Mineral insulated metal-sheathed thermocouple cables and thermocouples

IEC 61515:2016 establishes the requirements for simplex, duplex and triplex mineral-insulated metal-sheathed thermocouple cables and thermocouples, which are intended for use in general industrial applications. The abbreviation MIMS (for "mineral-insulated metal-sheathed") will be used hereafter. It covers thermocouple cables and thermocouples with only base-metal conductors of Types T, J, E, K and N. The specifications in this standard apply to new thermocouple cables and thermocouple units as delivered to the user. They do not apply to the product after use. This second edition cancels and replaces the first edition published in 1995. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Duplex and triplex are standardized.
- Specification of insulation resistance is revised so that the user can choose the best product to fit for the purpose.
- "Table 2 Recommended maximum operating temperatures" in the previous version is expanded significantly including newly developed sheath material and it is moved to Annex C.
- Test items and their methods are expanded and a guide table (Table 4) is added for userfriendliness.

Câbles et couples thermoélectriques à isolation minérale dits "chemisés"

L'IEC 61515:2016 établit les exigences relatives aux câbles et couples thermoélectriques à isolation minérale dits "chemisés" de types simplex, duplex et triplex, qui sont destinés à des applications industrielles générales. L'abréviation MIMS (Mineral Insulated Metal-Sheathed) sera utilisée ci-après. Elle concerne les câbles et couples thermoélectriques à conducteurs à base de métaux usuels de types T, J, E, K et N uniquement. Les spécifications définies dans la présente norme s'appliquent aux câbles et ensembles de couples thermoélectriques neufs livrés à l'utilisateur. Elles ne s'appliquent pas au produit usagé. Cette deuxième édition annule et remplace la première édition parue en 1995. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Les types duplex et triplex ont été normalisés.
- La spécification de la résistance d'isolement a été révisée pour permettre à l'utilisateur de choisir le produit le mieux adapté à l'emploi.
- Le Tableau 2 "Températures de fonctionnement maximales recommandées" de la version précédente a été considérablement développé et couvre notamment les matériaux de gainage nouvellement développés. Il a été déplacé à l'Annexe C.
- Les types d'essai et leurs méthodes ont été développés, et un tableau indicatif (Tableau 4) a été ajouté pour faciliter la compréhension de l'utilisateur.

General Information

Status
Published
Publication Date
26-Apr-2016
Current Stage
PPUB - Publication issued
Start Date
27-Apr-2016
Completion Date
27-Apr-2016
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IEC 61515
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mineral insulated metal-sheathed thermocouple cables and thermocouples
Câbles et couples thermoélectriques à isolation minérale dits "chemisés"
IEC 61515:2016-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61515
Edition 2.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Mineral insulated metal-sheathed thermocouple cables and thermocouples
Câbles et couples thermoélectriques à isolation minérale dits "chemisés"
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.200.20 ISBN 978-2-8322-3225-5

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61515:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 4

INTRODUCTION ................................................................................................................... 6

1 Scope ............................................................................................................................ 7

2 Normative references..................................................................................................... 7

3 Terms and definitions .................................................................................................... 7

4 General principles ......................................................................................................... 8

4.1 A MIMS thermocouple ........................................................................................... 8

4.2 Electromotive force ............................................................................................... 9

4.3 Materials and their properties ................................................................................ 9

4.3.1 Sheath ........................................................................................................... 9

4.3.2 Conductors .................................................................................................... 9

4.3.3 Insulation materials ........................................................................................ 9

4.4 Maximum operating temperature ............................................................................ 9

4.5 Dimensions ........................................................................................................... 9

4.5.1 Transverse section of MIMS thermocouple cables and thermocouples ............. 9

4.5.2 Transverse section of simplex cable and thermocouple ................................. 10

4.5.3 Transverse section of duplex cable and thermocouple .................................. 11

4.5.4 Transverse section of triplex cable and thermocouple ................................... 12

5 Requirements and verification tests .............................................................................. 12

5.1 General ............................................................................................................... 12

5.2 MIMS thermocouple cables: requirements and verification tests ........................... 13

5.2.1 Structure and mechanical properties ............................................................. 13

5.2.2 Electrical characteristics and performance .................................................... 14

5.3 MIMS thermocouples: requirements and verification tests .................................... 16

5.3.1 Structure and mechanical properties ............................................................. 16

5.3.2 Electrical characteristics and performance .................................................... 18

6 Delivery condition for thermocouple cables ................................................................... 20

7 Packaging ................................................................................................................... 20

8 Marking ....................................................................................................................... 20

9 Certification ................................................................................................................. 20

Annex A (informative) Alternative adjacent conductor configurations .................................. 21

