IEC PAS 63312:2021

Technical specification for flame detector system of boiler

IEC PAS 63312:2021 deals with the general requirements, classification and technical requirements, installation and commissioning requirements, inspection and maintenance requirements, test methods and requirements of radiant energy sensing flame detectors (including IR, UV, visible light, and imaging-based flame detectors).
This PAS is applicable to the type selection, design, installation, commissioning, inspection, maintenance and acceptance of the radiant energy sensing flame detectors, which monitor the flame status of burners

Standards Content (sample)

IEC PAS 63312
Edition 1.0 2021-01
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
colour
inside
Technical specification for flame detector system of boiler
IEC PAS 63312:2021-01(en)
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IEC PAS 63312
Edition 1.0 2021-01
PUBLICLY AVAILABLE
SPECIFICATION
PRE-STANDARD
colour
inside
Technical specification for flame detector system of boiler
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.060 ISBN 978-2-8322-9241-9

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC PAS 63312:2021  IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 5

INTRODUCTION ..................................................................................................................... 7

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 8

3 Terms and definitions ...................................................................................................... 9

4 General ......................................................................................................................... 12

4.1 General requirements ........................................................................................... 12

4.2 Power supply ........................................................................................................ 12

4.3 Functions and performance of flame detector ........................................................ 12

4.4 Signal output......................................................................................................... 13

4.5 Interchangeability ................................................................................................. 13

4.6 Installation ............................................................................................................ 13

4.7 Commissioning ..................................................................................................... 13

4.8 Inspection and maintenance ................................................................................. 13

4.9 Tests .................................................................................................................... 14

5 Classification and requirements (design) ....................................................................... 14

5.1 Classification of flame detectors ........................................................................... 14

5.1.1 Classification principle ................................................................................... 14

5.1.2 Classification according to detection principle ................................................ 14

5.1.3 Classification according to the structure of flame detector ............................. 15

5.1.4 Classification according to installation method ............................................... 15

5.1.5 Classification according to safety level .......................................................... 15

5.2 Technical requirements of flame detectors ............................................................ 15

5.2.1 Basic functional requirements ........................................................................ 15

5.2.2 Basic performance requirements ................................................................... 17

5.2.3 Reliability requirements ................................................................................. 18

5.3 Technical requirements of cooling system (optional, depending upon the

actual requirements of flame detectors) ................................................................ 20

5.3.1 Functional requirements of cooling air system ............................................... 20

5.3.2 Performance requirements of cooling air system ............................................ 21

6 Installation and commissioning requirements ................................................................. 22

6.1 System installation requirements .......................................................................... 22

6.1.1 Installation preparations ................................................................................ 22

6.1.2 Installation of flame detectors ........................................................................ 23

6.1.3 Acceptance of installation .............................................................................. 26

6.2 Commissioning requirements after installation ...................................................... 27

6.2.1 Static commissioning ..................................................................................... 27

6.2.2 Dynamic commissioning ................................................................................ 29

6.2.3 Contents of system dynamic commissioning .................................................. 29

6.2.4 Acceptance of system commissioning ............................................................ 31

7 Requirements on inspection, operation and maintenance .............................................. 32

7.1 System inspection and maintenance requirements ................................................ 32

7.1.1 Preparations .................................................................................................. 32

7.1.2 Power supply inspection ................................................................................ 33

7.1.3 Installation inspection of flame detectors ....................................................... 33

7.1.4 Dismantlement and inspection of optical fibers .............................................. 33

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IEC PAS 63312:2021  IEC 2021 – 3 –

7.1.5 Inspection and maintenance of analysis and processing unit ......................... 34

7.1.6 Inspection and maintenance of cables ........................................................... 35

7.1.7 Inspection and maintenance of cooling air system ......................................... 35

7.2 System test requirements ..................................................................................... 36

7.2.1 Power system test ......................................................................................... 36

7.2.2 Inspection on the analysis and processing unit .............................................. 36

7.2.3 Inspection and tests on flame detector probes ............................................... 36

7.2.4 Basic functional tests ..................................................................................... 37

7.2.5 Parameter adjustment test ............................................................................. 37

7.2.6 Check of parameter settings .......................................................................... 37

7.2.7 Tests on cooling fans ..................................................................................... 37

7.3 System operation .................................................................................................. 38

7.3.1 Restart .......................................................................................................... 38

7.3.2 Maintenance during operation ........................................................................ 38

7.3.3 Inspections before boiler shutdown ................................................................ 39

7.4 System maintenance requirements ....................................................................... 39

7.4.1 Routine maintenance ..................................................................................... 39

7.4.2 Regular maintenance ..................................................................................... 39

7.5 Archives ................................................................................................................ 40

8 Test methods and requirements ..................................................................................... 41

8.1 Test methods ........................................................................................................ 41

8.1.1 General ......................................................................................................... 41

8.1.2 Test reference conditions .............................................................................. 41

8.1.3 Test instruments and equipment .................................................................... 41

8.1.4 Test items and methods ................................................................................. 42

8.2 Equipment factory acceptance test........................................................................ 44

8.2.1 Test items ...................................................................................................... 44

