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.
Oct. 5, 2018-00

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TI 33Q01J30-01E
 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.
Apr. 21, 2017-00

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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.
Jan. 22, 2021-00

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TI 33Q01J30-01E
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.
Dec. 3, 2021-00

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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.
May 21, 2004-00

1. Overview of Explosion Protection 1-2
TI 33Q01J30-01E
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

1. Overview of Explosion Protection 1-3
TI 33Q01J30-01E
1.3 ClassicationofExplosionProtection
Equipment
Explosion protection equipment is classied as follows:
• Classication by to explosion protection constructions: what kind of method is taken for
explosion protection?
• Classication by hazardous area and explosive gas: in what kind of environment are they
used?
 ClassicationbyExplosionProtectionConstructions
Type of explosion protection constructions are listed in the following table.
Table Type of explosion protection constructions
Type of explosion protection constructions Abbreviation of standard
Flameproof enclosures Type “d”
Pressurized enclosures Type “p”
Increased safety Type “e”
Oil immersion Type “o”
Intrinsic safety Type “i”
Powder lling Type “q”
Encapsulation Type “m”
Type of protection “n” Type “n”
Non-Incendive -
Classied roughly, explosion protection constructions include 4 types of the principle as below.
(1) It isolates the potentially explosive atmospheres from the place where sparks and high
temperature arise and prevents explosions. The constructions based on this principle
include Pressurized apparatus, Oil immersion, and Encapsulation.
(2) It keeps an explosion within the enclosure, if it is induced there. The constructions based on
this principle include Flame-proof enclosures.
(3) Even if sparks and heat is caused by an electric accident at the normal operation, it prevents
ignitions of potentially explosive atmospheres. The constructions based on this principle
include Increased safety, Type of protection “n”, Non-Incendive.
(4) If an electric accident such as short-circuit, ground fault, and burnout occurs, it doesn’t
ignite potentially explosive atmospheres, because of the system which the specic intrinsic
safety circuit is installed in. The constructions based on this principle include Intrinsic safety.
Intrinsic safety construction has the ia equipment, the ib equipment, and the ic equipment.
The ia equipment maintains its performance of explosion protection even if it has two
defects, it is able to react Zone 0 (Division 1). The ib equipment maintains its performance
of explosion protection even if it has one defect, it is able to react Zone 1 (Division 1). The
ic equipment maintains its performance of explosion protection under normal operating
conditions only, it is able to react Zone 2 (Division 2).
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1. Overview of Explosion Protection 1-4
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 DenitionandComparisonofExplosionProtectionConstruction
 Flame-proofEnclosures(Type“d”)
1) Denition: “Flame-proof enclosures” is totally enclosed construction. When gas or vapor
get into the enclosure and an explosion take place, the enclosure withstands the pressure
of explosion and prevents the ignition of explosion re to gas and vapor surrounding the
enclosure.
2) Construction
Depth of the gap
Gap
Explode
F010301.AI
* Even if explosion occurs inside the container,
the enclosure withstands it.
* No ignition occurs outside even if explosion
occurs inside the container.
* It restricts the surface temperature of the enclosure.
 FigureFlame-proofEnclosures(Type“d”)
 PressurizedApparatus(Type“p”)
1) Denition: “Pressurized apparatus” supplied protective gas such as air, nitrogen, and carbon
dioxide into the enclosure, so that gas or vapor doesn’t get into the enclosure.
2) Construction
Vent for exhaust
Gasket
Vent for supply
Air blower
F010302.ai
* It increases the internal pressure of the enclosure.
* Protective gas is filled in the container before turning
the power on.
* It shuts off the power, when the internal pressure
decreases.
* It restricts the surface temperature of the enclosure.
 FigurePressurizedApparatus(Type“p”)
 IncreasedSafety(Type“e”)
1) Denition: When a part of electric machine and apparatus (except insulating parts), which
has no possibility of the creation of sparks or arc, is under normal operation and turned on
electricity, “Increased safety” increases the insulation performance and the level of safety for
danger of the unacceptable high temperature and the external damage.
2) Construction
Impregnate
Gasket
Creepage
distance
Coil, Lighting apparatus,
Accumulator battery,
Electric heating object
F010303.ai
* Measures to increase the level of safety
so as not to spark.
• Coil is impregnated.
• Wires are connected so as not to slip.
• Creepage distance/insulation distance is kept.
• Tracking property of insulating material.
* It restricts the surface temperature of the coil, etc.
* An enclosure catching no dust is used (IP54/IP44).
 FigureIncreasedSafety(Type“e”)
Mar. 26, 2015-00

