Pfeiffer Vacuum OKTA 8000 G Betriebsanleitung Seite 91

6.4 Flushing the suction chamber
Property damage from impermissibly high pressure build-up in the suction chamber
Exceeding the specified flushing quantities damages the vacuum pump.
► Observe the maximum permissible flushing quantities at max. 3000 hPa.
► Fully purge all supplied fluid.
► Observe the vapor compatibility of the downstream vacuum pumps.
If the extracted medium polymerizes or becomes deposited in the suction chamber, a continuous or dis-
continuous flushing of the suction chamber can be performed during operation.
Procedure
1. Consider the components in contact with a medium when selecting a solvent compatible with the
2. Select the max. permissible flushing quantity according to the below table.
3. Set the desired flushing quantity at the inferential meter.
4. After flushing, sufficiently dry the vacuum pump on the inside.
Pump type
Okta 500 G
Okta 1000/1500G
Okta 3000/4000 G
Okta 8000 G
Tbl. 7:
6.5 Switching off and venting
Risk of crushing on rotating parts when reaching into the open flange
The pistons continue to run in the vacuum after switching off the motor, and can trap fingers and
hands within their reach.
► Wait until the vacuum pump comes to a complete standstill.
► Secure the vacuum pump against re-start.
Property damage from impermissibly high sealing gas pressure
Excessive sealing gas pressure leads to damage to the seals after switching on the vacuum pump.
► Make sure that the sealing gas pressure inside the pump does not exceed 1200 hPa.
► Stop the sealing gas supply immediately after switching off the vacuum pump.
Procedure with clean processes
You can switch off the vacuum pump in every pressure range, between atmospheric pressure and ulti-
mate pressure directly after the process end.
1. Close the shut-off valve in the vacuum line and disconnect the vacuum pump from the process.
2. Switch off the vacuum pump.
3. Vent the vacuum pump via the intake side.
4. Make sure that you do not vent the vacuum chambers through the vacuum pump.
5. Switch off the process- and pump-specific media supply (e.g. the sealing gas supply).
process medium.
– Components contained in the suction chamber are cast iron and steel. Seals are FPM.
– For pumping stations without intermediate condenser or collection receptacles, the smallest
vacuum pump in the pumping station determines the fluid quantity.
Max. permissible flushing quantity
WARNING
NOTICE
max. flushing quantity
0.5 l/min
1.0 l/min
1.5 l/min
2.0 l/min
NOTICE
Operation
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