IEC 62460:2008

Temperature - Electromotive force (EMF) tables for pure-element thermocouple combinations

IEC 62460:2008 specifies the equations and reference tables relating temperature to EMF (electro-motive force) for Gold versus Platinum and Platinum versus Palladium thermocouples. For information and convenience of use it also provides the approximate equations for temperature as functions of EMF.

Tableaux température - Force électromotrice (F.É.M.) pour les combinaisons de couples thermoélectriques à éléments purs

La CEI 62460:2008 spécifie les équations et les tableaux de référence donnant la relation entre la température et la f.é.m. (force électromotrice) pour les couples thermoélectriques Or/Platine et Platine/Palladium. Pour information et facilité d'usage, les équations approchées donnant la température en fonction de la f.é.m. sont aussi données.

General Information

• Status: Published
• Publication Date: 20-Jul-2008
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.200.20 - Temperature-measuring instruments
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: SC 65B - Measurement and control devices
• Drafting Committee: WG 5 - TC 65/SC 65B/WG 5
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jul-2008
• Completion Date: 21-Jul-2008

Standards Content (Sample)

IEC 62460
Edition 1.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Temperature – Electromotive force (EMF) tables for pure-element thermocouple
combinations
Tableaux température – Force électromotrice (F.É.M.) pour les combinaisons de
couples thermoélectriques à éléments purs

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IEC 62460
Edition 1.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Temperature – Electromotive force (EMF) tables for pure-element thermocouple
combinations
Tableaux température – Force électromotrice (F.É.M.) pour les combinaisons de
couples thermoélectriques à éléments purs

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 17.200.20; 25.040.40 ISBN 2-8318-9852-8
– 2 – 62460 © IEC:2008
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references .5
3 Terms and definitions .5
4 Information on tables and equations .6
5 Tables for Gold versus Platinum thermocouples .7
5.1 Gold versus Platinum: EMF at intervals of 1 °C .7
5.2 Gold versus Platinum: Temperature at intervals of 10 μV .10
5.3 Thermoelectric values at the defining fixed points of the ITS-90 for Au/Pt
thermocouples (informative) .14
6 Tables for Platinum versus Palladium thermocouples .15
6.1 Platinum versus Palladium: EMF at intervals of 1 °C .15
6.2 Platinum versus Palladium: Temperature at intervals of 10 μV .19
6.3 Thermoelectric values at the defining fixed points of the ITS-90 for Pt/Pd
thermocouples (informative) .25
Annex A Gold versus Platinum coefficients .26
Annex B Platinum versus Palladium Coefficients .28

62460 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEMPERATURE – ELECTROMOTIVE FORCE (EMF) TABLES FOR
PURE-ELEMENT THERMOCOUPLE COMBINATIONS

FOREWORD
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International Standard IEC 62460 has been prepared by subcommittee 65B: Devices and
process analysis, of IEC technical committee 65: Industrial-process measurement, control and
automation.
The text of this standard is based on the following documents:
FDIS Report on voting
65B/665/FDIS 65B/684/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.

– 4 – 62460 © IEC:2008
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the 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.
62460 © IEC:2008 – 5 –
TEMPERATURE – ELECTROMOTIVE FORCE (EMF) TABLES FOR
PURE-ELEMENT THERMOCOUPLE COMBINATIONS

1 Scope
This International Standard specifies the equations and reference tables relating temperature
to EMF (electro-motive force) for Gold versus Platinum and Platinum versus Palladium
thermocouples. For information and convenience of use it also provides the approximate
equations for temperature as functions of EMF.
The tables and equations in this standard are intended for use with thermocouples made from
elements of purity not less than 99.999 % for Platinum and Gold and of 99.99 % for
Palladium, by weight.
Tolerances on initial values of EMF versus temperature have not been established for the
thermocouples in this standard. Where required, these tolerances should be agreed between
the wire manufacturer and the user.
Temperatures in this standard are based on the International Temperature Scale of 1990
(ITS-90). They are expressed in degrees Celsius, symbol t . Values of EMF, symbol E/μV,
are given in microvolts.
This standard does not cover extension or compensating wires for use with the pure-element
thermocouples. The questions of their use shall be agreed between the manufacturer and the
user.
2 Normative references
The 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, Thermocouples – Reference tables
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60584-1 apply, as
well as the following.
3.1
thermocouple types
the following thermocouple wire types are covered by this standard:
• Gold versus Platinum (Au/Pt or Gold/Platinum)
• Platinum versus Palladium (Pt/Pd or Platinum/Palladium)
Following international convention, as in IEC 60584-1, when identifying thermocouples the
positive element/wire is given first.

– 6 – 62460 © IEC:2008
3.2 thermoelectric values at the ITS-90 fixed points
values are given for the defining triple points (TP), melting points (MP) and freezing points
(FP) in the temperature range of the corresponding tables. The Seebeck coefficient S is the
first derivative of the EMF with respect to temperature.
4 Information on tables and equations
The following tables are included in this standard:
• Gold versus Platinum: EMF at intervals of 1 °C
• Gold versus Platinum: temperatures at intervals of 10μV
• Gold versus Platinum: thermoelectric values at the fixed points of the ITS-90
• Platinum versus Palladium: EMF at intervals of 1 °C
• Platinum versus Palladium: temperatures at intervals of 10μV
• Platinum versus Palladium: thermoelectric values at the fixed points of the ITS-90
For the tables in this document, the reference temperature is 0 °C.
/°C, which are used to
The definitive equations of EMF, E/μV, as functions of temperature, t
generate the tables, are given in Annex A for Gold/Pl
...