Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
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008831 en 2022.02
Signs and warnings
2.5 Labelling of explosion-proof equipment
ATEX:
The compressor area of application is indicated next to the Ex-sign on the name plate.
II 2 G T3/T4
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 Table 2 must always be respected.
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
Table 2: Temperature classes - screw compressors
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