Installation and Operational Instructions for
ROBA
®
-ES Couplings Type 94_._ _ _._ Sizes 14
– 65
(B.9.6.EN)
11/03/2022 TK/GH/GC/MD
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Phone: +49 8341 804-0, Fax: +49 8341 804-421
Page 22 of 29
Guidelines and Directives for Operation in
Areas Where There is a Danger of Explosion
Classification of
Areas Where There is a
Danger of Explosion and Permitted Types
According to the Directive 2014/34/EU
For the implementation of the Directive, the ignition protection
type “c” (constructional safety) has been applied in accordance
with DIN EN ISO 80079-36/37/38 and the letter "h" has been
recorded in the classification.
Key designs:
Dimensioning according to the requirements shaft diameter,
transmittable torque and operating conditions must be carried out.
To do this, the corresponding user data must be known or the
user must carry out the dimensioning in accordance with the valid
calculation basis (e.g. DIN 6892) for key connections and the
permitted voltage values common in mechanical engineering.
For the calculation, please take the yield point Rp
0.2
= 200 N/mm
2
for aluminum and the yield strength R
e
= 350 N/mm
2
for steel.
During initial operation, please make sure that the key is inserted
correctly and that the coupling and the key are secured axially.
According to the described coupling combinations and if the
measures and guidelines described in the Installation and
Operational Instructions are observed, the ROBA
®
-ES is suitable
for use in areas where there is a danger of explosion according to
the category:
II 2G Ex h IIC
T4/T5/T6
-30°C
Ta
+80/60/45°C Gb
II 2D Ex h IIIC T
110°C
-30°C
Ta
+80/60/45°C Db
I M2 Ex h I Mb
Permitted Types: 94_.022._ / 94_.122._ / 94_.522._ / 94_.622._
If the frictionally-locking hub types listed below are designed with
additional key connections, they also accord with the category
described here.
Couplings with a frictionally-locking shaft-hub connection:
These designs are in the standard design suitable for application
in areas where there is a danger of explosion according to the
category:
II 3G Ex h IIC
T4/T5/T6
-30°C
Ta
+80/60/45°C Gc
II 3D Ex h IIIC T
110°C
-30°C
Ta
+80/60/45°C Dc
Permitted Types: 94_.000._ / 94_.100._ / 94_.500._ / 94_.600._
94_.001._ / 94_.101._ / 94_.501._ / 94_.601._
94_.002._ / 94_.102._ / 94_.502._ / 94_.602._
94_.011._ / 94_.111._ / 94_.511._ / 94_.611._
94_.012._ / 94_.112._ / 94_.512._ / 94_.612._
The values specified in Tables 1 to 4 for transmittable torques for
clamping hubs and shrink disk hubs must be observed.
In order to ensure torque transmission, an additional keyway can
be added with these designs.
In Table 15, the bore diameters for which a keyway is possible
are listed.
Furthermore, secure torque transmission is guaranteed if the
respective customer-side application constellation is checked as
to whether the torque transmission capability of the shaft-hub
connection can be sufficiently guaranteed (at least 1.5 to the
maximum torque on the system). This inspection must be
repeated at regular intervals during maintenance work (see
Maintenance).
In these conditions, coupling application is possible in the
following areas:
II 2G Ex h IIC
T4/T5/T6
-30°C
Ta
+80/60/45°C Gb X
II 2D Ex h IIIC T
110°C
-30°C
Ta
+80/60/45°C Db X
The X at the end of the classification refers to
the operating conditions for an inspection of the
transmission reliability of the frictionally-locking
shaft-hub connection.
Without this inspection, this classification is
rendered invalid.
Table 15
Type
Bore
[mm]
Size
14
19
24
28
38
94_._00._
d
min
6
10
15
19
20
d
max
15
20
28
35
45
94_._11._
d
min
6
10
15
19
20
d
max
12
18
22
32
36
Type
Bore
[mm]
Size
42
48
55
65
94_._00._
d
min
28
35
40
45
d
max
50
55
70
80
94_._11._
d
min
28
35
40
45
d
max
42
52
58
63