EN 60751:2008

Industrial platinum resistance thermometers and platinum temperature sensors

IEC 60751:2008 specifies the requirements and temperature/resistance relationship for industrial platinum resistance temperature sensors later referred to as 'platinum resistors' or 'resistors' and industrial platinum resistance thermometers later referred to as 'thermometers' whose electrical resistance is a defined function of temperature. Values of temperature in this standard are in terms of the International Temperature Scale of 1990, ITS-90. Temperatures in degrees Celsius are denoted by the symbol t, except in Table 1 where the full nomenclature t90/°C is used. The standard covers resistors or thermometers for all or part of the temperature range 200 °C to +850 °C with different tolerance classes, which may cover restricted temperature ranges. This second edition cancels and replaces the first edition published in 1983, amendment 1 (1986) and amendment 2 (1995). It constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows: While the temperature/resistance relationship in 4.2 remains unchanged, there are several changes in the other chapters. Most important are: tolerance classes follow a new scheme; tolerance acceptance test is included; hysteresis test is included; several changes in the individual tests; appendices are deleted.

Industrielle Platin-Widerstandsthermometer und Platin-Temperatursensoren

Thermomètres à résistance de platine industriels et capteurs thermométriques en platine

La CEI 60751:2008 spécifie les exigences et la relation température/résistance pour les capteurs à résistance de platine industriels, dénommés ci-après 'résistances de platine' ou 'résistances', et les thermomètres à résistance de platine industriels, dénommés ci-après 'thermomètres', dont la résistance électrique est une fonction définie de la température. Les valeurs de température données dans la présente norme sont exprimées en accord avec l'Echelle Internationale de Température de 1990, EIT-90, en degrés Celsius, et par le symbole t, à l'exception du Tableau 1 où l'expression t90/°C est utilisée. Elle couvre les résistances ou thermomètres pour toutes les parties de la gamme -200 °C à +850 °C avec différentes classes de tolérance, qui peuvent couvrir des domaines de températures limités. Cette deuxième édition annule et remplace la première édition parue en 1983, l'amendement1 (1986) et l'amendement 2 (1995). Cette édition constitue une révision technique. Par rapport à l'édition précédente, les modifications techniques majeures sont les suivantes: Alors que la relation entre la température et la résistance, donnée en 4.2 est inchangée, plusieurs modifications sont apportées dans les autres chapitres. Les plus importants sont: les classes de tolérance suivent un nouveau système; un essai d'acceptation de la tolérance est inclus; un essai d'hystérésis est inclus; plusieurs modifications sont apportées dans les essais individuels; des appendices sont supprimés.

Industrijski uporovni termometri in temperaturni senzorji iz platine (IEC 60751:2008 (EQV))

General Information

• Status: Withdrawn
• Publication Date: 18-Sep-2008
• Withdrawal Date: 31-Jul-2011
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: CLC/TC 65X - Industrial-process measurement, control and automation
• Drafting Committee: IEC/SC 65B - IEC_SC_65B
• Parallel Committee: IEC/SC 65B - IEC_SC_65B
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 03-Mar-2025
• Completion Date: 03-Mar-2025
• Ref Project: SIST EN 60751:2009 - Industrial platinum resistance thermometers and platinum temperature sensors

Relations

• Replaces: EN 60751:1995/A2:1995 - Industrial platinum resistance thermometer sensors
• Effective Date: 28-Jan-2023
• Replaces: EN 60751:1995 - Industrial platinum resistance thermometer sensors
• Effective Date: 28-Jan-2023
• Replaced By: EN IEC 60751:2022 - Industrial platinum resistance thermometers and platinum temperature sensors
• Effective Date: 01-Jan-2019

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2009
1DGRPHãþD
SIST EN 60751:1998
SIST EN 60751:1998/A2:1998
Industrijski uporovni termometri in temperaturni senzorji iz platine (IEC
60751:2008 (EQV))
Industrial platinum resistance thermometers and platinum temperature sensors
Industrielle Platin-Widerstandsthermometer und Platin-Sensoren
Thermomètres à résistance de platine industriels et capteurs thermométriques en platine
Ta slovenski standard je istoveten z: EN 60751:2008
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60751
NORME EUROPÉENNE
September 2008
EUROPÄISCHE NORM
ICS 17.200.20 Supersedes EN 60751:1995 + A2:1995

