Problem
Possible causes
Remedy
Vacuum pump does not
reach the specified ulti-
mate pressure
● Measurement result dis-
torted
● Check the measurement instru-
ment.
● If necessary, check the ultimate
pressure without the vacuum sys-
tem connected.
● Vacuum pump or con-
nected accessory conta-
minated
● Clean the vacuum pump.
● Check the components for contami-
nation as required.
● Operating fluid contami-
nated
● Operate the vacuum pump with in-
ert gas over a longer period.
● Replace the operating fluid as re-
quired.
● Operating fluid level too
low
● Top up the operating fluid.
● Leak in system
● Locate and eliminate the leak.
● Vacuum pump is dam-
aged
● Contact Pfeiffer Vacuum Service.
Pumping speed of vacuum
pump too low
● The intake line is not
suitably dimensioned
● Make sure that connections are
short and cross sections adequate-
ly dimensioned.
● Exhaust pressure too
high
● Check exhaust line outlet opening
and exhaust side accessories.
Loss of operating fluid
● Casing seal is leaking
● Check and replace the seal.
● Loss of operating fluid
from normal operating
conditions – without oil
mist filter (OME)
● Install an OME.
● Loss of operating fluid
from normal operating
conditions – with oil mist
filter (OME)
● Clean the OME and ODK, or re-
place the filter.
Unusual noises during op-
eration
● Noise reduction is con-
taminated
● Remove the cap.
● Clean the silencer nozzle.
● If necessary, contact Pfeiffer Vac-
uum Service.
● Pumping system is con-
taminated or damaged
● Clean and maintain the vacuum
pump.
● If necessary, contact Pfeiffer Vac-
uum Service.
● Motor bearing is faulty
● Change the motor.
● If necessary, contact Pfeiffer Vac-
uum Service.
Tbl. 9:
Troubleshooting for rotary vane pumps
Malfunctions
48/58
