7.3 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.
Pfeiffer Vacuum recommends determining the precise service life of the operating
fluid in the first operating year.
The service life may deviate from the reference value specified depending on thermic and
chemical loads, and the accumulation of suspended particles and condensate in the oper-
ating fluid.
Operating fluid type
Fundamentally, when filling, refilling, or changing operating fluid, you must always use the
operating fluid type specified on the rating plate. Should process conditions change, you
can convert to a different operating fluid type.
Safety data sheets
You can obtain the safety data sheets for operating fluids from Pfeiffer Vacuum on request,
or from the
Pfeiffer Vacuum Download Center
The usable life of operating fluid is dependent on the area of application of the rotary vane vacuum
pumps.
Instructions for when operating fluid should be changed
● The vacuum pump does not reach the specified ultimate pressure.
● Operating fluid is perceptibly polluted, milky, or cloudy when viewed through the sight glass.
● It is possible to detect thermal aging of the operating fluid from its color identification number (ap-
plies to mineral oils only).
7.3.1 Determine degree of aging of P3 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.
You can determine the degree of aging of P3 operating fluid in clean processes using the color chart (in
accordance with DIN 51578). The supplementary sheet with the document number PK0219 can be ob-
tained from the
Pfeiffer Vacuum Download Center
Maintenance
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