YOKOGAWA Centum VP Manual

Technical
Information Explosion Protection
TI 33Q01J30-01E
TI 33Q01J30-01E
©Copyright May 2004 (YK)
37th Edition Nov. 2022 (YK)
Yokogawa Electric Corporation
2-9-32, Nakacho, Musashino-shi, Tokyo, 180-8750 Japan

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TI 33Q01J30-01E
Introduction
This book describes explosion protection compliance of CENTUM 3000 and CENTUM VP
(hereinafter CENTUM.) Some parts of this book will occupy the general explanation about
explosion protections, but it mainly explains what explosion protection complied with CENTUM
which is an integrated production control system, and what regulation it has. The product
explanation after standard maintenance phase start is leave for safety.
The engineering practice of explosion protection is regulated by each country, and in principle,
the wiring and the other methods for construction should be done in accordance with safety
standards. When you implement the explosion protection system on the job, select the
products as to comply with the standards of the country in which it is used, and the methods for
construction should be researched.
Furthermore, this document contains the details of the NFM020-A13, IFM035-A07,
NIE008-A101, NIE008-A102, IFM050-A100, NFM035-A100, and NFM036-A101 certicates that
are included in the product documentation.
All Rights Reserved Copyright © 2004, Yokogawa Electric Corporation May 18, 2018-00

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Safety Precautions
 Safety,Protection,andModicationoftheProduct
• In order to protect the system controlled by the product and the product itself and ensure
safe operation, observe the safety precautions described in the Technical Information (this
book and Installation Guidance) and the User’s Manuals.Yokogawa Electric Corporation
("YOKOGAWA") assume no liability for safety if users fail to observe these instructions
when operating the product.
• If this product is used in a manner not specied in the Technical Information (this book and
Installation Guidance) and the User’s Manuals, the protection provided by this product may
be impaired.
• If any protection or safety circuit is required for the system controlled by the product or for
the product itself, prepare it separately.
• Be sure to use the spare parts approved by YOKOGAWAwhen replacing parts or
consumables.
• Do not use the accessories (Power supply cord set, etc.) that came with the product for any
other products.
• Modication of the product is strictly prohibited.
• The following symbols are used in the product and instruction manual to indicate that there
are precautions for safety:
Indicates that caution is required. This symbol for the Product indicates the possibility
of dangers such as electric shock on personnel and equipment, and also indicates
that the user must refer to the User’s Manuals for necessary actions. In the
User’s Manuals, this symbol is used together with a word “CAUTION” or “WARNING”
at the locations where precautions for avoiding dangers are described.
Indicates that caution is required for hot surface. Note that the devices with this symbol
become hot. The risk of burn injury or some damages exists if the devices are touched or
contacted.
Identies a protective conductor terminal. Before using the Product, you must
ground the protective conductor terminal to avoid electric shock.
Identies a functional grounding terminal. A terminal marked “FG” also has the same
function. This terminal is used for grounding other than protective grounding. Before
using the Product, you must ground this terminal.
Indicates anAC supply.
Indicates a DC supply.
Indicates the ON state. The state of a power on/o󰀨 switch and others is indicated.
Indicates the OFF state. The state of a power on/o󰀨 switch and others is indicated.
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 SymbolsinthisBook
This book has the following symbols.
WARNING
Indicates precautions to avoid a danger that may lead to death or severe injury.
CAUTION
Indicates precautions to avoid a danger that may lead to minor or moderate injury or
property damage.
IMPORTANT
Identies important information required to understand the operations or functions.
TIP
Identies additional information.
SEE
ALSO
Identies a source to be referred to.
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 CautionsforSafelyApplyingtheDevice
Power Supply Wiring
WARNING
The connection of power cables and the selection of power cables must be done in accordance
with this book and the Installation Guidance, and implement so as to comply with the standards
and laws about explosion protection in the country or the area where the cables are laid.
Ground Wiring
WARNING
You should implement so as to comply with the standards and laws about explosion protection in
the country or the area where the cables are laid.
Input/Output Wiring
CAUTION
The connection of input and output should be done in accordance with this book and the
Installation Guidance, and implement so as to comply with the standards and laws about
explosion protection in the country or the area where the cables are laid.
• Wiring material and equipment which is electrically connected to this equipment should be
products that complied with standards and laws about explosion protection in the country or
the area where the cables are laid.
Replacement of fuse
WARNING
• The specied fuse must be used as a replacement.
