4.3 Switching on
The maximum starting pressure for the turbomolecular pump can be read
from the graph in Fig. 4.1.
Where Sf / V > 100[h
-1
], the forevacuum pump and the TURBOVAC can be
switched on simultaneously.
In such a situation the TURBOVAC serves from the very outset as an effective
baffle.
When dealing with larger volumes, the vacuum chamber will first have to be
pumped down with the forevacuum pump.
Then switch on the cooling and the TURBOVAC (at the frequency converter).
Kindly refer to the frequency converter operating instructions for details.
Avoid impact and vibration while the pump is running.
Exposure of the pump to accelerating forces must be avoided or reduced
to such an extent that the rotor unit will not be excited by vibrations. In the
case of critical applications you must consult our Applications Dept. first.
Starting pressure
NOTICE
10
3
10
2
10
1
10
0
mbar
h
-1
125
S
V
/V
Startdruck
0255075 100
S
f
= Pumping speed at the
forevacuum pump (m
3
/h)
V = Chamber volume (m
3
)
Starting pressure
Fig. 4.1 Determining the starting pressure for a TURBOVAC when evacuating larger volumes
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