English version
Industrial platinum resistance thermometers
and platinum temperature sensors
(IEC 60751:2008)
Thermomètres à résistance  Industrielle
de platine industriels Platin-Widerstandsthermometer
et capteurs thermométriques en platine und Platin-Sensoren
(CEI 60751:2008) (IEC 60751:2008)

This European Standard was approved by CENELEC on 2008-08-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60751:2008 E
Foreword
The text of document 65B/664/FDIS, future edition 2 of IEC 60751, prepared by SC 65B, Devices &
process analysis, of IEC TC 65, Industrial-process measurement, control and automation, was submitted
to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60751 on 2008-08-01.
This European Standard supersedes EN 60751:1995 + A2:1995.
The significant technical changes with respect to EN 60751:1995 are as follows:
While the temperature/resistance relationship in 4.2 remains unchanged, there are several changes in the
other chapters. Most important are:
– tolerance classes follow a new scheme;
– tolerance acceptance test is included;
– hysteresis test is included;
– several changes in the individual tests;
– appendices are deleted.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2011-08-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60751:2008 was approved by CENELEC as a European
Standard without any modification.
__________
– 3 – EN 60751:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 61152 - Dimensions of metal-sheathed thermometer EN 61152 1994
(mod) elements
1) 2)
IEC 61298-1 - Process measurement and control devices - EN 61298-1 1995
General methods and procedures for
evaluating performance -
Part 1: General considerations

1)
Undated reference.
2)
Valid edition at date of issue.

IEC 60751
Edition 2.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Industrial platinum resistance thermometers and platinum temperature sensors

Thermomètres à résistance de platine industriels et capteurs thermométriques
en platine
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 17.200.20 ISBN 2-8318-9849-8
– 2 – 60751 © IEC:2008
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Characteristics .8
4.1 Temperature/resistance relationships .8
4.2 Resistance values .9
5 General requirements .12
5.1 Tolerance classes .12
5.1.1 Temperature range of validity .12
5.1.2 Resistors .12
5.1.3 Thermometers .12
5.1.4 Special tolerance classes and special temperature ranges of validity .12
5.2 Measuring current .13
5.3 Electrical supply .13
5.4 Connecting wire configuration .13
6 Tests .14
6.1 General .14
6.1.1 Routine production tests.14
6.1.2 Type tests .14
6.1.3 Additional type tests .14
6.2 Routine production tests for resistors .14
6.2.1 Tolerance acceptance test.14
6.3 Routine production tests for thermometers .15
6.3.1 Insulation resistance at ambient temperature.15
6.3.2 Sheath integrity test .15
6.3.3 Dimensional test.16
6.3.4 Tolerance acceptance test.16
6.4 Type tests for resistors.16
6.4.1 Tolerances .16
6.4.2 Stability at upper temperature limit .16
6.4.3 Self-heating.16
6.5 Type tests for thermometers.16
6.5.1 Insulation resistance at elevated temperatures .16
6.5.2 Thermal response time .18
6.5.3 Stability at upper temperature limit .18
6.5.4 Thermoelectric effect .18
6.5.5 Effect of temperature cycling .18
6.5.6 Effect of hysteresis .18
6.5.7 Self-heating.18
6.5.8 Minimum immersion depth .19
6.6 Additional type tests for special applications of thermometers .19
6.6.1 Capacitance .19
6.6.2 Inductance.19
6.6.3 Dielectric strength .19
6.6.4 Vibration test .19

60751 © IEC:2008 – 3 –
6.6.5 Drop test .19
6.7 Summary of tests .19
7 Information to be made available by the manufacturer.20
7.1 For resistors only .20
7.2 For resistors and/or thermometers.20
8 Thermometer identification and marking .20

Figure 1 – Connecting configurations.13
Figure 2 – Examples of test results for selecting or rejecting resistors. .15

Table 1 – Temperature/resistance relationship, R = 100.00 Ω .10
Table 2 – Tolerance classes for resistors.12
Table 3 – Tolerance classes for thermometers.12
Table 4 – Minimum insulation resistance of thermometers at maximum temperature.16
Table 5 – Table of tests described in this standard .20

