The service 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 number (applies to mineral
oils only).
7.4.1 Determine the 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
Prerequisites
● Vacuum pump switched off
● Vacuum pump is vented to atmospheric pressure on the suction side
● Vacuum pump cooled
Required aids
● Test tube
● Pipette with flexible hose
● Allen key,
WAF 8
● Calibrated torque wrench (tightening factor ≤ 2.5)
Determine degree of aging of P3 operating fluid
1. Unscrew the filler screw.
– Be careful with the O-ring.
2. Use the pipette to extract a sample of the operating fluid from the filling port.
3. Pour the sample into a test tube.
4. Check the sample in bright light.
5. If it is a reddish-brown color at the latest (corresponding with color identification number 5),
change the operating fluid.
6. Screw in the filler screw.
– Be careful with the O-ring.
– Tightening torque:
6 Nm
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.
Maintenance
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