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2.3.3 Monitoring Devices
The machine is equipped with several monitoring devices to visualise the operating val-
ues, machine conditions and to protect the machine from any severe damage.
The oil temperature, oil level, inlet gas pressure and counter pressure at the discharge
can be displayed when the machine is running, see Monitoring [►31].
Two signal levels are transmitted, a warning and an alarm/trip, see Warning and Alarm
Signals.
2.3.4 I/O and Communication Port
The control unit (CU) is equipped with two types of communication port that can allow
remote control of the machine:
– D-Sub 9 (Analog and Digital)
– RJ45 (Modbus)
• Refer to the specific document “Pump Control Instructions, art. no.: 0870213261” for
more details or contact your Busch representative.
2.3.5 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 [►52].
2.4 Optional Accessories
2.4.1 Inlet Filter
The inlet filter protects the machine against dust and other solids in the process gas. The
inlet filter is available with a cartridge.
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