A.1 General ............................................................................................................... 21

A.2 Duplex cable and thermocouple ........................................................................... 21

A.3 Triplex cable and thermocouple ........................................................................... 21

Annex B (informative) Mineral insulation material chemical composition ............................. 24

Annex C (informative) Indicative upper temperature limits .................................................. 25

Figure 1 – Transverse section of simplex ............................................................................. 10

Figure 2 – Transverse section of duplex .............................................................................. 11

Figure 3 – Transverse section of triplex ............................................................................... 12

Figure 4 – Longitudinal section of a grounded junction ......................................................... 16

Figure 5 – Longitudinal section of an insulated junction ....................................................... 17

Figure A.1 – Alternative adjacent conductor configuration for duplex .................................... 21

Figure A.2 – Alternative adjacent conductor configuration for triplex (1) ............................... 22

---------------------- Page: 4 ----------------------
IEC 61515:2016 © IEC 2016 – 3 –

Figure A.3 – Alternative adjacent conductor configuration for triplex (2) ............................... 22

Figure A.4 – Alternative adjacent conductor configuration for triplex (3) ............................... 23

Table 1 – Dimensional specifications of simplex .................................................................. 10

Table 2 – Dimensional specifications of duplex .................................................................... 11

Table 3 – Dimensional specifications of triplex..................................................................... 12

Table 4 – Tests for MIMS thermocouple cables and thermocouples ...................................... 13

Table 5 – Test voltage for dielectric strength ....................................................................... 15

Table 6 – Minimum insulation resistance at ambient temperature (MIMS cables) .................. 15

Table 7 – Insulation resistance at elevated temperatures (MIMS cables) .............................. 16

Table 8 – Minimum insulation resistance at ambient temperature ......................................... 19

Table 9 – Insulation resistance at elevated temperatures (MIMS thermocouples) .................. 19

Table B.1 – Example values of recommended magnesia (MgO) – Chemical

composition in weight percent ............................................................................................. 24

Table B.2 – Example values of recommended alumina (Al O ) – Chemical composition
2 3

in weight percent ................................................................................................................ 24

Table C.1 – Indicative temperature limits of MIMS thermocouple sheath and conductor

combinations ...................................................................................................................... 25

---------------------- Page: 5 ----------------------
– 4 – IEC 61515:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MINERAL INSULATED METAL-SHEATHED
THERMOCOUPLE CABLES AND THERMOCOUPLES
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 international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in

addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(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 organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization 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 opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

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 of its technical committees and IEC National Committees for any personal injury, property damage or

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arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

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 be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61515 has been prepared by subcommittee 65B: Measurement and

control devices, of IEC technical committee 65: Industrial-process measurement, control and

automation.

This second edition cancels and replaces the first edition published in 1995. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) Duplex and triplex are standardized.

b) Specification of insulation resistance is revised so that the user can choose the best product

to fit for the purpose.

c) “Table 2 Recommended maximum operating temperatures” in the previous version is

expanded significantly including newly developed sheath material and it is moved to

Annex C.

d) Test items and their methods are expanded and a guide table (Table 4) is added for

userfriendliness.
---------------------- Page: 6 ----------------------
IEC 61515:2016 © IEC 2016 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
65B/1034/FDIS 65B/1038/RVD

Full 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 accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until the

stability date indicated on the IEC website 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.
---------------------- Page: 7 ----------------------
– 6 – IEC 61515:2016 © IEC 2016
INTRODUCTION

This new edition of IEC 61515 reflects recent developments in production technology, sheath

materials and insulation materials. It aims to be a flexible standard allowing suppliers to provide

fit-for-purpose products at an acceptable cost.

It includes informative guidance to help users choose the products that meet their needs.

Annex A gives alternative adjacent conductor configurations for duplex and triplex MIMS

thermocouple cables and thermocouples.

Annex B gives recommendations to suppliers with respect to insulation composition.

Annex C gives guidelines to users with regard to temperature limits of operation.

---------------------- Page: 8 ----------------------
IEC 61515:2016 © IEC 2016 – 7 –
MINERAL INSULATED METAL-SHEATHED
THERMOCOUPLE CABLES AND THERMOCOUPLES
1 Scope

This International Standard establishes the requirements for simplex, duplex and triplex

mineral-insulated metal-sheathed thermocouple cables and thermocouples, which are intended

for use in general industrial applications. The abbreviation MIMS (for “mineral-insulated

metal-sheathed”) will be used hereafter. It covers thermocouple cables and thermocouples with

only base-metal conductors of Types T, J, E, K and N. The specifications in this standard apply

to new thermocouple cables and thermocouple units as delivered to the user. They do not apply

to the product after use.

