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BA 5030 en 02/2013
1.2 Marking of the gear unit designed in accordance with Directive 94/9/EC
Table 1: ATEX identification
Equip
ment
group
Equipment
category
1
)
"Ex"
atmosphere
Explosion
group
2)
Tempera
ture class
3)
Identification marking
5)
II 2, 3
Gas (G) IIA, IIB, IIC T3, T4
II 2 G IIA T4 bck T
a
..
4)
Gas (G)
and
dust (D)
IIA, IIB, IIC T3, T4
II 2 G IIA T4 D 120 °C bck T
a
4)
1)
Always only one equipment category can be indicated.
2)
The explosion groups relate to the gaseous atmosphere (G).
Always only one explosion group can be indicated.
3)
Always only one temperature class can be indicated.
4)
T
a
min.
≤ T
a
≤ T
a
max.
= permissible ambient temperature range in °C:
T
a
min.
= minimum permissible ambient temperature
T
a
max.
= maximum permissible ambient temperature
T
a
= symbol for ambient temperature in °C
5)
The indications relating to equipment category, explosion group and temperature class are to be
understood as an example.
With gear units without electrical explosion hazard monitoring device (such as temperature, oil
level) no ignition protection "b" is available.
The rating plate on the gear unit indicates the marking for the applicable case of
application.
1.2.1 Ambient temperature
The specifications of Directive 94/9/EC apply to the ambient temperature range of from 20 °C to + 40 °C.
By adopting various suitable measures the gear unit may be used at ambient temperatures of
between 40 °C and + 60 °C. However, this must always be approved by Siemens.
In individual cases the permissible ambient temperature range specified on the rating plate always applies.
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