Potential
hazard
Occurrence due to
Safety measures
Electrical
sparks
Electric motor
Application of an explosion-proof electric motor. Observe
the labeling (refer to rating plate) of the electric motor and
the operating instructions.
Static elec-
tricity
Rotary vane pump is not
earthed
Rotary vane pump is to be integrated in the equipotential
bonding at the installation site. Static charging from insu-
lating coats of paint can be excluded as the rotary vane
pump is not painted.
Chemical
reaction
Reaction between proc-
ess gas and operating
fluid
To be assessed by the user.
Zone en-
trainment
Leaking rotary vane
pump/system
Rotary vane pump undergoes a final inspection with heli-
um leak test within the framework of a production control
(leakage rate < 1 × 10
-8
Pa m
3
/s).
Tbl. 4:
Potential hazards
2.4.3 Safety measures
The following information must be observed or appropriate measures implemented if reliable operation
of the rotary vane pump is to be guaranteed:
Measures/safety equipment
Speci-
fica-
tion
We
recom-
mend
Oil pres-
sure
Monitoring of oil pressure with oil pressure switch (optional):
● Falling below the switch-point will cause a malfunction of the
vacuum safety valve.
● Exceeding the switch-point could indicate an overload of the
magnetic coupling.
X
Exhaust
pressure
Monitoring of the exhaust pressure with pressure switch (optional)
to protect the rotary vane pump against overload.
X
Operating
fluid tem-
perature
Monitoring of the operating fluid temperature with temperature sen-
sor (optional):
● A deviation from the normal value could be indicative of a fault.
X
Operating
fluid level
Monitoring of the operating fluid level with level switch (optional):
● If the fill level falls below the "Min" mark, opening of the
change-over contact can be used as a signal to switch off the
rotary vane pump.
X
Motor wind-
ing temper-
ature
Connect the temperature sensor in the motor terminal box on the
PTC thermistor tripping unit
(see chapter “Connecting the PTC
thermistor tripping unit”, page 30)
as prescribed in the motor op-
erating instructions.
X
Tbl. 5:
Measures and safety equipment
Safety
17/58
