1、 IEC 60584-3Edition 2.0 2007-11INTERNATIONAL STANDARD NORME INTERNATIONALEThermocouples Part 3: Extension and compensating cables Tolerances and identification system Couples thermolectriques Partie 3: Cbles dextension et de compensation Tolrances et systme didentification IEC60584-3:2007 THIS PUBLI
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16、tactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60584-3Edition 2.0 2007-11INTERNATIONAL STANDARD NORME INTERNATIONALEThermocouples Part 3: Extension and compensating cables Tolerances and identification system Couples thermolectriques Partie 3: Cbles dextension et de co
17、mpensation Tolrances et systme didentification INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE JICS 17.200.20 PRICE CODECODE PRIXISBN 2-8318-9453-0 2 60584-3 IEC:2007 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ THERMOCOUPLES Part 3: Extension and compensating cab
18、les Tolerances and identification system FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote interna-tional co-operation on all q
19、uestions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Techni-cal Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publica
20、tion(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organiza-tions liaising with the IEC also participate in this preparation. IEC
21、 collaborates closely with the International Or-ganization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of op
22、inion on the relevant subjects since each technical committee has representation from all inter-ested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made t
23、o ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinter-pretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transpare
24、ntly to the maximum extent possible in their national and regional publications. Any divergence be-tween any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be re
25、ndered responsible for any equip-ment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members o
26、f its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and ex-penses arising out of the publication, use of, or reliance upon, this IEC Publication or an
27、y other IEC Publica-tions. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may
28、be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60584-3 has been prepared by subcommittee 65B: Devices and process analysis, of IEC Technical Committee 65: Industrial-process measurement, control and automat
29、ion. This second edition cancels and replaces the first edition of IEC 60584-3 issued in 1989. It constitutes a technical revision. The main technical changes with regard to the previous edition are as follows: Addition of Subclause 5.4 Connectors. Addition of Clauses 7 Dimensions and 8 Requirements
30、. 60584-3 IEC:2007 3 The text of this standard is based on the following documents: FDIS Report on voting 65B/642/FDIS 65B/646/RVDFull information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in a
31、ccordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 60584 series, under the general title Thermocouples, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the
32、 IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 4 60584-3 IEC:2007 THERMOCOUPLES Part 3: Extension and compensating cables Tolerances and identificati
33、on system 1 Scope This part of IEC 60584 specifies manufacturing tolerances for extension and compensating cables (other than mineral insulated cables) provided directly to users of industrial processes. These tolerances are determined with respect to the e.m.f.-temperature relationship of Part 1 of
34、 the standard. The method for identification of insulated thermocouple extension and compensating cables other than mineral insulated cables is described. Furthermore, requirements for extension and compensating cables for use in industrial pro- cess control are specified. 2 Normative references The
35、 following referenced documents are indispensable for the application of 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 60584-1:1995, Thermocouples Part 1: Reference ta
36、bles 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 extension and compensating cables are used for the electrical connection between the open ends of a thermocouple and the ref-erence junction in those installations where the conductors of t
37、he thermocouple are not di-rectly connected to the reference junction. The thermoelectric properties of extension and compensating cables shall be close to the properties of the corresponding thermocouple. 3.1.1 extension cables are manufactured from conductors having the same nominal composition as
38、 those of the cor-responding thermocouple. They are designated by the letter “X“ following the designation of the thermocouple, for example “JX“. 3.1.2 compensating cables are manufactured from conductors having a composition different from the corresponding thermocouple. They are designated by the
39、letter “C“ following the designation of the thermo-couple, for example “KC“. In some cases different tolerances apply for the same thermocou-ple type over different temperature ranges. These are distinguished by additional letters such as, for example, KCA and KCB. 60584-3 IEC:2007 5 3.2 tolerance t
40、he tolerance of an extension or compensating cable is the maximum additional deviation in microvolts caused by the introduction of the extension or compensating cable into the meas-uring circuit. 4 Tolerance values Table 1 shows the specified tolerance for extension and compensating cables when used
41、 at temperatures within the ranges indicated as “Cable temperature range“. Table 1 Tolerance classes for extension and compensating cables Tolerance class Type 1 2 Cable temperature range Measuring junctiontemperature JX 85 V (1,5 C) 140 V (2,5 C) 25 C to +200 C 500 C TX 30 V (0,5 C) 60 V (1,0 C) 25
42、 C to +100 C 300 C EX 120 V (1,5 C) 200 V (2,5 C) 25 C to +200 C 500 C KX 60 V (1,5 C) 100 V (2,5 C) 25 C to +200 C 900 C NX 60 V (1,5 C) 100 V (2,5 C) 25 C to +200 C 900 C KCA 100 V (2,5 C) 0 C to +150 C 900 C KCB 100 V (2,5 C) 0 C to +100 C 900 C NC 100 V (2,5 C) 0 C to +150 C 900 C RCA 30 V (2,5
43、C) 0 C to +100 C 1 000 C RCB 60 V (5,0 C) 0 C to +200 C 1 000 C SCA 30 V (2,5 C) 0 C to +100 C 1 000 C SCB 60 V (5,0 C) 0 C to +200 C 1 000 C NOTE 1 Cable temperature range may be restricted to figures lower than those shown in the table because of temperature limitations imposed by the insulant. NO
44、TE 2 A cable comprising two copper conductors may be used with Type B thermocouples. The expected maximum additional deviation within the cable temperature range 0 C to +100 C is 40 V. The equivalent in temperature is 3,5 C when the measuring junction of the thermocouple is at 1 400 C. NOTE 3 Tolera
45、nces are specified in microvolts. The table also includes, in parentheses, the approximate equivalent tolerances in degrees Celsius. Because thermocouple e.m.f.-temperature relationships are non-linear, the tolerance in degrees Celsius depends on the temperature of the measuring junction of the ther
46、mo-couple. The figures shown in the table are those appropriate to the measuring junction temperatures in the final column. In most cases the error expressed in degrees Celsius will be larger at lower thermocouple junction temperatures. 5 Colour coding 5.1 Negative conductor The insulation of the ne
47、gative conductor shall be WHITE for all thermocouple types. 5.2 Positive conductor The insulation of the positive conductor shall be as given in Table 2. 5.3 Outer sheath The outer sheath, if any, shall be coloured as given in Table 2. If for intrinsically safe circuits the outer sheath is coloured
48、BLUE, then the thermocouple type shall be indicated by other means, for instance by printed or coloured tags (colour as given in Table 2). 6 60584-3 IEC:2007 Table 2 Colour code for extension and compensating cables Thermocouple type Colour of positive conductor and sheath insulation T Brown E Violet J Black K Green N Pink B GreyR Orange S Orange 5.4 Connectors The connectors, if any, used in conjunction with thermocouples and compensating or exten-sion cables, shall be coloured as given in Table 2. The colouring may be a mass colouring or a coloured dot on the connectors surface. 6
