4 ATEX marking – meaning of icon
•
IEX balances meet the requirements of group II, class 2 for devices
in accordance with Directive 94/9/WE and are marked as -
II 2 G
IIB T4
.
Explanation of icons as per Directive 94/9/WE:
Balance IEX is intended for indoor and outdoor use. However, they should not be
exposed to chemical vapours, extreme temperatures or extreme humidity. The
platform balance construction is made of soft alloyed steel and the weighing cells are
made of aluminium.
Device group:
I – Underground pieces
of mines
II – all other places posing
a hazard due to explosive
atmosphere
Category for group II
devices:
1 – The device guarantees
a very high safety level,
- for operation in areas
0,1,2
2 – The device guarantees
a very high safety level,
- for operation in areas
1,2
3 – The device guarantees
a normal safety level,
- for operation in area 2
Explosive atmosphere:
G – Caused by gas,
steam and mist.
D – Caused by dust
Electrical
equipment –
compatible with
one or few types
of explosion
protection
constructions
Icon for explosion
protection used
Construction
type:
o – Oil protection
p – Gas
protection
with
excessive
pressure
q – Sand
protection
d – Flameproof
protection
e – Reinforced
construction
ia – Intrinsically
safe
construction
for operation
in areas
0,1,2,
ib – Intrinsically
safe
construction
for operation
in areas 1,2,
Temperature class – max
surface temperature of device
parts exposed to explosive
mixtures:
T1: 450
0
C
T2: 300
0
C
T3: 200
0
C
T4:
135
0
C
T5:
100
0
C
T6:
85
0
C
Temperature class
of gas and vapour
spontaneous ignition:
T1: > 450
0
C
T2: > 300
0
C
T3: > 200
0
C
T4:
> 135
0
C
T5:
> 100
0
C
T6:
> 85
0
C
Safety level
Gas atmosphere:
- Ga
- Gb
- Gc
Dust atmosphere:
- Da
- Db
- Dc
Gas explosivity group -
Examples:
-IIA:
Propane (T1)
Benzene (T3)
Butane (T2)
Ethyl alcohol (T2)
-IIB:
Ethylene (T2)
-IIC:
Acetylene (T2)
Hydrogen (T1)
,
6
Doc.No.IEX-BA-e-1412
