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– Gas lubricated double mechanical seals on the motor side and oil lubricated single
mechanical seals on suction side.
The gas lubricated double mechanical seals require a pressure switch in order to monit-
ors if the gas pressure drops below the minimum allowable pressure. See
gram Pressure Switch (With Gas Lubricated Double Mechanical Seals Only) [
2.5.7 PTFE Shaft Seals
The sealing systems on the motor side can also be equipped with PTFE shaft seals.
2.5.8 Terminal box
The machine can be optionally equipped with one or two terminal boxes. All electrical
devices, except the motor, are already wired to the terminal box.
2.5.9 Flame Arresters
The flame arresters are safety devices. They do not prevent explosion but avoid the
propagation of a deflagration within the machine compression chamber to the up and
downstream lines of the system.
To avoid a loss of suction capacity through the flame arrester at the machine inlet, a by-
pass connection with a ball valve can be optionally delivered, see
2.6 Explanation of ATEX Classification
The ATEX classification is written on the nameplate of the machine (NP), see below a
marking example:
Inside (i)
Outside (o)
II 2G Ex h IIB T3 Gb X
II 2G Ex h IIB T3 Gb X
Explosion group inside the machine
Equipment category for explosive gases inside the machine
Equipment category for gas and dust outside the machine
Equipment group II (not for mining application)
Explosion protection inside the machine
Explosion protection outside the machine
Design approved according to ATEX Directive
Equipment group II (not for mining application)
Temperature class inside the machine
Equipment protection level
(T2=300°C) ; (T3=200°C) ; (T4=135°C)
Type of protection
Special conditions for operation*
Type of protection
Explosion group outside the machine
Temperature class outside the machine
Equipment protection level
Special conditions for operation*
* The specific operating conditions are determined in this instruction manual.
2.6.1 ATEX Nameplate
The machine has two different nameplates:
– A nameplate (NP1) is fixed on the base frame of the machine with the ATEX marking
inscription.
– A second nameplate (NP2) is fixed on the machine stage (module) identifying that
the stage is suitable for ATEX certified machine.
This allows the preservation of the machine ATEX certification if the machine stage
should be replaced.
Summary of Contents for COBRA ATEX NC 0100-0300 B
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