BUSCH COBRA ATEX NC 0100-0300 B, Instruction Manual

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2 | Product Description
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– The dilution gas ballast prevents the formation of condensates or dilutes them, de-
pending on the application. The nitrogen is fed into the cylinder.
– The purge gas system fitted at the inlet flange allows to flush the machine after use
or during operation. The nitrogen is fed into the inlet flange.
2.5 Accessories
NOTE
Depending on the ATEX classification of the machine, some of the following accessories
may be mandatory, see
ATEX Classifications and Associated Accessories [ ► 12] .
2.5.1 Gas Ballast Valve
The gas ballast valve mixes the process gas with a limited quantity of ambient air to
counteract the condensation of vapour inside the machine.
The gas ballast valve has an influence on the ultimate pressure of the machine, see Tech-
nical Data [ ► 55] .
2.5.2 Silencer
A silencer at the discharge connection (OUT) can be provided to reduce the exhaust gas
noise.
A non-return flap can be optionally added to the silencer.
2.5.3 Resistance Thermometer
The resistance thermometer monitors gas temperature. It can be installed at three differ-
ent places depending on the ATEX classification.
Warning and trip signals must be set, see Wiring Diagram Resistance Thermometer
[ ► 33] .
2.5.4 Pressure Transmitter
The pressure transmitter monitors the gas pressure at the discharge connection (OUT).
Warning and trip signals must be set, see Wiring Diagram Pressure Transmitter [ ► 34] .
2.5.5 Pressure Switch
The pressure switch monitors the gas pressure at the discharge connection (OUT). It can
be installed instead of the pressure transmitter.
The machine must be stopped when the gas reaches a certain pressure, see Wiring Dia-
gram Pressure Switch [ ► 34] .
2.5.6 Mechanical Seals
The sealing systems can be equipped with mechanical seals. The following variants are
possible:
– Oil lubricated single mechanical seals on the motor side and labyrinth seals on the
suction side.
– Oil lubricated single mechanical seals on the motor side and suction side.