5.52.653.01.01.05
7
2.6
Explosion protection
The EX classification of the unit is indicated on a
separate plate, situated on the unit.
Illustration 1
Example of ATEX classification:
II
2
G
Ex h IIB
T4
Gb
CE-marking
European Union
explosion-proof operating material
II
device group / application
I
II
danger of mine damp
other areas prone to explosion
2
device category
1
2
3
for use in zone 0
for use in zone 1
for use in zone 2
G
EX atmosphere
G
D
...caused by gas, steam, fog
...caused by dust
Ex h
type of protection
for mechanical devices, including e. g.
“c” construction safety
“k” encapsulation of liquids
IIB
explosion group II (gases)
IIA
IIB
IIC
limit gap widths (MESG) > 0,9 mm
limit gap widths (MESG) ≤ 0,9 to ≥ 0,5 mm
limit gap widths (MESG) < 0,5 mm
T4
Temperature class - gases
(for dust only the temperature in °C
is stated)
T1
T2
T3
T4
T5
T6
limit temperature 450 °C
limit temperature 300 °C
limit temperature 200 °C
limit temperature 135 °C
limit temperature 100 °C
limit temperature 85 °C
Gb
EPL (equipment protection level)
Ga
Gb
Gc
e.g. Group II (for gases, vapours, mist):
level of protection: very high (complies with zone 0)
level of protection: high (complies with zone 1)
level of protection: enhanced (complies with zone 2)
2.6.1
EX-Category
EX - Zone
1+21
2+22
1+21
2+22
Device category
2
2
Expl.-group of gases
Expl.-group of dust
IIB
IIIA
IIB
IIIA
Temperature class - gases
Temperature class - dust
T4
T135°C
T3
T200°C