1. Overview of Explosion Protection 1-5
TI 33Q01J30-01E
 OilImmersion(Type“o”)
1) Denition: “Oil immersion” is an explosion protection construction that a part of electric
machine and apparatus, which may create sparks or arcs and may become an ignition
source by unacceptable high temperature, is immersed in insulating oil, so as not to ignite to
gas or vapor.
2) Construction
Insulating oil
F010304.ai
* The electric circuit immersed in insulating oil.
* It restricts the surface temperature of enclosure and oil.
 FigureOilImmersion(Type“o”)
 IntrinsicSafety(Type“i”)
1) Denition: “Intrinsic safety” is the explosion protection construction conrmed that the
sparks, arcs or heat, which the component part of the electric machine and apparatus
create, have no possibility of ignition to gas or vapor, by the spark ignition test and so on.
2) Construction
Energy restriction
Barrier
F010305.ai
* It has no ignition to gas, even if it's under
abnormal situation.
• It restricts the electric energy.
• Creepage distance/insulation distance is kept.
• It restricts the surface temperature of electric
component and so on.
* A barrier is necessary.
* IP22 enclosure (technical standard)
 FigureInstrinsicSafety(Type“i”)
 Encapsulation(Type“m”)
1) Denition: “Encapsulation” is the explosion protection construction that parts which may
ignite potentially explosive atmospheres by heating are embedded in sealing compound, so
that potentially explosive atmospheres cannot be ignited.
2) Construction
Mold F010306.ai
* The electric circuit is encapsulated by resin.
* It restricts the surface temperature of enclosure and resin.
 FigureEncapsulation(Type“m”)
Mar. 26, 2015-00

1. Overview of Explosion Protection 1-6
TI 33Q01J30-01E
Type of Protection “n” or Non-Incendive
1) Denition: “Type of protection “n” or Non-Incendive” is the special explosion protection
construction for Zone 2 or Division 2. It is applicable to electric equipments which is not
capable of igniting potentially explosive atmospheres under normal operation.
2) Construction
Energy
restriction
Sealing
F010307.ai
* Under normal operation, it restricts the electric sparks and so on.
• It seals the component that creates sparks.
• It restricts the energy that creates sparks.
• Creepage distance/insulation distance is kept.
• It restricts the surface temperature of electric component.
* The enclosure withstands the shock.
* The enclosure is sealed (BS standard).
Figure Types of Protection “n” or Non-Incendive
 ClassicationbyHazardousAreaandExplosiveGas
 ClassicationofHazardousArea
In the plant which handle ammable gas or vapor, when they are emitted and mixed with air while
at work, “potentially explosive atmospheres” are generated. The area that has a risk of explosion
is called “Hazardous area”.
Zone 0: potentially explosive atmospheres exist continuously or for a long time (at all time)
Zone 1: potentially explosive atmospheres may exist under normal operation of the plant and so
on (sometime)
Zone 2: no potentially explosive atmospheres exist under normal operation of the plant and so
on, or exist briey if they do (at accidents only)
Table ClassicationofHazardousArea
Europe
Australia U.S. Canada Example of usable explosion protection construction
Zone 0 Division 1 Intrinsic safety (ia)
Zone 1
Division 1 Intrinsic safety (ia) Flame-proof enclosures, Increased safety
Pressurized apparatus, Oil immersion
Division 2 Intrinsic safety (ib) Flame-proof enclosures, Increased safety
Pressurized apparatus, Oil immersion
Zone 2 Division 2
Intrinsic safety (ia, ib, ic)
Flame-proof enclosures, Increased safety
Pressurized apparatus, Oil immersion
Type of protection “n”
Non-Incendive
May 18, 2018-00

