SIST EN 62798:2015

SLOVENSKI STANDARD
SIST EN 62798:2015
01-junij-2015
2SUHPD]DLQGXVWULMVNRHOHNWULþQRRJUHYDQMH3UHVNXVQHPHWRGH]DLQIUDUGHþH
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Industrial electroheating equipment - Test methods for infrared emitters
Ta slovenski standard je istoveten z: EN 62798:2014
ICS:
25.180.10 (OHNWULþQHSHþL Electric furnaces
SIST EN 62798:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62798:2015

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SIST EN 62798:2015


EUROPEAN STANDARD EN 62798

NORME EUROPÉENNE

EUROPÄISCHE NORM
October 2014
ICS 25.180.10

English Version
Industrial electroheating equipment -
Test methods for infrared emitters
(IEC 62798:2014)
Chauffage électrique industriel - Méthodes d'essais des Industrielle Elektrowärmeeinrichtungen - Prüfverfahren für
émetteurs de rayonnement infrarouge Infrarotstrahler
(CEI 62798:2014) (IEC 62798:2014)
This European Standard was approved by CENELEC on 2014-09-29. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 62798:2014 E

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SIST EN 62798:2015
EN 62798:2014 - 2 -
Foreword
The text of document 27/938/CDV, future edition 1 of IEC 62798, prepared by IEC/TC 27 "Industrial
electroheating and electromagnetic processing" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN 62798:2014.

The following dates are fixed:
(dop) 2015-06-29
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2017-09-29
standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 62798:2014 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60519-1:2010 NOTE Harmonized as EN 60519-1:2011 (not modified).
IEC 62471:2006 NOTE Harmonized as EN 62471:2008 (modified).
IEC 60079-0 NOTE Harmonized as EN 60079-0.

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SIST EN 62798:2015
- 3 - EN 62798:2014
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu

Publication Year Title EN/HD Year

 Methods of test for dense shaped EN 993-11
refractory products -
Part 11: Determination of resistance to
thermal shock
IEC 60061-1 -  Lamp caps and holders together with EN 60061-1 -
gauges for the control of interchangeability
and safety -
Part 1: Lamp caps
IEC 60061-2 -  Lamp caps and holders together with EN 60061-2 -
gauges for the control of interchangeability
and safety -
Part 2: Lampholders
IEC 60061-3 -  Lamp caps and holders together with EN 60061-3 -
gauges for the control of interchangeability
and safety -
Part 3: Gauges
IEC 60068-2-6 -  Environmental testing - EN 60068-2-6 -
Part 2-6: Tests - Test Fc: Vibration
(sinusoidal)
IEC 60068-2-7 -  Basic environmental testing procedures - EN 60068-2-7 -
Part 2-7: Tests - Test Ga and guidance:
Acceleration, steady state
IEC 60432-1 (mod) 1999 Incandescent lamps - Safety EN 60432-1 2000
specifications -
+A1 2005 +A1 2005
Part 1: Tungsten filament lamps for
+A2 2011 +A2 2012
domestic and similar general lighting
purposes
IEC 60519-12 -  Safety in electroheating installations - EN 60519-12 -
Part 12: Particular requirements for
infrared electroheating installations
IEC 60682 1980 Standard method of measuring the pinch EN 60682 1993
temperature of quartz-tungstenhalogen
+A1 1987
lamps
+A2 1997 +A2 1997
IEC 62693 2013 Industrial electroheating installations - EN 62693 2013
Test methods for infrared electroheating
installations

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SIST EN 62798:2015

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SIST EN 62798:2015



IEC 62798

®


Edition 1.0 2014-08




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Industrial electroheating equipment – Test methods for infrared emitters



