Industrial electroheating equipment - Test methods for infrared emitters

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.
IEC 60519-1:2010 [1] 1 defines infrared as optical radiation within the frequency range
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-chromiumaluminium
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.

Industrielle Elektrowärmeeinrichtungen - Prüfverfahren für Infrarotstrahler

Chauffage électrique industriel - Méthodes d’essais des émetteurs de rayonnement infrarouge

L'IEC 62798:2014 spécifie les modes opératoires d'essais, les conditions et méthodes d'essais selon lesquels sont établis les principaux paramètres et les principales caractéristiques de fonctionnement des émetteurs industriels de rayonnement infrarouge. Une limitation du domaine d'application de la présente norme réside dans le fait que les émetteurs de rayonnement infrarouge ont une émission spectrale maximale aux longueurs d'onde supérieures à 780 nm dans l'air ou dans le vide, et émettent des spectres continus à large bande tels que par rayonnement thermique ou arcs à haute pression.

Oprema za industrijsko električno ogrevanje - Preskusne metode za infrardeče oddajnike

General Information

Status
Published
Publication Date
17-May-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
09-Jan-2015
Due Date
16-Mar-2015
Completion Date
18-May-2015

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SLOVENSKI STANDARD
SIST EN 62798:2015
01-junij-2015
2SUHPD]DLQGXVWULMVNRHOHNWULþQRRJUHYDQMH3UHVNXVQHPHWRGH]DLQIUDUGHþH
RGGDMQLNH
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.

---------------------- Page: 1 ----------------------
SIST EN 62798:2015
---------------------- Page: 2 ----------------------
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
---------------------- Page: 3 ----------------------
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.
---------------------- Page: 4 ----------------------
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
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
---------------------- Page: 7 ----------------------
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.

---------------------- Page: 11 ----------------------
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.
---------------------- Page: 12 ----------------------
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.
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.

___________
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 13 ----------------------
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
...

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