARDOUS MATERIALS, OPERATIONS OR EQUIPMENT. THE DOCUMENT CANNOT ANTICIPATE ALL POSSIBLE APPLICAT
16、IONS OR ADDRESS ALL POSSIBLE SAFETY ISSUES ASSOCIATED WITH USE IN HAZARDOUS CONDITIONS. THE USER OF THIS DOCUMENT MUST EXERCISE SOUND PROFESSIONAL JUDGMENT CONCERNING ITS USE AND APPLICABILITY UNDER THE USERS PARTICULAR CIRCUMSTANCES. THE USER MUST ALSO CONSIDER THE APPLICABILITY OF ANY GOVERNMENTAL
17、 REGULATORY LIMITATIONS AND ESTABLISHED SAFETY AND HEALTH PRACTICES BEFORE IMPLEMENTING THIS DOCUMENT. THE USER OF THIS DOCUMENT SHOULD BE AWARE THAT THIS DOCUMENT MAY BE IMPACTED BY ELECTRONIC SECURITY ISSUES. THE COMMITTEE HAS NOT YET ADDRESSED THE POTENTIAL ISSUES IN THIS VERSION. The following m
18、embers of ISA Subcommittee SP92.04 developed this Recommended Practice: NAME COMPANY R. Novack, Chairperson AMETEK D. Bishop, Managing Director Chevron USA Production Company *W. Alexander Mine Safety Appliances Company S. Bruce Delphian Corporation J. Chang Motorola SPS J. Chilton U.S. Bureau of Mi
19、nes M. Coppler Bacharach, Inc. T. Donkin Enmet Corporation A. Gimbrone Gantech Association A. Gottlieb Random Technologies A. Guerrera Control Systematolotists, Inc. S. Hildebrand Exxon Company USA B. Holcom Gas Tech, Inc. K. Johnson KWJ Engineering, Inc. D. Li Canadian Standards Association *R. Loe
20、ffelholz National Draeger, Inc. *S. Long Mine Safety Appliances Company T. Loomis Consultant B. Matheson Sensidyne, Inc. *J. McCann International Sensor Technology *J. McGowan International Sensor Technology A. McNiel Consultant B. Northam Munro Electronics *H. Oetjen National Draeger, Inc. R. Ring
21、Mine Safety Appliances Company M. Schaeffer Control Instruments Corporation *K. Shaffer National Draeger, Inc. R. Smith Illinois Instruments, Inc. J. Thomason Omni Industrial Systems, Inc. R. Warburton National Draeger, Inc. D. Wolsk Wolsk Alarms, Ltd. J. Zabrenski Air Products b) The instrument mus
22、t meet the requirements of the applicable authority having jurisdiction; andc) The instrument must be compatible with the environmental conditions; e.g., relative humidity, temperature, altitude, and atmospheric contaminants, etc. in which the instrument is to operate. A typical “Environmental and A
23、pplication Checklist,“ included as Annex A, is intended to aid users in properly specifying requirements for their specific applications.10 ISA-RP92.04.02, Part II-1996 (R2013)4 Unpacking4.1 Unpack the shipping carton(s) and determine whether the order is complete “as received.“ Check for main assem
24、bly, accessories, spare parts, and instruction manual.4.2 In the event of shipment damage or for purposes of future correspondence, record the following:a) Users purchase order number and manufacturers order number and their respective datesb) Carrier waybill number and date received in case of tran
25、sit claimc) Instrument serial number and user identification (ID) number, if assigned5 Storage5.1 When storing oxygen detection instruments, leave the instruments in their original containers or provide suitable protective covers.5.2 Select a storage location that is in accordance with the manufactu
26、rers recommendations. The environmental conditions (temperature, humidity, etc.) should comply with the manufacturers storage specifications.5.3 Before storage, inspect the instruments and remove any internal batteries and sensors that could cause corrosion, as directed by the manufacturers instruct
27、ions. If the instruments have rechargeable or “permanent“ batteries, consult the manufacturers instructions for battery maintenance during this period.6 User record keeping6.1 It is recommended that usersa) assign an equipment identification (control) number to each instrument; andb) maintain comple
28、te records including periodic performance, calibration, and maintenance checks. (See Annex B.)ISA-RP92.04.02, Part II-1996 (R2013) 117 Maintenance7.1 To maintain the reliability of oxygen detection instruments, it is recommended that users assign responsibility for their initial inspection and subse
29、quent use, including maintenance, to a specific qualified individual or group.7.2 It is important that the checkout procedures (see Clause 10) be performed by qualified personnel who are trained in the operation, maintenance, and repair of instruments, and that the group responsible for maintenance
30、be defined clearly.7.3 It is recommended that users establish responsibility for obtaining the gas mixture recommended for calibration and testing by the instrument manufacturer.7.4 It is recommended that when instruments are first put into use, the calibration be checked on a routine basis, as pres
31、cribed by the manufacturer. If experience shows minimal calibration deviation, then the period between calibration checks may be extended. Likewise, if routine checks indicate an increasing need for calibration, the period should be shortened and the cause should be investigated.8 Preparing instrume
32、nts for useRead and understand the manufacturer-provided instruction manual. Pay particular attention to the location and functions of all controls and readout devices.It is recommended that a shop calibration test of the type described in 13.7 be performed before the initial use of any oxygen-detec