Chauffage électrique industriel – Méthodes d’essais des émetteurs de


rayonnement infrarouge

















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

PRICE CODE
INTERNATIONALE

X
CODE PRIX


ICS 25.180.10 ISBN 978-2-8322-1837-2



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

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SIST EN 62798:2015
– 2 – IEC 62798:2014 © IEC 2014
CONTENTS
FOREWORD . 5
INTR ODUCTION . 6
1  Scope and object . 7
2  Normative references. 8
3  Terms and definitions . 8
3.1  General . 8
3.2  Radiation . 9
4  Classification of infrared emitters . 10
5  Type of tests and general conditions of their performance . 12
5.1  General – list of tests . 12
5.2  Test conditions . 15
5.2.1  Operating conditions during tests . 15
5.2.2  Standard environment for tests . 15
5.2.3  Non-standard environment for tests . 15
5.2.4  Supply voltage . 15
5.3  Stationary condition . 16
5.4  Number of emitters for tests . 16
6  Measurements . 16
6.1  General . 16
6.2  Time resolution . 16
6.3  Measurement of electric data . 16
6.4  Temperature measurement . 17
6.5  Irradiance and radiance measurement . 17
6.6  Spectral measurements . 18
6.6.1  General . 18
6.6.2  Calculation as a surrogate for measurement . 18
6.6.3  Required spectral range . 18
6.6.4  Measurement conditions . 18
6.6.5  Spectral meas urement s . 19
7  Technical tests . 19
7.1  General . 19
7.2  Tests concerning cap and holder of emitter . 19
7.2.1  General . 19
7.2.2  Cap and holder interchangeability . 19
7.2.3  Cap twist-off test . 19
7.3  Power consumption characteristics . 19
7.3.1  Rated power . 19
7.3.2  Variation of power with voltage . 19
7.3.3  Inrush current . 20
7.3.4  Emitter resistivity as estimate for rated power . 20
7.4  Emitter temperature tests . 20
7.4.1  Rated temperature . 20
7.4.2  Variation of source temperature with voltage . 21
7.4.3  Source temperature rise time . 21
7.4.4  Source temperature cooling time for quartz tube emitters . 22

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SIST EN 62798:2015
IEC 62798:2014 © IEC 2014 – 3 –
7.4.5  Source temperature cooling time for other emitters . 22
7.4.6  Quartz tube cooling time for quartz tube emitters . 22
7.4.7  Source temperature distribution . 22
7.4.8  Average temperature calculation from a thermal image . 23
7.4.9  Surface temperature distribution . 23
7.4.10  Distribution temperature . 24
7.4.11  Thermal ruggedness . 25
7.4.12  Pinching temperature of pinched emitters . 25
7.5  Radiation characteristics . 25
7.5.1  General . 25
7.5.2  Radial irradiation distribution of tubular emitters . 26
7.5.3  Reflectivity of a tubular emitter with applied reflector . 26
7.5.4  Planar irradiation field caused by an emitter . 26
7.5.5  Angular irradiation distribution caused by an emitter . 27
7.5.6  Emitted spectrum . 27
7.5.7  Rated total radiant power . 28
7.5.8  Irradiation reaction time . 29
7.6  Mechanical ruggedness . 29
7.6.1  Accelerat i on . 29
7.6.2  Vibration . 29
7.7  Lifetime of infrared emitters . 29
7.7.1  General . 29
7.7.2  Criteria defining end of life . 30
7.7.3  Lifetime measurement . 30
7.7.4  Induced lamp death for emitter with a tungsten coil . 31
7.7.5  Induced lamp death for other emitter . 31
7.7.6  Lifetime statement . 31
8  Emitter efficiency . 32
8.1  General . 32
8.2  Conversion efficiency . 32
8.3  Transfer efficiency . 32
8.3.1  General . 32
8.3.2  Simple approach . 33
8.3.3  Ray-tracing . 33
8.4  Irradiation efficiency . 33
Annex A (informative) Thermal infrared radiation . 34
A.1  General . 34
A.2  Spectral emission . 34
A.3  Emissivity . 36
A.4  Conservation of étendue . 36
Annex B (informative) Infrared classification not used in this standard. 37
Annex C (normative) Measurement of spectral emission and spectral data of the
emitter . . 38
C.1  General . 38
C.2  Comparative method . 38
C.3  Measurement of the spectral emissivity . 39
Annex D (informative) Zo nal spherical f a c tors . 40
Annex E (informative) Distribution of measurement positions for temperature
measurements . . 42

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SIST EN 62798:2015
– 4 – IEC 62798:2014 © IEC 2014
E.1  Reference operating temperature . 42
E.2  Temperature distribution coefficient . 42
Annex F (informative) End of life criteria for infrared emitter . 43
Annex G (normative) Cold state resistivity and rated power. 45
G.1  General . 45
G.2  Measuring with high accuracy for comparison . 45
G.3  Temperature influences on measurement accuracy . 45
G.4  Emitter manufacturing effects . 46
G.5  Error contributions . 46
Bibliography . . 47

Figure A.1 – Spectral emissive power and accumulated power of a grey emitter at
1 800 °C . 35
Figure D.1 – Illustration of the measurement geometry for zonal spherical factors . 41

