1、BRITISH STANDARD BS EN 50212:1997 Connectors for thermoelectric sensors The European Standard EN 50212:1996 has the status of a British Standard ICS 17.200.20BSEN 50212:1997 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe au
2、thority of the Standards Board and comes into effect on 15 May 1997 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference GEL/65 Draft for comment 95/209650 DC ISBN 0 580 27115 3 Committees responsible for this British Standard The preparation of this Brit
3、ish Standard was entrusted to Technical Committee GEL/65, Measurement and control, upon which the following bodies were represented: British Gas plc British Nuclear Fuels plc Electrical Contractors Association Electricity Association Energy Industries Council GAMBICA (BEAMA Ltd.) Health and Safety E
4、xecutive Institution of Gas Engineers Institute of Measurement and Control The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Cable Makers Confederation British Pressure Gauge Manufacturers Association Department of Trade and Industr
5、y (National Physical Laboratory) Engineering Industries Association Institute of Materials Society of Environmental Engineers Institution of Electrical Engineers Amendments issued since publication Amd. No. Date CommentsBS EN 50212:1997 BSI 02-1999 i Contents Page Committees responsible Inside front
6、 cover National foreword ii Foreword 2 Text of EN 50212 3 List of references Inside back coverBSEN 50212:1997 ii BSI 02-1999 National foreword This British Standard has been prepared by Technical Committee GEL/65 and is the English language version of EN50212 Connectors for thermoelectric sensors, p
7、ublished by the European Committee for Electrotechnical Standardization (CENELEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itsel
8、f confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard IEC 584 series BS 4937 International thermocouple reference tables HD 446.3 S1:1993 BS 4937-30:1993 Extension and compensating cables. Tolerances and identification system Summary of pag
9、es This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on thein
10、side front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50212 May 1996 ICS 17.200.20 Descriptors: Thermoelectric sensor, compensated connectors English version Connectors for thermoelectric sensors Connecteurs pour couples thermolectriques Steckverbindungen fr Thermoelemente This Europ
11、ean Standard was approved by CENELEC on 1996-03-05. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
12、 concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member
13、 into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal
14、, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1996 Copyright reserved to CENELE
15、C members Ref. No. EN 50212:1996 EEN50212:1996 BSI 02-1999 2 Foreword This European Standard was prepared by BTWG69-2, Compensated connectors for thermoelectric sensors. The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN50212 on 1996-03-05. The f
16、ollowing dates were fixed: Contents Page Foreword 2 1 Object and scope 3 2 General 3 2.1 Connector types 3 2.2 Marking for identification and polarities 3 3 Electrical characteristics 3 3.1 Maximum allowable error when a temperature gradient is present 3 3.2 Contact quality stability test 3 3.3 Insu
17、lation resistance 4 3.4 Earth connection continuity 4 4 Dimensional characteristics 4 5 Physical characteristics 4 5.1 Housing 4 5.2 Metal parts (pin, socket contact) connected to the cables to be linked together 5 5.3 Connections 5 Figure 1 Test set up for insertion error verification 4 Figure 2 A
18、type connector with 2 pins 5 Figure 3 A type connector with 3 pins 6 Figure 4 B type connector with 2 pins 7 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1997-03-01 latest date by which the national stand
19、ards conflicting with the EN have to be withdrawn (dow) 1997-03-01EN50212:1996 BSI 02-1999 3 1 Object and scope The object of this standard is to determine composition, nature of materials, manufacturing tests and thermoelectric behaviour of connectors for sensors using thermocouples according to HD
20、446.3S1. The latter standard does not cover such special thermocouples as U, L and W types; nevertheless the user of such special thermocouples may use the connectors described hereafter with some restrictions mentioned in the relevant paragraphs. 2 General 2.1 Connector types 2.1.1 Connectors with
21、specified dimensional characteristics They are defined in this standard by their dimensional, physical, electrical and chemical characteristics. The types retained in this standard are: 2.1.2 Other connectors The electrical characteristics are identical to those defined for connectors described in3.
