Required consumables
●
Operating fluid of the vacuum pump
Fig. 13: Refilling operating fluid
1 Filler screw 2 O-ring
Refill operating fluid during operation
Operating fluid can be refilled during operation in the final vacuum.
Procedure
1. Unscrew the filler screw.
2. Refill with operating fluid up to the top marking before the minimum fill level is reached.
3. Screw in the filler screw again.
–
Be careful with the O-ring.
–
Tightening torque: 0.3 Nm
6.5 Switching off vacuum pump
NOTICE
Contamination from operating fluid backflow
After the vacuum pump is switched off, there is a risk that the connected vacuum system can become
contaminated by backflow. The safety valve on the vacuum pump is not suitable for longer-term seal-
ing.
►
Install an additional shut-off valve in the intake line.
►
Shut off the intake line immediately after switching off the vacuum pump.
NOTICE
Contamination of the vacuum chamber from operating fluid backflow
After the vacuum pump is switched off, there is a risk that the connected vacuum system can become
contaminated by backflow.
►
Vent the vacuum chamber, regardless of its size, within 30 seconds.
►
Shut off the intake line with an additional shut-off valve, after the vacuum pump is switched off
during longer venting operations.
Pfeiffer Vacuum rotary vane pumps have an integral vacuum safety valve on the intake side. The vac-
uum safety valve automatically closes from a differential pressure of ≥250 hPa between the exhaust
and intake sides, when the vacuum pump is switched off, and vents the vacuum pump.
Operation
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