1. Overview of Explosion Protection 1-7
TI 33Q01J30-01E
 ClassicationofExplosiveGas
Classication of Explosive gas (vapor) involves a division by explosion intensity and a division by
explosion energy. Classications in the technical standard, IEC, ATEX, and UKEX are listed in
the following table.
Table ClassicationofExplosiveGas
Classication
Flame-proof enclosures Intrinsic safety
Major gas
Maximum gap in mm
where the re runs, when
the depth of joint surface is
set to 25 mm
Minimum ignition current ratio of the
target gas, when the minimum ignition
current of methane, which is calculated
by spark ignition test equipment, is
assigned 1
II A 0.9 or more More than 0.8 Propane
IIB More than 0.5, 0.9 or less 0.45 or more, 0.8 or less Ethylene
II C 0.5 or less Less than 0.45 Hydrogen,Acetylene
The United States and Canada have another classication.
Dec. 3, 2021-00

1. Overview of Explosion Protection 1-8
TI 33Q01J30-01E
1.4 SymbolsThatIndicateSpecicationsof
Explosion Protection
Each country has its own symbols. The following is an example of symbols.
 Europe(ATEX,IECEx,UKEX)
F010403.ai
EXA 15 ATEX 0017 X
(1) (2) (3) (4)
(1) EXA:
Notied body
(2) Year of issuance
(3) ATEX 0017:
EC-type examination certicate with sequence number 0017
(4) X
Specic conditions of use
F010404.ai
II 3(1) G Ex nA [ia Ga] IIC T4 Gc
(1) (2) (3) (4) (5) (6) (7) (8) (9)
(1)
Indicates that it is an explosion protection equipment
(2) Equipment group:
I: Underground mines and associated surface installations
II: All other surface installations
(3) Equipment category:
1: All other surface installations,
Level of protection: Very high, Presence of duration of explosive atmosphere: Continuous presence for Zone 0 and 20
2: All other surface installations,
Level of protection: High, Presence of duration of explosive atmosphere: Likely to occur for Zone 1 and 21
3: All other surface installations,
Level of protection: Enhanced, Presence of duration of explosive atmosphere: Unlikely to occur for Zone 2 and 22
( ): Associated apparatus
(4) G ammable gas / vapour or D combustible dust substances:
G: Firedamp
D: Coal dust
(5) Ex:
Indicates that it is an explosion protection equipment.
(6) Type of protection:
d: Flameproof enclosures “d”
px/py/pz: Pressurized enclosures “p”
q: Powder lling “q”
o: Oil immersion “o”
e: Increased safety “e”
ia/ib/ic: Intrinsic safety “i”
pv: Equipment protection by pressurized room “p”
nA/nC/nR: Type of protection “n”
ma/mb/mc: Encapsulation “m”
[ ]: Associated apparatus
(7) Equipment category:
IIA: Propane
II B: Ethylene
II C: Acetylene/ Hydrogen
Dec. 3, 2021-00

1. Overview of Explosion Protection 1-9
TI 33Q01J30-01E
(8) Temperature class:
(Maximum surface temperature [°C])
T1: 450
T2: 300
T3: 200
T4: 135
T5: 100
T6: 85
(9) Equipment Protection Levels (EPL)
Ga: All other surface installations,
Level of protection: Very high, Presence of duration of explosive atmosphere: Continuous presence, for Zone 0
Da: All other surface installations,
Level of protection: Very high, Presence of duration of explosive atmosphere: Continuous presence, for Zone 20
Gb: All other surface installations,
Level of protection: High, Presence of duration of explosive atmosphere: Likely to occur for Zone 1
Db: All other surface installations,
Level of protection: High, Presence of duration of explosive atmosphere: Likely to occur for Zone 21
Gc: All other surface installations,
Level of protection: Enhanced, Presence of duration of explosive atmosphere: Unlikely to occur for Zone 2
Dc: All other surface installations,
Level of protection: Enhanced, Presence of duration of explosive atmosphere: Unlikely to occur for Zone 22
Note: The symbols di󰀨er slightly between countries.
 TheUnitedStates,Canada
Explosion Proof for Class I Division 1 Group C T6
Indicates the explosion
protection construction
Target flammable
material and gases Temperature class
Explosion proof
Intrinsically safe
Non-Incendive
Dust ignition proof
Dust ignition proof
Class I: gas, vapor
Group A: acetylene
Group B: hydrogen
Group C: ethylene
Group D: propane
Class II: dust
Group E: metal powder
Group F: coal powder
Group G: grain powder
Class III: fabric,
floating substance
Maximum surface temperature
of equipment and component
T1: 450°C or less
T2: 300°C or less
T3: 200°C or less
T4: 135°C or less
T5: 100°C or less
T6: 85°C or less
F010402.ai
June 30, 2015-00

