7.4.2 Changing the operating fluid
WARNING
Health hazard and risk of environmental damage from toxic contaminated operating fluid
Toxic process media can cause operating fluid contamination. When changing the operating fluid,
there is a health hazard due to contact with poisonous substances. Illegal disposal of toxic substan-
ces causes environmental damage.
► Wear suitable personal protective equipment when handling these media.
► Dispose of the operating fluid according to locally applicable regulations.
CAUTION
Scalding from hot operating fluid
Danger of burns when draining operating fluid if it comes into contact with the skin.
► Wear protective equipment.
► Use a suitable collection receptacle.
Cleaning by changing the operating fluid
Pfeiffer Vacuum recommends, in cases of heavy contamination with process residues,
cleaning the inside of the vacuum pump with several operating fluid changes.
Prerequisites
● Vacuum pump switched off
● Vacuum pump vented to atmospheric pressure
● Vacuum pump has cooled so that it can be touched
● Operating fluid still warm
7
2
1
3
6
5
4
Fig. 13:
Draining the operating fluid
1 Filler screw
5
Drain screw
2 O-ring
6
O-ring
3 Drain hole
7
Sight glass
4 Collection vessel
Required consumables
● Operating fluid of the vacuum pump
Required tools
● Allen key,
WAF 5
● Calibrated torque wrench (tightening factor ≤ 2.5)
Maintenance
37/62
