Siemens Flender H2NV Series, Assembly And Operating Instructions Manual, Page: 9 / 62

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BA 5060 EN 04/2011
1.2 Marking of the gear units in design in accordance with Directive 94/9/EC
Table 1: ATEX identification
Equip­
ment
group
Equipment
category
"Ex"
atmosphere
Explosion
group
1)
Tempera­
ture class
2)
Identification marking
3)
II
3 Gas (G) IIA, IIB, IIC T3
II 3 G IIA T3 bckT
a
..
4)
1)
The explosion group relates to the gaseous atmosphere (G).
Always only one explosion group can be indicated.
2)
The temperature class relates to the gaseous atmosphere (G).
3)
The explosion group is indicated as an example.
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
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.
1.3 Measuring­surface sound­pressure level
The measuring­surface sound level of the gear unit at a distance of 1 metre can be found in the technical
data sheet supplied separately.
The measurement is carried out to DIN EN ISO 9614 Part 2, using the sound­intensity method.
The workplace of the operating personnel is defined as the area on the measuring­surface at a distance
of 1 metre in the vicinity of which persons may be present.
The sound­pressure level applies to the warmed­up gear unit at input speed n
1
and output power P
2
stated
on the rating plate. If several figures are given, the highest speed and power values apply.
The measuring­surface sound­pressure level includes add­on lubrication units, if applicable. With
outgoing and incoming pipes, the interfaces are the flanges.
The sound­pressure levels stated in the table were obtained by statistical calculation by our Quality Control
Dept. The gear unit can be statistically expected to comply with these sound­pressure levels.