• Before replacing fuse, conrm if there’s no dangerous gas, and the power supply is OFF.
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Maintenance
CAUTION
• The maintenance work should be done only by operators who received special training.
• Use a vacuum cleaner and soft cloth to clean up the equipment.
• At the time of the maintenance work, put on wrist straps and take the measures for
Electrostatic Discharge (ESD).
• If the label that indicates Danger is not legible, or if it has peeled o󰀨, order a new label using
part number T9029BX.
• Before starting the maintenance work, conrm if there’s no dangerous gas.
• The maintenance work should be done in accordance with the instructions provided in the
related Installation Guidance and User’s Manuals.
 TighteningTorqueofScrews
IMPORTANT
The tightening torque that the Product recommends is showed in the following table. However,
if the tightening torque of the screw is specied in the User’s Manuals, follow the instructions
described in the User’s Manuals.
Table TableofRecommendedTighteningTorque
Nominal diameter of a screw M2.6 M3 M3.5 M4 M5 M6 M8 M10
Recommended tightening torque
(N•m) 0.35 0.6 0.8 1.2 2.8 3.0 12.0 24.0
 DrawingConventions
Some drawings depicted in the user’s manual may be partially emphasized, simplied, or omitted
for the convenience of description.
Trademarks
TrademarkAcknowledgment
The names of corporations, organizations, products and logos herein are either registered
trademarks or trademarks of Yokogawa Electric Corporation and their respective holders.
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CENTUM
Explosion Protection
CONTENTS
TI33Q01J30-01E37thEdition
Introduction ..............................................................................................................i
Safety Precautions..................................................................................................ii
Trademarks ..............................................................................................................v
1. Overview of Explosion Protection .........................................................1-1
1.1 Primary Explosion Protection and Secondary Explosion Protection ........1-1
1.2 Explosion Protection Standards.....................................................................1-2
1.3 ClassicationofExplosionProtectionEquipment.......................................1-3
1.4 SymbolsThatIndicateSpecicationsofExplosionProtection..................1-8
2. CENTUM and Explosion Protection Instrumentation ..........................2-1
2.1 ExplosionProtectionStandardsthatCENTUMhasAcquired.....................2-1
2.2 ExplosionProtectionConstructionthatI/ODevicesofCENTUM
Comply...............................................................................................................2-2
2.3 OverviewofConnectingCENTUMtotheDevicesInstalledina
Hazardous Area.................................................................................................2-3
3. ExplosionProtectionInstrumentationinZone2/Division2 ...............3-1
3.1 Non-Incendive...................................................................................................3-1
3.1.1 CSANI (CSANon-Incendive)............................................................3-1
3.1.2 FM NI (FM Nonincendive)................................................................3-13
3.2 Ex “ec”, Type “n” ............................................................................................3-24
3.2.1 ATEX Ex “ec”,ATEX Type “n” ..........................................................3-24
3.2.2 IECEx Ex “ec” , IECEx Type “n”.......................................................3-24
3.2.3 ECAS-Ex Ex “ec” .............................................................................3-25
3.2.4 UKEX Ex “ec”, UKEX Type “n”.........................................................3-25
3.2.5 KCs Ex “ec”......................................................................................3-25
3.2.6 CCC-Ex/NEPSI Type “n”..................................................................3-26
4. Intrinsic Safety Explosion Protection Instrumentation ....................... 4-1
4.1 IntrinsicSafetyExplosionProtectionInstrumentationUsingBarrier
base plates.........................................................................................................4-2
4.1.1 Intrinsic Safety Explosion Protection ofATEX/UKEX Standard ........4-2
4.1.2 Intrinsic Safety Explosion Protection of IEC Standard ......................4-3
4.1.3 Intrinsic Safety Explosion Protection of FM Standard.......................4-4
4.1.4 Intrinsic Safety Explosion Protection of CSAStandard.....................4-5
4.1.5 Intrinsic Safety Explosion Protection of EAC Ex................................4-6
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4.1.6 Intrinsic Safety Explosion Protection of KCs .....................................4-7