External seals, terminations, connections and other accessories are not within the scope of this

International Standard.

This standard does not apply to precious metal thermocouple cables and thermocouples. The

special requirements for nuclear primary loop applications are dealt with in the other standards.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)

IEC 60584-1, Thermocouples: Part 1 – EMF specifications and tolerances

ISO 1302, Geometrical Product Specifications (GPS) — Indication of surface texture in

technical product documentation
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60584-1 and the

following apply.
3.1
mineral insulated metal-sheathed thermocouple cable

bendable cable consisting of one or more pairs of thermocouple conductors encapsulated in a

metal protecting sheath, insulated from each other and from the sheath by a compacted mineral

material

Note 1 to entry: Abbreviation MIMS for “mineral insulated metal-sheathed” is used hereafter.

3.2
MIMS thermocouple

thermocouple manufactured from mineral-insulated metal-sheathed thermocouple cable

Note 1 to entry: This note applies to the French language only.
---------------------- Page: 9 ----------------------
– 8 – IEC 61515:2016 © IEC 2016
3.3
simplex thermocouple
thermocouple unit comprising one pair of thermocouple conductors
3.4
duplex thermocouple
thermocouple unit comprising two pairs of thermocouple conductors
3.5
triplex thermocouple
thermocouple unit comprising three pairs of thermocouple conductors
3.6
measuring junction

junction of the thermocouple conductors which is subjected to the temperature to be measured

3.7
grounded junction
bonded junction
earthed junction
measuring junction electrically connected to the metal sheath
3.8
insulated junction
ungrounded junction
measuring junction electrically insulated from the metal sheath
3.9
thermal response time

time a thermocouple takes to respond at a specified percentage to a step change in temperature

Note 1 to entry: The time to register 50 % of the step change, for example, is written τ .

0,5

Note 2 to entry: The test medium and its flow conditions shall be specified (usually flowing water or flowing air).

3.10
type test

test conducted on one or more samples of the production to verify that the product is compliant

with the requirements of IEC 61515 following the introduction or change of material specification,

design or manufacturing process
3.11
routine test

test to which each individual product is subjected during or after manufacture to ascertain

whether it complies with the requirements of IEC 61515
3.12
optional test

test that is performed upon agreement between a supplier and a user to ensure compliance with

the user’s specific application
4 General principles
4.1 A MIMS thermocouple

A MIMS thermocouple specified in this standard shall be made of a MIMS thermocouple cable

that complies with this standard.
---------------------- Page: 10 ----------------------
IEC 61515:2016 © IEC 2016 – 9 –
4.2 Electromotive force

The electromotive force (abbreviated EMF hereafter) versus temperature relationship shall

comply with IEC 60584-1. The EMF tolerance, as specified in IEC 60584-1, should be agreed

between the supplier and the user.
4.3 Materials and their properties
4.3.1 Sheath

The sheath material shall be of qualified stainless steel or high nickel alloy or other metals

selected by agreement between users and suppliers. It shall be chosen to suit user’s application

in order to protect the thermocouple during use. The general surface finish of the sheath upon

delivery shall be equal to, or better than, roughness grade ISO 1302 scale 8 (3,2 µm Ra).

4.3.2 Conductors

Conductors shall be those forming thermocouple types T, J, E, K or N as specified in

IEC 60584-1.This standard applies to thermocouple cables and thermocouples that have 1, 2

and 3 pairs of thermocouple conductors.

For duplex and triplex, cables basic adjacent conductor configurations are specified. Alternative

configurations are acceptable by the agreement between supplier and user provided that all the

other requirements of this standard are met.

Some examples of alternative adjacent conductor configurations are given in Annex A.

4.3.3 Insulation materials
The mineral insulation shall consist of compacted ceramic powder.

The purity of insulating material should be at least 96 % and informative compositions are shown

in Annex B.

Specific requirements, concerning the purity of the insulation material, can be customized by

agreement between the user and the supplier.
4.4 Maximum operating temperature

Definitive maximum operating temperatures cannot be specified because of the number of

influencing factors. Instead Annex C gives indicative temperature limits which are the

recommended maximum operating temperatures for the standardized thermocouples and some

commonly used sheath materials and diameters. They are to be considered only as guidance for

users.
4.5 Dimensions
4.5.1 Transverse section of MIMS thermocouple cables and thermocouples

The outside diameter, conductor diameter and sheath wall thickness shall be as specified in the

following 4.5.2 to 4.5.4. Throughout this standard the following symbols are used.

• outside diameter D;
• conductor diameter C;
• sheath wall thickness S;
• insulation thickness I.

