minimum. To add the oil, unscrew the oil-ll plug, add oil and screw the plug
rmly back in.
Open all valves blocking the exhaust lines. Do not operate the pump with a
blocked or constricted exhaust line.
Check the direction of rotation befor
e starting the pump for the rst time and
after each change in the electrical connection (refer to Electrical
connections on page 33).
On initial start-up, after prolonged idle periods or after an oil change, the
specied ultimate pressure cannot be attained until the oil is degassed.
This can be done by operating the pump for approximately 30 minutes with
the intake line closed and the gas ballast valve open.
7.3 Operation
Note:
The pump can pump condensable gases and vapours, provided that the
gas ballast valve is open and the pump has attained its operating
temperature.
If exhaust gases must be collected or contained, do not allow the exhaust
line to become pressurised. The pressur
e in the oil box must not exceed
0.5 bar(g). An exhaust line that is too small in diameter or which is blocked
can result in the formation of overpressure within the pump. The pump may
get damaged or burst if the pump is opened. Thus the exhaust line must be
checked from time to time to make sure that there are no obstructions.
7.3.1 Pumping of non-condensable gases
If the process contains mainly dry gases, the pump may be operated
without gas ballast (position 0), provided that the saturation vapour pressure
at operating temperature is not exceeded during compression.
If the composition of the mixture to be pumped is not known and if
condensation in the pump cannot be ruled out, operate the pump with dry
air or dry inert gas ballast (position I or II) in accordance with Pumping of
condensable gases and vapours on page 36.
35
300956027_002_A0 - 03/2022 - © Leybold
Operation
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