– 4 – 60751 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INDUSTRIAL PLATINUM RESISTANCE THERMOMETERS AND
PLATINUM TEMPERATURE SENSORS
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
Committees in that sense. While all reasonable efforts are made to 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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between 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 rendered responsible for any
equipment 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 of 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
expenses 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 60751 has been prepared by subcommittee 65B: Devices and
process analysis, of IEC technical committee 65: Industrial-process measurement, control and
automation.
This second edition cancels and replaces the first edition published in 1983, amendment 1
(1986) and amendment 2 (1995). This edition constitutes a technical revision.
The significant technical changes with respect to the previous edition are as follows:
While the temperature/resistance relationship in 4.2 remains unchanged, there are several
changes in the other chapters. Most important are:
– tolerance classes follow a new scheme;
– tolerance acceptance test is included;
– hysteresis test is included;
– several changes in the individual tests;
– appendices are deleted.
60751 © IEC:2008 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
65B/664/FDIS 65B/683/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 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.
– 6 – 60751 © IEC:2008
INDUSTRIAL PLATINUM RESISTANCE THERMOMETERS AND
PLATINUM TEMPERATURE SENSORS
1 Scope
This standard specifies the requirements and temperature/resistance relationship for
industrial platinum resistance temperature sensors later referred to as “platinum resistors” or
"resistors" and industrial platinum resistance thermometers later referred to as
"thermometers" whose electrical resistance is a defined function of temperature.
The International Standard applies to platinum resistors whose temperature coefficient α,
defined as
R − R
100 0
α =
R ⋅100°C
–3 –1
is conventionally written as α = 3.851 x 10 °C , where R is the resistance at t = 100 °C
and R is the resistance at t = 0 °C.
Values of temperature in this standard are in terms of the International Temperature Scale of
1990, ITS-90. Temperatures in degrees Celsius are denoted by the symbol t, except in
Table 1 where the full nomenclature t /°C is used.
The standard covers resistors or thermometers for all or part of the temperature range
-200 °C to +850 °C with different tolerance classes, which may cover restricted temperature
ranges.
For temperature/resistance relationships with uncertainties <0,1 °C, which are possible only
for resistors or thermometers with exceptionally high stability and individual calibration, a
more complex interpolation equation than is presented in this standard may be necessary.
The specification of such equations is outside the scope of this standard.
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 61152, Dimensions of metal-sheathed thermometer elements
IEC 61298-1, Process Measurement and Control devices – General Methods and Procedures
for Evaluating Performance – Part 1: General considerations
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
dielectric strength
maximum voltage between all parts of the electric circuit and the sheath of the thermometer
or, in the case of a thermometer with two or more sensing circuits, between two individual

60751 © IEC:2008 – 7 –
circuits which the thermometer can withstand without damage. The measurement conditions
for d.c and a.c (with frequency) have to be specified.
3.2
insulation resistance
electrical resistance measured between any part of the electric circuit and the sheath at
ambient or elevated temperatures and with a specified measuring voltage (a.c or d.c)
3.3
minimum immersion depth
immersion depth at which the change from the calibration at full immersion does not exceed
0.1 °C
3.4
nominal resistance
expected resistance R of a resistor or resistance thermometer at 0 °C, declared by the
manufacturer and shown in the thermometer marking, usually rounded to the nearest ohm.
Platinum resistors are often characterized by their nominal: A Pt-100 resistor is a resistor with
R = 100 Ω
3.5
platinum resistance thermometer
PRT
temperature responsive device consisting of one or more sensing platinum resistors within a
protective sheath, internal connecting wires and external terminals to permit connection of
electrical measurement instruments. Mounting means and connection heads may be included.
Not included is any separable protection tube or thermowell
3.6
temperature sensitive length
length of the thermometer whose temperature directly influences the resistance measured.
Usually the temperature sensitive length is related to the length of the resistor
3.7
platinum resistor
resistor made from a platinum wire or film with defined electrical characteristics, embedded in
an insulator (in most cases glass or ceramic), designed to be assembled into a resistance
thermometer or into an integrated circuit
3.8
self-heating
increase of the temperature of the resistor or of the resistor in a thermometer caused by the
dissipated energy of the measuring current
3.9
self-heating coefficient
coefficient with the dimension °C/mW is characteristic for a resistor/thermometer and
describes the temperature increase of the resistor per unit power dissipated. This coefficient
is evaluated under specified operating conditions of the resistor or thermometer. The medium,
its flow conditions and temperature should be specified
3.10
terminals
termination of the connections supplied with the resistance thermometer
NOTE Typical types of terminals are:
− screws or clamps on the terminal socket;

