Pfeiffer DUO 3 - Operating with gas ballast

NOTICE
Risk of damage to the drive from increased motor current consumption
At an intake pressure of approximately 300 hPa and under unfavorable operating conditions (such as
for example exhaust side counterpressure), the power input exceeds the rated current.
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Limit the maximum power input of 1.5 times the rated current to max. 2 minutes (in accordance
with EN 60034-1).
Cycle operation
Cycle operation with maximum 10 cycles per hour is possible.
Longer operating phases and short downtimes permit a functionally safe operating condi-
tion of the vacuum pump.
Operating conditions
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The optimal operating condition of the vacuum pump is continuous operation.
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When pumping down dry gases, no special precautions are required.
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Low final pressures are possible with the gas ballast valve closed.
Switching on vacuum pump
1. If required, switch vacuum pump on in each pressure range.
2. Switch the vacuum pump on at the mains switch.
3. Allow the vacuum pump to warm up prior to process start, with the vacuum connection closed, for
approx. 30 minutes.
Checking operating fluid level
1. Regularly check operating fluid level while vacuum pump is running and at operating temperature.
2. Make sure that the fill level is within the markings on the sight glass frame.
3. Check operating fluid fill level daily during continuous operation, and every time vacuum pump is
switched on.
6.3 Operating rotary vane pump with gas ballast
NOTICE
Risk of damage from condensation in vacuum pump
During operation without gas ballast, condensation may form as a result of the vapor compatibility of
the vacuum pump being exceeded.
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Pump condensable vapors only when the vacuum pump is warm and the gas ballast valve open.
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Allow the vacuum pump to run on after process end for another 30 minutes with the gas ballast
valve open.
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This cleans the operating fluid and protects the vacuum pump against corrosion.
The gas ballast valve supplies air to the working chamber of the vacuum pump periodically at the begin-
ning of the compression phase. When pumping down vapors, this air prevents condensation within cer-
tain limits in the vacuum pump.
Behavior with process gases with condensable vapors
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Operate the vacuum pump with gas ballast, i.e. with the gas ballast valve open.
6.3.1 Gas ballast valve - standard version
No intermediate settings possible
An intermediate setting between open and closed is not possible.
The gas ballast valve supplies air to the working chamber of the vacuum pump periodically at the begin-
ning of the compression phase. When pumping down vapors, this air prevents condensation within cer-
tain limits in the vacuum pump.
Operation
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