KERN & SOHN OEX - Manual (Page 7)

5 ATEX marking – meaning of icon
• The balances of the OEX series meet the requirements of group II,
class 2 for devices in as per Directive 94/9/EU and are marked as -
II 2 G IIC T4.
Icon declaration as per Directive 94/9/EG:
The balances of the OEX series are intended for indoor and outdoor use. However,
they should not be exposed to aggressive chemical vapours, critical temperatures
and high humidity. The platform balance construction is made of stainless steel.
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
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,
Electrical
equipment –
compatible with
one or few types
of explosion
protection
constructions
Gas explosivity group -
Examples:
-IIA: Propane (T1)
Benzene (T3)
Butane (T2)
Ethyl alcohol (T2)
-IIB: Ethylene (T2)
-IIC: Acetylene (T2)
Hydrogen (T1)
,
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
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