8.2.2 Judgment of eligibility .................................................................................... 44

8.3 Type test ............................................................................................................... 44

8.3.1 General ......................................................................................................... 44

8.3.2 Situations requiring type test ......................................................................... 44

8.3.3 Sampling principles ....................................................................................... 44

8.3.4 Judgment of eligibility in type test .................................................................. 45

Annex A (informative) Composition of flame detector system ............................................... 46

A.1 General ................................................................................................................. 46

A.2 Flame detector ...................................................................................................... 46

A.3 Signal transmission components and cables ......................................................... 47

A.4 Analysis and engineering tools .............................................................................. 47

A.5 Power system ....................................................................................................... 47

A.6 Cooling air system (optical, depending on design requirements) ........................... 47

Annex B (informative) Marking, packaging, transportation and storage of flame

detectors .............................................................................................................................. 48

B.1 Marking ................................................................................................................. 48

B.2 Packaging ............................................................................................................. 48

B.3 Transportation ...................................................................................................... 48

B.4 Storage ................................................................................................................. 48

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– 4 – IEC PAS 63312:2021  IEC 2021

Figure A.1 – Schematic diagram of a typical light signal-based flame probe .......................... 46

Figure A.2 – Schematic diagram of an imaging-based flame detector probe .......................... 46

Table 1 – Configuration of monitoring and interlocking instruments of flame detector

cooling air system ................................................................................................................. 20

Table 2 – Installation acceptance criteria of flame detector system ....................................... 26

Table 3 – Commissioning acceptance items of flame detector system ................................... 32

Table 4 – Test instruments and equipment ............................................................................ 41

Table 5 – Requirements on insulation resistance tester ........................................................ 42

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IEC PAS 63312:2021  IEC 2021 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TECHNICAL SPECIFICATION FOR FLAME DETECTOR SYSTEM OF BOILER
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

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

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

A PAS is an intermediate specification made available to the public and needing a lower level

of consensus than an International Standard to be approved by vote (simple majority).

IEC PAS 63312 has been processed by subcommittee 65B: Measurement and control devices,

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

The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document
Draft PAS Report on voting
65B/1175/DPAS 65B/1180/RVDPAS

Following publication of this PAS, which is a pre-standard publication, the technical committee

or subcommittee concerned may transform it into an International Standard.
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– 6 – IEC PAS 63312:2021  IEC 2021

This PAS shall remain valid for an initial maximum period of 2 years starting from the

publication date. The validity may be extended for a single period up to a maximum of 2 years,

at the end of which it shall be published as another type of normative document, or shall be

withdrawn.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
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IEC PAS 63312:2021  IEC 2021 – 7 –
INTRODUCTION

The flame detector is the key testing equipment for the boiler furnace safety protection and

burner interlock control. In the whole combustion process of the boiler (especially in the

variable operating condition), it detects the change of the combustion condition, and the

corresponding control measures are taken through the connected terminal devices; so its

reliability is related to the safety of the combustion system and the quality of the terminal

products. Due to the difference in combustion conditions in the furnace, the reliability of the

flame detector itself and the quality of the installation and maintenance, many problems are

exposed during the operation, such as peeping of fire detection signals, missed detection,

instability, false alarm information, fiber overheating loss, etc. All of these will bring safety

hazards to the industrial production.

The purpose of this PAS is to develop comprehensive technical specifications for the

functions and performance of industrial boiler flame detectors, as well as the technical

requirements related to design, manufacture, installation, testing, operation, maintenance,

etc., so as to provide the technical basis for flame detector system users.
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– 8 – IEC PAS 63312:2021  IEC 2021
TECHNICAL SPECIFICATION FOR FLAME DETECTOR SYSTEM OF BOILER
1 Scope

This PAS deals with the general requirements, classification and technical requirements,

installation and commissioning requirements, inspection and maintenance requirements, test

methods and requirements of radiant energy sensing flame detectors (including IR, UV, visible

light, and imaging-based flame detectors).

This PAS is applicable to the type selection, design, installation, commissioning, inspection,

maintenance and acceptance of the radiant energy sensing flame detectors, which monitor

the flame status of burners.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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 60034-30-1, Rotating electrical machines – Part 30-1: Efficiency classes of line operated

AC motors (IE code)
IEC 60068-2-1, Environmental testing – Part 2-1: Tests – Test A: Cold
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Test B: Dry heat

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

IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock

IEC 60068-2-78, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady

state
IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
IEC 60079-1, Explosive atmospheres – Part 1: Equipment protection by flameproof
enclosures "d"
IEC 60529, Degrees of protection provided by enclosures (IP Code)

IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and

laboratory use – Part 1: General requirements

IEC 61326-1, Electrical equipment for measurement, control and laboratory use – EMC

requirements – Part 1: General requirements

IEC 61326-2-5, Electrical equipment for measurement, control and laboratory use – EMC

requirements – Part 2-5: Particular requirements – Test configurations, operational conditions

and performance criteria for field devices with field bus interfaces according to IEC 61784-1

