Explosion Protection - HADEF 19/90 Installation, Operating And Maintenance Instructions
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Use of different EX-zones is depended from the EX-classification of the unit. Find the EX-classification on its
type plate.
Unit classified
in EX-classification
3G/D
2G/D
2.6
Explosion protection
The EX classification of the unit is indicated on a
separate plate, situated on the unit.
Example of ATEX classification:
CE-marking
explosion-proof operating
material
II
device group / application
2
device category
G
EX atmosphere
Ex h
type of protection
IIB
explosion group
Temperature class - gases
T4
(for dust only the tempera-
ture in °C is stated)
Gb
EPL (equipment protection level)
5.52.653.01.01.04
No use
in EX-zone
0,20,1,21
0,20
3G
0,20,1,21,22
3D
0,20,1,21,2
2G
0,20,21,22
2D
0,20,1,2
II
2
G
Ex h
European Union
I
danger of mine damp
II
other areas prone to explosion
1
for use in zone 0
2
for use in zone 1
3
for use in zone 2
G
...caused by gas, steam, fog
D
...caused by dust
for mechanical devices, including e. g.
"c" construction safety
"k" encapsulation of liquids
IIA
limit gap widths (MESG) > 0,9 mm
IIB
limit gap widths (MESG) 0,9 >= 0,5 mm
IIC
limit gap widths (MESG) < 0,5 mm
T1
limit temperature 450 °C
T2
limit temperature 300 °C
T3
limit temperature 200 °C
T4
limit temperature 135 °C
T5
limit temperature 100 °C
T6
limit temperature 85 °C
e.g. Group II (for gases, vapours, mist):
Ga
level of protection: very high (complies with zone 0)
Gb
level of protection: high
Gc
level of protection: enhanced (complies with zone 2)
Illustration 1
IIB
T4
(complies with zone 1)
Gb
7
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