Labelling of explosion-proof equipment
ATEX
The compressor area of application is indicated next to the Ex-sign on the name plate.
II
Material group:
II indicates that the equipment is suitable for use in industrial areas above
ground.
2
Material category:
2 indicates that the equipment is suitable for use in areas with possible
occurrence of explosive gasses.
G
Hazardous environment:
G indicates that the equipment is suitable for use in potentially explosive gas,
vapour, and fog atmospheres.
T3/T4
Temperature class:
Indicates the surface temperatures that may occur on the compressor.
WARNING
On ATEX-executions, the limits in
must always be respected.
Table 7: Temperature classes - screw compressors
Temp. class
Max. surface temp.
Max. temperature of
oil to shaft seal
Min. ignition
temperature of oil
T1
450°C
380°C
500°C
T2
300°C
230°C
350°C
T3
200°C
130°C
250°C
T4
135°C
65°C
185°C
T5
100°C
30°C
150°C
T6
85°C
15°C
135°C
23
SAB 283-355 A-Frame OHU 6042 and OHU 7650 (including ATEX) Screw Compressor Unit