Table 1 – Classification of infrared emitters by spectral emission . 11
Table 2 – List of tests, their applicability to different classes of infrared emitters and
the number of emitters needed for the tests . 13
Table A.1 – The generalised Wien’s displacement law . 35
Table B.1 – Classification based on terms defined in IEC 60050-841:2004 . 37
Table D.1 – Zonal spherical factors and corresponding angles . 40
Table F.1 – Instantaneous end-of-life . 43
Table F.2 – Gradual degradation . 44

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SIST EN 62798:2015
IEC 62798:2014 © IEC 2014 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

INDUSTRIAL ELECTROHEATING EQUIPMENT –

Test methods for infrared emitters

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 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
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 62798 has been prepared by IEC technical committee 27:
Industrial electroheating and electromagnetic processing.
The text of this standard is based on the following documents:
CDV Report on voting
27/938/CDV 27/942/RVC

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 contents of the corrigendum of November 2014 have been included in this copy.

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SIST EN 62798:2015
– 6 – IEC 62798:2014 © IEC 2014
INTRODUCTION
This standard on particular test methods for infrared electroheating emitters is one of TC 27
standards that describe test methods for various types of electroheating installations.
This standard is solely concerned with tests for infrared emitters. Tests that focus on the
performance of infrared equipment or installations are covered by IEC 62693, Industrial
electroheating installations – Test methods for infrared electroheating installations. The
rationale for this separation is that infrared installations are usually manufactured by other
companies than infrared emitters. Still, infrared emitters are a very important and distinct part
of infrared installations and a set of tests that allow for proper characterisation, comparison of
different infrared emitters is valuable to manufacturers of infrared installations.
The major guiding principle for this standard is to determine
– simple tests that define the basic characteristics of all infrared emitters and can be
performed with the usual test and measuring equipment available to different kinds of
companies, large or small;
– more complex tests that provide valuable extra information, but need a well-equipped
laboratory.

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SIST EN 62798:2015
IEC 62798:2014 © IEC 2014 – 7 –
INDUSTRIAL ELECTROHEATING EQUIPMENT –

Test methods for infrared emitters



1 Scope and object
This International Standard specifies test procedures, conditions and methods according to
which the main parameters and the main operational characteristics of industrial infrared
emitters are established.
A limitation of the scope of this standard is that the infrared emitters have a maximum spectral
emission at longer wavelengths than 780 nm in air or vacuum, and are emitting wideband
continuous spectra such as by thermal radiation or high pressure arcs.
1
defines infrared as optical radiation within the frequency range
IEC 60519-1:2010 [1]
between about 400 THz and 300 GHz. This corresponds to the wavelength range between
780 nm and 1 mm in vacuum. Industrial infrared heating usually uses infrared sources with
rated temperatures between 500 °C and 3 000 °C; the emitted radiation from these sources
dominates in the wavelength range between 780 nm and 10 µm.
Industrial infrared emitters under the scope of this standard typically use the Joule effect for
the conversion of electric energy in one or several sources into infrared radiation, which is
emitted from one or several elements. Such infrared emitters are especially
– thermal infrared emitters in the form of tubular, plate-like or otherwise shaped ceramics
with a resistive element inside;
– infrared quartz glass tube or halogen lamp emitters with a hot filament as a source;
– non-insulated elements made from molybdenum-disilicide, silicon-carbide, iron-chromium-
aluminium alloys or comparable materials;
– wide-spectrum arc lamps.
This standard is not applicable to
– infrared emitters which are lasers or light-emitting diodes (LEDs);
– infrared emitters for use by the general public;
– infrared emitters for laboratory use.
Most of the tests described, especially the destructive tests, are for type testing.
The tests specified in this standard are intended to be used for evaluating or comparing the
performance of emitters belonging to the same category.
Tests related to performance of industrial infrared electroheating installations are specified in
IEC 62693:2013.
Most tests specified in this standard are applicable to wide-spectrum arc lamps, but not all.
___________
1
 Numbers in square brackets refer to the Bibliography.

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SIST EN 62798:2015
– 8 – IEC 62798:2014 © IEC 2014
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 60061-1, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 1: Lamp caps
IEC 60061-2, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 2: Lampholders
IEC 60061-3, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 3: Gauges
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-7, Basic environmental testing procedures – Part 2-7: Tests – Test Ga and
guidance: Acceleration, steady state
IEC 60432-1:1999, Incandescent lamps – Safety specifications – Part 1: Tungste
...