2. CENTUM and Explosion Protection Instrumentation 2-1
TI 33Q01J30-01E
2. CENTUM and Explosion Protection
Instrumentation
2.1 ExplosionProtectionStandardsthat
CENTUMhasAcquired
There are various standards for explosion protection in each region. Therefore, when equipment
tries to be used in a certain region, the equipment needs to be an approved product with
explosion protection standards adopted in the region. CENTUM, a global product, has complied
the standards adopted in NorthAmerica and Europe.
The table below lists the explosion protection standards that CENTUM complies and their
approval authorities. This chapter mainly describes the explosion protection compliance of
FIO/N-IO equipment.
Table ExplosionProtectionStandardsthatCENTUMComplies(1/2)
Explosion
protection
construction
ReferenceofExplosion-proofspecications,CompliedStandardandCompliant
Products
FCU FIO Node
Unit FCU N-IO Node
Unit FIO Node Unit N-IOeld enclosure A2BN4D A2BN5D
FM Non-Incendive App. 1.1 App. 1.1 App. 1.3 App. 1.3 App. 1.1 App. 1.4 App. 1.5 App. 1.6
FM intrinsic safe
explosion
protection –––––––Chap.
4.1.3
CSANon-Incendive –App. 1.2 –App. 1.3 App. 1.2 App. 1.4 App. 1.5 App. 1.6
CSAintrinsic safe
explosion
protection –––––––Chap.
4.1.4
ATEX Ex “ec” (*1) App. 2.1 App. 2.1 App. 2.2 App. 2.2 App. 2.1 App. 2.3 –App. 2.5
ATEX Type “n” ––––––App. 2.4 –
ATEX Type “i” –––––––Chap.
4.1.1
IECEx Ex “ec”
(*1) – – App. 1.3 App. 1.3 App. 1.3 App. 1.4 –App. 3.2
IECEx Type “n” ––––––App. 3.1 –
IECEx Type “i” –––––––Chap.
4.1.2
ECAS-Ex Ex “ec”
(*1) – – App. 1.3 App. 1.3 App. 1.3 – – App. 3.2
UKEX Ex “ec” (*1) App. 2.1 App. 2.1 App. 2.2 App. 2.2 App. 2.1 App. 2.3 –App. 2.5
UKEX Type “n” ––––––App. 2.4 –
UKEX Type “i” –––––––Chap.
4.1.1
EAC Ex Type “i” –––––––Chap.
4.1.5
KCs Type “i” –––––––Chap.
4.1.6
KCs Ex “ec” (*1) –––––Chap
3.2.5 – –
CCC-Ex/NEPSI
Type “n” –––––Chap
3.2.6 – –
–: Non-compliant
Note: Regarding the latest conformity standard, refer to the GS 33J01A10-01EN “Integrated Production Control System CENTUM VP
System Overview”.
*1: The products which use sealed devices also comply with Type “nC”. For detail , refer to Chapter 3.
Nov. 10, 2022-00

