GA 02.200/8.02 - 10/02
Operation
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The pressure in the exhaust line must be greater than
500 mbar (abs.) so that the pressure differential (in rela-
tion to the pumping chamber) needed for lubrication is
maintained. It must, however, remain below 1300 mbar
(abs.) during operation to avoid damage to the seals of
the pump.
2.4 Start-up
The pumps are supplied with the necessary oil charge in
ready-to-use condition.
The oil level of the pump can only be checked properly
when the pump is running. It must then be in the middle
of the oil-level sight glass (7/3).
The pump is designed for perfect start-up at temperatu-
res over 12 °C as per PNEUROP.
Each time after switching the pump on, the
oil level must be checked.
2.5 Operation
Rotary piston pumps can attain surface
temperatures in excess of 80 °C.There thus
exists the danger of receiving burns.
Note the warnings as to potential dangers given on the
pump.
The rotary piston pumps can pump gases and vapours.
To pump vapours, the gas ballast valve must be open
and the pump must have reached its operating tempera-
ture.
2.5.1 Pumping of Non-Condensable Gases
If the pump system contains mainly permanent gases,
the pump can be operated without gas ballast, provided
that the saturation vapour pressure at operating tempe-
rature is not exceeded during compression.
If the composition of the gases to be pumped is not
known and if condensation in the pump cannot be ruled
out, we recommend that the pump be operated pursuant
to Section 2.5.2 with the gas ballast valve open.
2.5.2 Pumping of Condensable Gases and
Vapours
With the gas ballast valve open and at operating tempe-
rature (approx. 70 °C - 95 °C), the rotary piston pump
can pump pure water vapour up to the values indicated
in the Technical Data.
The gas ballast valve is opened manually (7/2).The run-
ning noise of the pump is slightly louder if the gas ballast
valve is open.
When vapours are pumped, ensure that the pump has
run up for approx. 15 min. with closed intake line and with
gas ballast.
Only when the pump has attained its opera-
ting temperature can vapour be pumped off
up to the permissible limit .
One sign of condensation of vapours in the pump is a
rise in the oil level during operation of the pump. At the
same time the oil gets turbid, for example by the uptake
of water.
When vapours are pumped, the pump must not be swit-
ched off immediately upon completion of the process
because the condensate dissolved in the pump oil may
cause corrosion.To prevent this, the pump must continue
to operate with open gas ballast valve and closed intake
line until the oil is free of condensate. It is advisable to
allow the pump to operate in this mode for at least 30
min. after completion of the process.
When pumping vapours do not use an AFK
1/2. It is better to use an external AF 100-
250.
In cycle operation, the pump should not be
switched off during the intervals between
the individual working phases, but should
continue to run (with low power consumpti-
on at ultimate pressure) with gas ballast
valve open and inlet port closed (if possible
via a valve).
Once all vapours have been pumped off from a process
(e. g. during drying), the gas ballast valve can be closed
in order to improve the attainable ultimate pressure.
Caution
Warning
Warning
Caution
Caution
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