NFPA 85, Boiler and Combustion Systems Hazards Code
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IEC PAS 63312:2021  IEC 2021 – 9 –
ANSI/TIA/EIA-232-F, Interface between Data Terminal Equipment and Data Circuit-
Terminating Equipment Employing Serial Binary Data Interchange

ANSI/TIA/EIA-422-B, Electrical Characteristics of Balance Voltage Digital Interface Circuits

ANSI/TIA/EIA-644-A, Electrical Characteristics of Low Voltage Differential Signaling (LVDS)

Interface Circuits
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
flame detector

device in the furnace safety supervisory system that detects the combustion status in real

time according to the flame characteristics of the fuel, and which, when the flame status fails

to meet the preset conditions, considers the target flame abnormal or disappeared and sends

a signal in a certain manner to stop the corresponding fuel supply
3.2
infrared signal

radiant energy signals falling within the infrared spectrum, emitted from the flames of burning

fuel such as coal and oil
3.3
ultraviolet signal

radiant energy signals falling within the ultraviolet spectrum, emitted from the flames of

burning fuel such as natural gas and light oil
3.4
visible light signal

radiant energy signals falling within the visible light spectrum, emitted from the flames of

burning fuel such as lean coal and mixed fuels
3.5
flame on
presence of flame in the furnace, as computed by the flame detector system
3.6
flame off
absence of flame in the furnace, as computed by the flame detector system
3.7
target flame

predefined flame to be detected, rather than the extended background radiation or the

adjacent and opposing flames
3.8
flame intensity

value computed by flame detector according to the received radiant energy intensity of flame,

representing the radiant energy intensity of the flame
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– 10 – IEC PAS 63312:2021  IEC 2021
3.9
flicker frequency

pulsation frequency of flame radiant energy, representing the change rate of the target flame's

radiant energy intensity
3.10
AC amplitude

pulsation amplitude of radiant energy from flame, representing the peak-to-peak value of the

radiant energy intensity pulsation of target flame
3.11
flame quality

extent away from the flame-off status, computed from the detected flame intensity and flicker

frequency, representing the degree of flame stability
3.12
flame threshold

minimum value set for the flame detector to determine the presence of flame (i.e. flame-on

threshold) or the maximum value to determine the absence of flame (i.e. flame-off threshold)

3.13
flame relay

on/off control switch that switches on when the flame logic judges that flame is present and

switches off when it judges that flame is absent
3.14
fault relay

on/off control switch that switches on when no fault is detected and switches off when any

fault is detected
3.15
flame detector probe

device installed locally, capable of flame information sensing, photoelectric conversion and

signal amplification
3.16
analysis and processing unit

device that receives the signals transmitted from one or more flame detector probes, and,

after analysing and processing by the corresponding processor, outputs the digital and analog

signals of each flame signal
Note 1 to entry: The relevant parameters of each flame can be set independently.
3.17
one-to-one detection
detection mode in which each target flame has a separate, fixed flame detector
3.18
flame detector peeping

situation that exists when the flame detector cannot distinguish between a target flame and a

non-target flame, and considers a non-target flame as the target flame
3.19
static commissioning

commissioning of flame detector system using simulative light sources before the boiler is

started up
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IEC PAS 63312:2021  IEC 2021 – 11 –
3.20
dynamic commissioning

commissioning of flame detector system after the boiler is started up, during which the flame

detection data throughout the period from the startup to the full load operation of the boiler

under typical operating conditions is analyzed and compared and the parameters setting is

completed to meet the actual operating requirements of the boiler
3.21
light signal-based flame detector

flame detector that detects flames relying on the intensity, pulsation and other signals of the

radiant light emitted by target flame, including infrared, visible light, ultraviolet, dual-spectrum,

and full-spectrum types
3.22
imaging-based flame detector

flame detector that detects the flame by acquiring the real-time video images of the target

flame
3.23
Class A unit overhaul

thorough inspection and repair on the generator unit, intended to maintain, restore or improve

the performance of the unit equipment

Note 1 to entry: Class A is the highest level overhaul among regular unit overhauls.

3.24
Class B overhaul

inspection and repair on the faulty or defective equipment within the unit, which may include

some targeted Class A overhaul items or rotational maintenance items depending on the

evaluation outcome of the unit
3.25
Class C overhaul

targeted inspection, evaluation and repair carried out on the unit according to the wearing and

aging trends of equipment, which may include the replacement of a small number of parts, the

defect elimination, adjustment, preventive tests and other operations on the equipment, as

well as some Class A overhaul items or rotational maintenance items
3.26
troubleshooting

activities performed on faulty equipment for the purpose of restoring it to such a status that it

can execute its intended functions
Note 1 to entry: Troubleshooting includes diagnosis, repair, and replacement.
3.27
mean time between operating failures
MTBF
expectation of the duration of the operating time between failures
[SOURCE: IEC 60050-192:2015, 192-0
...