The insulation thickness I is not quantified in this standard. It shall be such that the specified

requirements for dielectric strength (specified in 5.2.2.3 and 5.3.2.3) and insulation resistance

---------------------- Page: 11 ----------------------
– 10 – IEC 61515:2016 © IEC 2016

(specified in 5.2.2.5 and 5.3.2.4) shall be met. (The maximum value of the insulation thickness

can be deduced from the specified value of D, S and C). Conductors shall be approximately

evenly spaced unless specified otherwise. The following Figures 1, 2 and 3, as well as

Figures A.1, A.2, A.3 and A.4 clarify which part the specifications of D, C and S are applied to.

Insulation thickness is always given in brackets in those figures because it is not numerically

specified.
4.5.2 Transverse section of simplex cable and thermocouple
( I ) ( I ) ( I )
C C
IEC
Figure 1 – Transverse section of simplex
Table 1 – Dimensional specifications of simplex
Outside diameter D Minimum sheath Minimum diameter of
and its tolerance wall thickness S conductor C
mm mm mm
0,5 ± 0,025 0,05 0,08
0,10 0,15
1,0 ± 0,025
0,15 0,23
1,5 ± 0,025
2,0 ± 0,025 0,20 0,30
3,0 ± 0,030 0,30 0,45
3,2 ± 0,032 0,32 0,48
0,40 0,60
4,0 ± 0,040
0,45 0,68
4,5 ± 0,045
4,8 ± 0,048 0,48 0,72
6,0 ± 0,060 0,60 0,90
6,4 ± 0,064 0,64 0,96
8,0 ± 0,080 0,80 1,20
0,95 1,43
9,5 ± 0,095
10,8 ± 0,108 1,08 1,62
---------------------- Page: 12 ----------------------
IEC 61515:2016 © IEC 2016 – 11 –

Sizes not included in Table 1 are acceptable provided that the sheath wall thickness is not less

than 10 % of the thermocouple cable diameter (D) and the conductor diameter (C) is not less

than 15 % of D. The tolerance on D shall be the greater of 0,025 mm or 0,01·D.
4.5.3 Transverse section of duplex cable and thermocouple
( I )
( I )
IEC
Figure 2 – Transverse section of duplex
Table 2 – Dimensional specifications of duplex
Outside diameter D Minimum sheath wall thickness S Minimum diameter of
and its tolerance conductor C
mm mm mm
0,14 0,17
1,5 ± 0,025
2,0 ± 0,025 0,18 0,22
3,0 ± 0,030 0,27 0,33
3,2 ± 0,032 0,29 0,35
4,0 ± 0,040 0,36 0,44
0,41 0,50
4,5 ± 0,045
4,8 ± 0,048 0,43 0,53
6,0 ± 0,060 0,54 0,66
6,4 ± 0,064 0,58 0,70
8,0 ± 0,080 0,72 0,88
0,86 1,05
9,5 ± 0,095
10,8 ± 0,108 0,97 1,19

Sizes not included in Table 2 are acceptable provided that sheath wall thickness is not less than

9 % of the thermocouple cable diameter (D) and conductor diameter (C) is not less than 11 % of

D. The tolerance on D, shall be the greater of 0,025 mm or 0,01·D.
---------------------- Page: 13 ----------------------
– 12 – IEC 61515:2016 © IEC 2016
4.5.4 Transverse section of triplex cable and thermocouple
C ( I ) S
( I )
IEC
Figure 3 – Transverse section of triplex
Table 3 – Dimensional specifications of triplex
Outside diameter D Minimum sheath wall thickness S Minimum diameter of
and its tolerance conductor C
mm mm mm
0,24 0,27
3,0 ± 0,030
3,2 ± 0,032 0,26 0,29
4,0 ±0,040 0,32 0,36
4,5 ± 0,045 0,36 0,41
0,38 0,43
4,8 ± 0,048
0,48 0,54
6,0 ± 0,060
6,4± 0,064 0,51 0,58
8,0 ± 0,080 0,64 0,72
9,5 ± 0,095 0,76 0,86
0,86 0,97
10,8 ± 0,108

Sizes not included in the Table 3 are acceptable provided that sheath wall thickness is not less

than 8 % of the thermocouple cable diameter (D) and conductor diameter (C) is not less than 9 %

of D. The tolerance on D shall be 0,01·D.
5 Requirements and verification tests
5.1 General

Tests are divided into three categories, type tests, routine tests and optional tests. The type

tests and the routine tests are mandatory. Therefore suppliers shall keep the record of the test

result which shall be provided to users upon request. Optional tests are not required unless they

---------------------- Page: 14 ----------------------
IEC 61515:2016 © IEC 2016 – 13 –
...

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