33、ting instrument.9 Installation of stationary instrumentsIt is extremely important that the equipment manufacturer-provided instruction manual be read thoroughly and followed completely.9.1 Installation in hazardous (classified) locationsIf instruments or ancillary components are installed in a hazar
34、dous (classified) location, they must be suitable for the area in which they are installed and so marked. Hazardous (classified) locations in the United States are defined by the National Electrical Code, NFPA 70-1993, Articles 500-504. Markings required by ANSI/ISA-S92.04.01, Part I, should be visi
35、ble to the operator. Installation of intrinsically safe systems shall be in accordance with ANSI/ISA-RP12.6, Installation of Intrinsically Safe Systems for Hazardous (Classified) Environments.NOTE Oxygen enrichment presents increased ignition risk, especially in a hazardous 12 ISA-RP92.04.02, Part I
36、I-1996 (R2013)(classified) location. This Recommended Practice should not be interpreted as suggesting that these instruments may be used routinely in hazardous locations in oxygen-enriched atmospheres.9.2 Detector locationsWhile many factors are involved in detector-head quantity and location selec
37、tion, industry standards and applicable regulations may dictate quantities and general or specific locations, and the following should be considered:a) Air movement: Air velocity, and temperature influence the dispersion of vapors/gases to be monitored.b) Ambient temperature (see 9.8)c) Vibration (s
38、ee 9.7)d) Accessibility for future maintenance and calibration requirementse) Structural arrangements (such as walls, troughs, or partitions), to avoid accumulation of gasesf) Mechanical damage and contamination: Detectors should be installed in locations that would preclude mechanical damage from n
39、ormal operations (e.g., cranes, traffic, exhausts, and wash-downs).g) Chemical damage and corrosion (e.g., corrosive gases and liquids, marine and industrial exposure)h) Protection of personneli) Possible sources of electromagnetic interference/radio frequency interference (EMI/RFI)j) Density and ot
40、her characteristics of possible displacing gases, including humidity9.3 Detector heads must be connected to their respective control units, as specified by the manufacturer (observing maximum loop resistance, minimum wire size, isolation, etc.). Interconnections must be made using cable, wire, and c
41、onduit or other system suitable for the purpose and the area classification.9.4 Equipment required to be connected to ground in order to provide protection from electrical shock hazards shall be connected effectively with the general mass of the earth through a grounding system. The grounding system
42、 shall have sufficiently low impedance and shall have a current-carrying capacity sufficient at all times, under the most severe conditions that are likely to arise in practice, to prevent current in the grounding conductor from causing a potential of 30 V rms or 42.4 V peak to exist between accessi
43、ble conductive parts of the equipment and adjacent accessible conductive surfaces within a 3.7 meter (12 ft.) radius. Where wet contact may occur, the maximum potential is reduced to 15 V rms or 21.2 V peak. This grounding system performance shall remain effective under all conditions.ISA-RP92.04.02
44、, Part II-1996 (R2013) 139.5 To minimize electromagnetic interference (EMI), it is recommended that properly grounded, shielded, interconnecting cables (or wire and conduit) be used, and that enclosures (if of conductive material) be adequately grounded. It is recommended that cable shields be groun
45、ded at one point only: the controller end. It is recommended that splices in interconnecting sensor wiring be properly soldered (see 9.3).9.6 If lubrication is used on threaded connections, it should be ascertained that the lubricant used contains no substance that might adversely affect the sensing
46、 elements or shielding.9.7 All instruments and detector heads should be mounted in a manner to minimize vibration.9.8 All detector heads and instruments should be mounted in areas that ensure compliance with the manufacturers operating temperature specifications.9.9 Adequate drainage should be incor
47、porated into the system design to minimize moisture and condensation in the instrument, detector head, and interconnecting cable/conduit system.9.10 Any potentially flammable or toxic gases introduced into sampling systems should be vented in a safe and appropriate manner.9.11 When interconnecting a
48、ncillary devices, maximum current and voltage ratings of the instruments outputs (e.g., interposing relay contacts) must be observed. These include barriers, isolation devices and other intrinsically safe and associated apparatus. (See NFPA 70, Article 504.)10 Equipment checkout procedures10.1 Porta
49、ble instruments10.1.1 With reference to and in accordance with the instruction manual, perform the following steps where applicable and necessary.a) With the power OFF, reset the mechanical zero of any analog meters.b) Ascertain that all electrical connections are properly tightened (remote detector head, power supply, etc.).c) Check the battery voltage and battery condition, and make any required adjustments or battery replacements.d) Check and replace clogged, dirty,
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