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Marking of Weighing Equipment for Hazardous Areas Typical Marking Example Explosion Protection Marking
Group / Class, Area Classificat Classification ion
Protection Method
Explosion Group
Temperature Class
II 2 G/D
Ex ib
IIB
T4
Ex ib
IIB
T4
AEx ib
IIB
T4
FM
NEC 505
Group A, B, C, D, E, F
T4
FM / UL
NEC 500
EPL*
Directive
Legislation
ATEX
IEC / CENELEC (Europe)
Class I Zo Zone 1 Class I, II, III Division 1
Da
IECEx
(USA)
(USA) *Equipment Protection Level
Group, Area Classication CENELEC / IEC / ATEX Equipment Group
Area Classification ATEX 94/9/EC
Equipment Protection Level
II
Protection Method Classified Area Explosive atmosphere present
ATEX
CENELEC/ IEC
Gas / Vapor
Dust
1G/1D*
Ga/Da*
Zone 0
Zone 20
Continuously or for long periods of time
2G/2D*
Gb/Db*
Zone 1
Zone 21
Occasionally in normal operation
3G/3D*
Gc/Dc*
Zone 2
Zone 22
Infrequently or for short periods of time
Type of Protection
Symbol
Increased Safety
Ex e
Temperature Class
NEC 505 / CENELEC
NEC 506/ CENELEC
Explosive atmosphere present
Zo n e 0
Zone 20
Continuously or for long periods of time
Zo n e 1
Zone 21
Occasionally in normal operation
Division 1
Division 2
Zo n e 2
Zone 22
Maximum Surface Temperature
NEC 500
450ºC
T1
T1
300ºC
T2
T2
Infrequently or for short periods of time or do not likely to occur in normal operation
Equipment Substance Classification Group
Acetylene
A
Hydrogen
B
IECEx / ATEX Group
Ex ia
Class I Ethylene
C
Propane
D Mining
NEC 505 / CENELEC
Pressurized
280ºC
T2A
260ºC
T2B
230ºC
T2C
IIB
500
IIA
IIIC
215ºC
T2D
200ºC
T3
180ºC
T3A
G Class III
–
Remote Weighing Display
Application Terminal Terminal
1
II 2 G
1
II 3 G
2
II 1 G
1
II 2 G
1
II 3 G
2
Keep the explosive atmosphere away from the ignition source
II 2 G II 3 G
1 2
Ex nA
non-sparking device
II 3 G
2
Ex nC
sparking devices and components
II 3 G
2
restricted
II 3 G
2
Ex mb
Ex o Ex “o”
T3
Keep the explosive atmosphere away from any source of ignition
IEC EN 60079-7 ISA/UL 60079-7
IEC EN 60079-11 UL 60079-11 FM 3610
IEC EN 60079-2 UL 60079-2 FM 3620
IEC EN 60079-18 ISA/UL 60079-18
IEC EN 60079-6 ISA/UL 60079-6 FM 3600
Ex “n”
IEC EN 60079-15 ISA/UL 60079-15 FM 3600
165ºC
T3B
Ex n R
160ºC
T3C
Ex nL
limited Energy
II 3 G
2
135ºC
T4
Ex d
Contain the explosion, quench the flame
II 1 G II 2 G
1 2
IEC EN 60079-1 ISA/UL 60079-1
Special enclosure design, measuring equipment
II 1 D II 2 D
1 2
IEC EN 61241-1 IEC EN 60079-31
T4
Flame Proof
Ex “d”
T4A
III B
100ºC
T5
T5
III A
85ºC
T6
T6
505
500
Protection by enclosure
tD Ex “tD”
Hazardous Area
Safe Area
Hazardous Area
II 1 G
1, 2
Ex ma
Oil Immersion
1 2
II 2 G II 3 G
Ex mc
120ºC
F
Non-conductive Dusts
Purge enclosure with the inert pressurized air
Ex p
Encapsulation
E Class II
Combustible Fibers and Flyings
Limit energy; no sparks or surface temperature
E x ib
Protection „n“
I
Combustible Metal Dusts Conductive Dusts
Intrinsic Safety
II 2 G II 3 G
NEC
IIC
Methane
Dust / water tight enclosure
Ex “m”
Explosion Substance Group NEC / IECEX / ATEX Substance
Standard
Ex ic
Area Classication NEC500
Principle Categ Cat egory ory Div Divisi ision on
*G = Gas / D = Dust
Class, Area Classication NEC 500/ 505 /506
Design
Safe Area Communication Interface Module
Application Terminal Terminal
Communication Communicatio n Interface Module
RS232 Printer RS232
Ethernet
RS232 Tank on Weigh Modules
PC connection I/O Control
Remote Terminal Power Supply
Junction Box AC Source Power Supply
Hazardous Solutions Zone – 1/21, Division 1
RS232 Printer
Crossed Ethernet cable
Analog Platform PC connection Hazardous Solutions Zone – 1/21, Division 1
www.mt.com/ind-wp-intrinsic-safe
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