22、1.1. Withdrawal tests, waterproof and dustproof tests, corrosion tests, tests for resistance to heat, will be stated by the manufacturer as a list of technical characteristics. The dimensional, physical and chemical characteristics peculiar to each manufacturer are not specified. 2.2 Marking for ide
23、ntification and polarities The connectors shall comprise a permanent colour marking, e.g. either indelible superficial or mass colouring, or recessed coloured dots or coloured rings, etc. At least the positive polarity shall be indicated by permanent marking. Though not compulsory, to avoid confusio
24、n with previous markings, or markings in other standards, the thermocouple type may be also additionally indicated. 3 Electrical characteristics 3.1 Maximum allowable error when a temperature gradient is present This test is only performed as a type test and is only relevant to a plug and socket ass
25、embly. The maximum allowable errors with a temperature gradient of 40K between temperatures u 1and u 2(seeFigure 1) are stated in the following table: To measure them, the following method shall be used: a) Schematic representation Refer to Figure 1. NOTEu 2 u 1= 40 K 2 K (see subclause4.1) 0 C # u
26、1# 100C a) Results The measurements shall be made using a millivoltmeter having a metrological quality related to the error to be measured. The temperature/millivolt correspondence is stated in the relevant standard 1) . The first measurement is made by direct connection by the thermocouple. The sec
27、ond measurement is made through the connector. The insertion error is the difference between the two values noted down, one when directly connected by the thermocouple, and the other when connected through the connector. 3.2 Contact quality stability test The error shall remain within the limits sta
28、ted in subclause4.1 after250 plugging in and250 plugging out of the connector. A type: connectors with cylindrical pins and cylindrical sockets; B type: connectors with flat pins and flat sockets. Code Colour T J E K S R B N brown black violet green orange orange grey pink E J K or N R or S T B 1,5C
29、 1,5C 1,5C 0,5C 0,5C not relevant 1) IEC Publication 584.EN50212:1996 4 BSI 02-1999 3.3 Insulation resistance 3.3.1 The insulation resistance between each pin and the other(s) and between each socket and the other(s) shall be at least 10MW measured with100Vd.c., at the maximum temperature of the hou
30、sing as specified by the manufacturer. 3.3.2 The insulation resistance between each positive and negative pin or each positive and negative socket and an aluminium foil wrapping the connector housing shall be at least 10MW measured with 100Vd.c. This test may not apply to the earth pin or to the ear
31、th socket. 3.4 Earth connection continuity The earth connection continuity shall be maintained after250 plugging in and250 plugging out of the connector. 4 Dimensional characteristics The dimensional characteristics: on the one hand of A type connectors with2 or3pins; on the other hand of B type con
32、nectors with2pins, are given in the followingFigure 2, Figure 3 and Figure 4. As to B type connectors with 3pins, no dimensional characteristics are presently standardized, but such connectors shall fulfil the following prescriptions. It shall be possible to plug any B type plug with3pins, into a st
33、andardized B type socket with two socket contacts, a faulty insertion leading to a thermoelectric error being prevented. Removal of the earth-pin prior to such a plugging in is allowed. It shall be possible to plug into any B type socket with3 socket contacts, a standardized B type plug with 2pins,
34、a faulty insertion leading to a thermoelectric error being prevented. 5 Physical characteristics 5.1 Housing Maximum temperature: to be specified by the manufacturer with regard to the nature of the used materials (e.g. self-hardening, reinforced self-hardening, fibreglass, .). Brinell hardness: to
35、be specified by the manufacturer. NOTEThe Brinell hardness shall be sufficient to prevent a faulty insertion which may result in a polarity inversion. Connector plug in/plug out effort 2 pin A type: minimum 10N maximum 60N as well for plugging in as for plugging out. 3 pin A type: minimum 10N maximu
36、m 70N as well for plugging in as for plugging out. 2 and 3 pin B type: minimum 10N maximum40N as well for plugging in as for plugging out. Figure 1 Test set up for insertion error verificationEN50212:1996 BSI 02-1999 5 5.2 Metal parts (pin, socket contact) connected to the cables to be linked togeth
37、er The materials of these metal parts are determined with respect to the types of thermocouples in use. NOTEFor U and L type thermocouples, T or J type connectors may be used provided that the maximum temperature of the housing stays below 100C. 5.3 Connections B type connectors shall be equipped wi
38、th a device such that the positive and negative cables to be connected are clamped between two metallic flat parts prevented from rotating one with relation to the other. Thermocouples Materials + T J E K S R B N copper iron nickel-chromium nickel-chromium copper copper copper nickel-chromium- silic
39、on copper nickel copper nickel copper nickel nickel alloy copper alloy copper alloy copper nickel- silicon Figure 2 A type connector with 2 pinsEN50212:1996 6 BSI 02-1999 NOTEThe earthing pin shall be the one represented on top of the drawing farther off from the negative pin provided with a groove.
40、 Figure 3 A type connector with 3 pinsEN50212:1996 BSI 02-1999 7 Figure 4 B type connector with 2 pins8 blankBS EN 50212:1997 BSI 02-1999 List of references See national foreword.BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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