Pfeiffer Vacuum Penta 10, Translation Of The Original Operating Instructions

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17
Operation
6.3 Pumping condensable vapours
Should the process gases contain condensable gases present at high percentages,
the rotary vane pump must be operated with a gas ballast (i.e. with an open gas
ballast valve).
Gas ballast valve,
standard version
To avoid condensation in the pump when pumping condensable vapours, air is pe-
riodically fed into the working chamber at the beginning of the compression phase
via the gas ballast valve 161.

Open gas ballast valve; to do so, turn cap 43 on the gas ballast valve 161 so that
the two holes line up.
Fig. 12: Operation with gas ballast valve 161
Temperature control
mode
Operating the pump in temperature control mode will further improve the dis-
charge of liquids when pumping large volumes of condensable vapours. The fan
is temporarily switched off to increase the operating temperature of the pump.

Open gas ballast valve; to do so, turn cap 43 on the gas ballast valve 161 so that
the two holes line up.

Bridge Pin 2 and Pin 3 at remote connection 50.1 to switch on the temperature
control mode;
– use customized remote plug (see p. 27, chap. 12) .
CAUTION
Bad final vacuum and damage to the pump!
Danger of condensation and corrosion due to exceeding the water vapour compatibi-
lity (see Technical data) during operation without a gas ballast or in case of insufficient
supply of flushing gas.

Only pump vapours when the pump is warm and the gas ballast valve is open.

When the process has been completed, allow the pump to continue running for
about 30 minutes with the vacuum flange closed and the gas ballast open for ope-
rating fluid regeneration purposes.
161