5.52.185.01.01.02
9
Temperature
class
Ignition tem-
perature of gas
°C
max. surface
temperature of the
operating material in
°C
T1
>450
450
T2
>300 <450
300
T3
>200 <300
200
T4
>135 <200
135
T5
>100 <135
100
T6
>85 <100
85
2.6.3
EX zone classification
Areas that are prone to explosion are classified into zones. The owner must determine the zone that exists.
Information on the zone classification can be found in IEC 60079-10 and in national standards. The following
table contains an overview of the zone classification in combination with the device category.
Gases
Vapours
Mist
device category
(Gases)
Dust
device category
(dust)
explosive
atmosphere
is present
Zone 0
1G
Zone 20
1D
continuously, long-term or
frequently
Zone 1
2G
Zone 21
2D
occasionally
Zone 2
3G
Zone 22
3D
rarely or short-term
