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ARPEX 8704 en
Operating instructions 01/2019
5.2
Marking of the coupling parts for use in potentially explosive zones
Couplings which are ordered in ATEX configuration, have the following marks on the outer circumference
of one of the coupling part (e.g. on the hub):
Flender GmbH
II 2G Ex h IIC T6 … T2 Gb X
D 46393 Bocholt
II 2D Ex h IIIC T85 °C … 250 °C Db X
ARPEX <year built>
I M2 Ex h Mb X
All component parts must also be marked
(in the case of small components, if necessary, the
packaging only need be marked).
If, in addition to the CE mark, the letter
"U"
together with the Flender order number has been stamped on,
the coupling part has been delivered by Flender un or prebored.
Flender supplies unbored and prebored couplings with CE marking only under the
condition that the customer assumes the responsibility and liability for correct
refinishing in a declaration of exemption.
5.3
Operating conditions in potentially explosive areas
The machines connected by the coupling must be earthed by an earth leakage
resistance < 10
6
Ω.
If coated couplings are used in potentially explosive areas, the requirements made of
the conductivity of the coating and the limitation on the thickness of the coat applied
must be observed in accordance with standard "DIN EN 80079-36". Where coatings
have a thickness less than 200 μm, no electrostatic charge is to be expected.
If they are to be used below ground in potentially explosive areas the couplings must
only be used with drive motors, which can be switched off on occurring of an
explosible atmosphere.
•
Equipment group I (underground applications, mining)
─ Category M2 (coupling is
not approved
for equipment category M1).
•
Equipment category II (use above ground, industry)
─ Categories 2 and 3 (coupling is
not approved
for equipment category 1).
─ Material group G (areas, in which there are explosible gas, vapour, mist, air mixtures),
zones 1 and 2 (coupling is
not approved
for use in zone 0).
─ Material group D (areas where dust can form explosible atmospheres),
Zones 21 and 22 (coupling is
not approved
for equipment category 20).
─ Explosion group IIC (Explosion groups IIA and IIB are included in IIC).
─ The permissible temperature classes and/or maximum surface temperatures are assigned as
a function of the maximum ambient temperature occurring in the immediate vicinity of the coupling
(see table 2).
Table 2:
Temperature classes
Ambient temperature
Temperature class
Max. surface temperature
- 40 °C up to max. + 230 °C
T2
< 280 °C
- 40 °C up to max. + 150 °C
T3
< 200 °C
- 40 °C up to max. + 85 °C
T4
< 135 °C
- 40 °C up to max. + 50 °C
T5
< 100 °C
- 40 °C up to max. + 35 °C
T6
<
85 °C
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