– 8 – 60751 © IEC:2008
− pins of fixed connectors;
− open ends of fixed cables, or equivalents.
3.11
thermal response time
time a thermometer takes to respond at a specified percentage to a step change in
temperature. To specify the response time, it is necessary to declare the percentage of
response, usually τ , τ , or τ , which gives the time for 90 %, 50 % or 10 % of the
0.9 0.5 0.1
response. The test medium and its flow conditions have to be specified (usually flowing water
and/or flowing air)
3.12
thermoelectric effect
effect of inducing the electro-motive force (EMF) caused by different metals used in the
electric circuit of the thermometer and by thermoelectric inhomogeneity of the internal leads
at the conditions of temperature gradients along the leads. The induced EMF is measured
across the terminals of the thermometer while the thermometer is subjected to a specified
temperature
3.13
tolerance
initial maximum allowable deviation expressed as Δt(t) in °C from the nominal
temperature/resistance relationship R(t)
3.14
hysteresis
property of a device or instrument whereby it gives different output values in relation to its
input values depending on the directional sequence in which the input values have been
applied
[IEC 61298-1, 3.13]
NOTE Hysteresis as defined in IEC 61298-1 can be applied to thermometers by the method described in 6.5.6 of
this standard
4 Characteristics
The temperature/resistance relationships and tolerances in this chapter are valid for the
sensing resistors at its connecting points. For thermometers, they are valid for the complete
thermometer at its terminals.
In the case of two-wire connections, the resistance values of the leads between the
connecting point of the resistor and the terminals shall be considered. They may be indicated
on the thermometer and shall be subtracted from measured resistances. In some cases, it
also may be advisable to consider the temperature coefficient of the lead wires, the
geometrical characteristics of the wires and the temperature distribution along their length.
4.1 Temperature/resistance relationships
The temperature/resistance relationships used in this standard are as follows:
For the range –200 °C to 0 °C:
2 3
R = R [1 + At + Bt + C(t - 100°C) t ]
t 0
For the range of 0 °C to 850 °C:
—————————
First calibration before any use of the resistor or thermometer.

60751 © IEC:2008 – 9 –
R = R (1 + At + Bt )
t 0
where
R is the resistance at the temperature t;
t
R is the resistance at t = 0 °C.
The constants in these equations are:
–3 –1
A = 3.9083 × 10 °C
–7 –2
B = −5.775 × 10 °C
–12 –4
C = −4.183 × 10 °C
These equations and coefficients have been used to derive the table of resistance values,
Table 1, for a platinum resistor of nominal resistance R = 100 Ω .
4.2 Resistance values
The temperature/resistance relationship in Table 1 is given for a resistor with nominal
resistance of 100 Ω. For other nominal resistances R such as; 10 Ω, 500 Ω or 1 000 Ω, the
0,
table can be used by multiplying the table values with the factor R /100 Ω.
– 10 – 60751 © IEC:2008
Table 1 – Temperature/resistance relationship, R = 100.00 Ω
t /°C Resistance at the temperature t /°C t /°C
90 90 90
Ω
0 -1 -2 -3 -4 -5 -6 -7 -8 -9
-200 18.52     -200
-190 22.83 22.40 21.97 21.54 21.11 20.68 20.25 19.82 19.38 18.95 -190
-180 27.10 26.67 26.24 25.82 25.39 24.97 24.54 24.11 23.68 23.25 -180
-170 31.34 30.91 30.49 30.07 29.64 29.22 28.80 28.37 27.95 27.52 -170
-160 35.54 35.12 34.70 34.28 33.86 33.44 33.02 32.60 32.18 31.76 -160
-150 39.72 39.31 38.89 38.47 38.05 37.64 37.22 36.80 36.38 35.96 -150
-140 43.88 43.46 43.05 42.63 42.22 41.80 41.39 40.97 40.56 40.14 -140
-130 48.00 47.59 47.18 46.77 46.36 45.94 45.53 45.12 44.70 44.29 -130
-120 52.11 51.70 51.29 50.88 50.47 50.06 49.65 49.24 48.83 48.42 -120
-110 56.19 55.79 55.38 54.97 54.56 54.15 53.75 53.34 52.93 52.52 -110
-100 60.26 59.85 59.44 59.04 58.63 58.23 57.82 57.41 57.01 56.60 -100

-90 64.30 63.90 63.49 63.09 62.68 62.28 61.88 61.47 61.07 60.66 -90
-80 68.33 67.92 67.52 67.12 66.72 66.31 65.91 65.51 65.11 64.70 -80
-70 72.33 71.93 71.53 71.13 70.73 70.33 69.93 69.53 69.13 68.73 -70
-60 76.33 75.93 75.53 75.13 74.73 74.33 73.93 73.53 73.
...