2. CENTUM and Explosion Protection Instrumentation 2-2
TI 33Q01J30-01E
2.2 ExplosionProtectionConstructionthatI/O
DevicesofCENTUMComply
As described in 2.1, countries dene their own standards and rules regarding technical methods
for explosion protection. With CENTUM, NI, Ex “ec”, Type “n”, and intrinsic safety explosion
protection are adopted as explosion protection construction for the installation of FCS or node
unit in hazardous areas. The adoption of NI, Ex “ec”, andType “n” with FIO and N-IO devices of
CENTUM allows FCS or node unit to be installed in Class II hazardous area (Division 2, Zone 2)
which covers most hazardous areas. This provides more variety of instrumentation.
With N-IO eld enclosure, NI, and Ex “ec”, are adopted as explosion protection construction for
the installation of N-IO eld enclosure in hazardous areas.
The adoption of NI allows N-IO eld enclosure to be installed in Class II hazardous area (Division
2 or Zone 2).
N-IO devices are equipment compliant with intrinsic safety explosion protection and are the
modules that can be connected to the devices installed in Zone 0, Zone 1 and Zone 2 (Division 1,
Division 2).
To install FCS or node unit in a hazardous area, the node itself and the terminal board as well
as the I/O modules should acquire standards. The gure bellow shows one example of Ex “ec”/
Type “n” standard compliant devices. The devices shown in half-tone dot meshing and the cables
shown in heavy line are Ex “ec”/Type “n” compliant products. The same is with NI compliant
devices. FCS or node unit can be installed in Zone 2 (Division 2).
See the tables inAppendix for details of each CENTUM equipment and their approved
standards.
<Hazardous area Zone 2> <Non-hazardous area>
FOUNDATION Fieldbus
ER Bus
ANB11S/ANB11D
/A2BE2D
AEA4D etc.
ESB Bus Node Unit
ANB10S/ANB10D/A2BE2D
Intrinsic safety
device Intrinsic safety device
Type “n”
Ex "ec" device
Field wiring
terminal for
Type "n"
F020201.ai
Terminal board Signal cable
Power
supply
module
Optical ESB Bus
Repeater Master
Module
Optical ESB Bus
Repeater Slave
Module
Optical ESB Bus Node Unit
Cabinet
Optical ESB Bus
I/O module,
terminal block
*1 *1
*1 *1
Safety
Barrier (*2) Safety
Barrier (*2)
*1
*1: Explosion-proof wiring that is dened in EN 60079-14 and the rules/standards of each country or region.
*2: Explosion-proof structure for hazardous area is required.
Figure ExampleofEx“ec”/Type“n”StandardCompliantDevices
Dec .3, 2021-00

2. CENTUM and Explosion Protection Instrumentation 2-3
TI 33Q01J30-01E
2.3 OverviewofConnectingCENTUMtothe
DevicesInstalledinaHazardousArea
This section describes the overview of connecting CENTUM to the devices installed in a
hazardous area by giving some examples.
 OverviewofConnectingEx“ec”/Type“n”compliantFIOModulewith
Devices
Ex “ec”/Type “n” compliant module can be connected to the intrinsic safety equipment installed in
Zone 0, Zone 1 and Zone 2 using a barrier and explosion-proof wiring as shown in the following
gures.
They can be connected to Intrinsic safety equipment installed in Zone 0, 1 and 2 using Explosion-
proof wiring that is dened in EN60079-14 and the rules/standards of each country or region.
They can be connected to Ex “ec”/Type “n” equipment installed in Zone 2 using explosion-proof
wiring that is dened in EN 60079-14 and the rules/standards of each country or region.
And they can be connected to ameproof equipment using explosion-proof wiring that is dened
in EN 60079-14 and the rules/standards of each country or region.
Ex “ec”/Type “n” compliant module and FCS or node unit (24 V DC feeding type) can be installed
in Zone 2 by mounting in a keyed metal cabinet with protection rating of IP54 or higher.
Zone1 Zone2 Non-HazardousAreaZone0 Node unit
F020303.ai
Safety
Barrier
Safety
Barrier
Safety
Barrier
Flameproof
device
Intrinsic safety
device
Type “n”
Ex "ec" device
Intrinsic safety
device
Intrinsic safety
device
*1
*1
*1
*1
*1
*1: Explosion-proof wiring that is dened in EN 60079-14 and the rules/standards of each country or region.
Figure ConnectionofEx“ec”/Type“n”CompliantModule(1)
Dec .3, 2021-00