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4.4. Pumping Off Dry Gases
No special measures are necessary. The gas ballast valve
may remain closed.
5. What To Do In Case Of Breakdown?
Problem Possible Causes Remedy
Pump doesn't attain final pressure Pump dirty Operate pump for a longer period with open
Operating fluid dirty gasballast valve or change operating fluid
Leak in system Repair leak
Unusual operating noises Damaged pump stages Request repair by Pfeiffer Vacuum Service
Damaged coupling piece Request repair by Pfeiffer Vacuum Service
Oil leaking from the foot of the pump Radial shaft seal defective Request repair by Pfeiffer Vacuum Service
Pump doesn't start Ambient temperature < 12 °C Warm up pump
Dirty pump stages Request cleaning by Pfeiffer Vacuum Service
Damaged pump stages Request repair by Pfeiffer Vacuum Service
Further repairs can only be carried out by trained specialists in accordance with Service Instructions.
Gasballast valve helium tight and corrosive gas models
4.5. Pumping Off Vapours
To prevent their condensation in the pump,
vapours should only be pumped off with the
pump at operating temperature and the gas
ballast valve 45 open.
Observe pump water vapour tolerance levels
(see Section 8.0 Technical Data). When the process has been
completed, allow the pump to continue running for approx. 30
minutes for operating medium cleaning purposes.
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