4.2 IntrinsicSafetyExplosionProtectionInstrumentationUsingBarriers......4-8
Appendix 1. CSA NI/FM NI/IECEx Ex “ec”/ECAS-EX Ex “ec”.............App.1-1
Appendix1.1 FMNIControlDrawingofFCU(forFIOSystem)andFIO
Node Unit.........................................................................................App.1-1
Appendix1.2 CSANIControlDrawingforFIONodeUnit................................App.1-17
Appendix 1.3 CSA NI/FM NI/IECEx Ex “ec”/ECAS-EX Ex “ec” Control
DrawingofFCU(forN-IOsystem),N-IONodeUnit,and
FIO Node Unit ...............................................................................App.1-29
Appendix1.4 CSANI/FMNI/IECExEx“ec”ControlDrawingofN-IO
eldenclosure...............................................................................App.1-60
Appendix1.5 CSANI/FMNIControlDrawingofA2BN4D................................App.1-68
Appendix1.6 CSANI/FMNIControlDrawingofA2BN5D...............................App.1-71
Appendix 2. ATEX Ex “ec”/ATEX Type “n” / UKEX Ex “ec” /
UKEX Type “n” ...................................................................App.2-1
Appendix2.1 ATEXEx“ec”/UKEXEx“ec”InstructionofFCU(forFIOsystem)
and FIO Node Unit...........................................................................App.2-1
Appendix2.2 ATEXEx“ec”/UKEXEx“ec”InstructionofFCU(forN-IOsystem)
and N-IO Node Unit.......................................................................App.2-10
Appendix2.3 ATEXEx“ec”/UKEXEx“ec”InstructionofN-IOeld
enclosure.......................................................................................App.2-17
Appendix2.4 ATEXType“n”/UKEXType“n”InformationofA2BN4D ........App.2-19
Appendix2.5 ATEXEx“ec”/UKEXEx“ec”InformationofA2BN5D .............App.2-20
Appendix3. IECExEx“ec”/IECExType“n”ofA2BN4D/A2BN5D...App.3-1
Appendix3.1 IECExType“n”InformationofA2BN4D.......................................App.3-1
Appendix 3.2 IECEx Ex “ec”/ Intrinsic Safety/ ECAS-Ex Ex “ec”
InformationofA2BN5D ..................................................................App.3-3
Revision Information...............................................................................................i
Nov. 10, 2022-00

1. Overview of Explosion Protection 1-1
TI 33Q01J30-01E
1. Overview of Explosion Protection
Thischapterprovidesthegeneralexplanationaboutexplosionprotection.
1.1 Primary Explosion Protection and
Secondary Explosion Protection
In order to prevent explosions and its danger, plants must have an e󰀨ective explosion protection.
To prevent explosions of plant, as a comprehensive countermeasure, the following steps must be
taken.
(1)Step to prevent generating dangerous explosive atmospheres
(2)Step to prevent ignition to explosive atmospheres
(3) Step to limit the inuence of explosion within the security area
Steps such as (1) are called Primary explosion protection, Steps such as (2), (3) are called
Secondary explosion protection.
Primary Explosion Protection
Primary explosion protection is a step to avoid the formation of potentially explosive
atmospheres. It includes removing explosive gas and chemically changing explosive gas into
non-explosive gas.
Secondary Explosion Protection
Secondary explosion protection is a step to keep the inuence of explosion to a minimum. In
order to prevent the ignition, it pays attention to the electric circuit area of equipment in plant that
may cause it. Moreover, if it happens, it prevents the propagation of the inuence to the exterior.
CENTUM-compliant explosion protection products are for Secondary explosion protection. The
following chapters in this book mostly describe Secondary explosion protection.
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1. Overview of Explosion Protection 1-2
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1.2 Explosion Protection Standards
 ATEXDirective
In Europe, European Community (EC) directive 94/9/EG (March 23, 1994) was issued. This is a
new directive about explosion protection in Europe. On all the EC countries, it puts an obligation
to pay attention and assure the safety and health mainly for persons. This directive goes by
the name ofATEX.As one of the CE marking adaptation directive, it has been compulsory
since July 2003.ATEX means “Atmospheres Explosibles” in French, and “Potentially Explosive
Atmospheres” in English.
The target of this regulation is also the usage of equipments that are used at hazardous area,
and the explosion protection electric equipments/accident prevention systems that are used in
potentially explosive atmospheres. Since July 1, 2003, in EC area, although the product complies
withATEX explosion protection standard, in addition to this, it should comply with “ATEX
directive” about CE marking, and should have a specic indication. Unless it complies with the
directive, the explosion protection products are not allowed to be launched on the market in EU
countries. In order to comply with this directive, EN standard is undergoing revisions.
Mar. 26, 2015-00