Bsi bs en 50212 1997 (1999)

00966260 PDF 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 20 BS EN 50212 1997 This Britis[.]

BRITISH STANDARD BS EN

50212:1997

Connectors for

thermoelectric sensors

The European Standard EN 50212:1996 has the status of a

British Standard

ICS 17.200.20

This British Standard, having

been prepared under the

direction of the Electrotechnical

Sector Board, was published

under the authority 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 British 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 Executive 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 Industry (National Physical Laboratory) Engineering Industries Association

Institute of Materials Society of Environmental Engineers Institution of Electrical Engineers

Amendments issued since publication

BS EN 50212:1997

Contents

Page

ii © BSI 02-1999

National foreword

This British Standard has been prepared by Technical Committee GEL/65 and is

the English language version of EN 50212 Connectors for thermoelectric sensors,

published 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 itself 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 pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN 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 the inside front cover

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 50212

May 1996

ICS 17.200.20

Descriptors: Thermoelectric sensor, compensated connectors

English version

Connectors for thermoelectric sensors

Connecteurs pour couples thermoélectriques Steckverbindungen für Thermoelemente

This European 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 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 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, Spain, Sweden, Switzerland and

United Kingdom

CENELEC

European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B-1050 Brussels

© 1996 Copyright reserved to CENELEC members

Ref No EN 50212:1996 E

© BSI 02-1999 2

Foreword

This European Standard was prepared by

BTWG 69-2, Compensated connectors for

thermoelectric sensors

The text of the draft was submitted to the Unique

Acceptance Procedure and was approved by

CENELEC as EN 50212 on 1996-03-05

The following dates were fixed:

Contents

Page

2.2 Marking for identification and

3.1 Maximum allowable error when a

5.2 Metal parts (pin, socket contact) connected to the cables to be linked

Figure 1 — Test set up for insertion error

Figure 2 — A 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

— latest date by which the

national standards

conflicting with the EN

have to be withdrawn (dow) 1997-03-01

EN 50212:1996

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 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 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 in 3.1.1

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 identification 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 confusion 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 assembly The maximum allowable errors with a temperature gradient of 40 K between temperatures u1 and u2 (see Figure 1) are stated in the following table:

To measure them, the following method shall be used:

a) Schematic representation

Refer to Figure 1

NOTE u2 – u1 = 40 K ± 2 K (see subclause 4.1)

0 °C # u1 # 100 °C

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 standard1)

— The first measurement is made by direct connection by the thermocouple

— The second 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 stated in

subclause 4.1 after 250 plugging in and 250

plugging out of the connector

— A type: connectors with cylindrical pins and

cylindrical sockets;

— B type: connectors with flat pins and flat

sockets

T J E K S R B N

brown black violet green orange orange grey pink

± 1,5 °C ± 1,5 °C ± 1,5 °C ± 0,5 °C ± 0,5 °C not

relevant

1) IEC Publication 584.

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 10 MW measured

with 100 V d.c., at the maximum temperature of the

housing 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 10 MW measured

with 100 V d.c This test may not apply to the earth

pin or to the earth socket

3.4 Earth connection continuity

The earth connection continuity shall be maintained

after 250 plugging in and 250 plugging out of the

connector

4 Dimensional characteristics

The dimensional characteristics:

— on the one hand of A type connectors with 2

or 3 pins;

— on the other hand of B type connectors

with 2 pins, are given in the following Figure 2,

Figure 3 and Figure 4

As to B type connectors with 3 pins, no dimensional

characteristics are presently standardized, but such

connectors shall fulfil the following prescriptions

— It shall be possible to plug any B type plug with 3 pins, into a standardized 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 with 3 socket contacts, a standardized B type plug with 2 pins, 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 be specified by the manufacturer

NOTE The 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 10 N — maximum 60 N

as well for plugging in as for plugging out

— 3 pin A type: minimum 10 N — maximum 70 N

as well for plugging in as for plugging out

— 2 and 3 pin B type:

minimum 10 N — maximum 40 N as well for plugging in as for plugging out

Figure 1 — Test set up for insertion error verification

EN 50212:1996

5.2 Metal parts (pin, socket contact) connected

to the cables to be linked together

The materials of these metal parts are determined

with respect to the types of thermocouples in use

NOTE For U and L type thermocouples, T or J type connectors may be used provided that the maximum temperature of the housing stays below 100 °C.

5.3 Connections

B type connectors shall be equipped with 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-silicon

copper nickel copper nickel copper nickel nickel alloy copper alloy copper alloy copper nickel-silicon

Figure 2 — A type connector with 2 pins

6 © BSI 02-1999 NOTE The earthing pin shall be the one represented on top of the drawing farther off from the negative pin provided with a groove.

Figure 3 — A type connector with 3 pins

EN 50212:1996

Figure 4 — B type connector with 2 pins

BS EN 50212:1997

© BSI 02-1999

List of references

See national foreword

389 Chiswick High Road

London

W4 4AL

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