Hazardous Area Certification

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Airacom ATEX Reference Guide explains European hazardous location protection methods and markings.

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Airacom ATEX RTLS

Hazardous area reference guide

Understanding ATEX

PROTECTION METHODS

Protection Method
IEC
Intrinsic Safety
ia
60079-11
Intrinsic Safety
ib
60079-11
Flameproof
d
60079-1
Pressurization
p
60079-2
Increased Safety
e
60079-7
Increased Safety
e
60079-7
Encapsulation
m
60079-18
Oil Immersion
o
60079-6
Powder Filling
q
60079-5
Non-sparking
n
60079-15
General Requirement
60079-0
Inspection & Maintenance
60079-17

PROTECTION
CONCEPTS

Protection Concepts
Symbol
How it Works
Category
Increased Safety
Ex e
No arcs, sparks or hot surfaces
2 & 3
Non-sparking
Ex nA
No arcs, sparks or hot surfaces
3
Flameproof / Enclosed Break*
Ex d Ex nW
Contain the explosion and quench flame (*Enclosed Break can also be noted as Ex nC)
2 & 3, 3
Quartz/Sand Filled
Ex q
Contain the explosion and quench flame
2 & 3
Intrinsic Safety / Energy Limitation
Ex ia / Ex ib / Ex nL
Limit energy of sparks; limit the temperature
1, 2 & 3 / 2 & 3 / 3
Pressurised / Simplified Pressurisation
Ex p / Ex nP
Keep the flammable gas away from any hot surfaces and ignition capable equipment
2 & 3 / 3
Encapsulation
Ex m
Keep the flammable gas away from any hot surfaces and ignition capable equipment
2 & 3
Oil Immersion / Restricted Breathing
Ex o / Ex nR
Keep the flammable gas away from any hot surfaces and ignition capable equipment
2 & 3 / 3
Special
Ex s
Any proven method
1, 2 & 3

FIRE
TRIANGLE

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Flammable & Combustible Substance

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Air / Oxygen

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Ignition Source

All three elements of the fire triangle must be present for ignition to occur.

TEMPERATURE
CLASSES

Max. Surface Temperature
Fahrenheit
T-Class
450° C
(842° F)
T1
300° C
(572° F)
T2
200° C
(392° F)
T3
135° C
(275° F)
T4
100° C
(212° F)
T5
85° C
(185° F)
T6*
Equipment Group:
Equipment Category:
Atmosphere:
I (Mines)
M1
Methane & Dust
I (Mines)
M2
Methane & Dust
II (Above Ground)
1
Gas, Vapor, Mist, Dust
II (Above Ground)
2
Gas, Vapor, Mist, Dust
II (Above Ground)
3
Gas, Vapor, Mist, Dust
Protection Level:
Required Protection Performance & Operation:
Very High
Two faults, remain energised and functioning
High
Severe normal operation, De-energize in exp. atm
Very High
Two faults
High
One fault
Low
Normal operation

GAS
GROUPS

Typical Material
Methane
I
Propane
IIA
Ethylene
IIB
Hydrogen
IIC
Acetylene
IIC
All Gases
II