High Vacuum Flange Connection; Fore-Vacuum Pump Connection; Pump Used In Presence Of Magnetic Fields; Orderable Parts - Varian Turbo-V 2K-G Mode D'emploi

HIGH VACUUM FLANGE CONNECTION

To connect the Turbo-V 2K-G pump to the ISO F
inlet flange position the integrated inlet screen -
centering ring as shown in the figure.
INLET SCREEN
Then fix the two flanges with the bolts as shown in
the following figures. (according to Norm ISO 1609)

FORE-VACUUM PUMP CONNECTION

A flange KF 40 NW is available to connect the
Turbo V2K-G pump to the fore-vacuum pump. A
hose or vacuum approved pipe can be used. If a
rigid pipe is used, any vibration generated by the
mechanical pump must be eliminated through the
use of bellows.
NOTE
The Turbo-V 2K-G pump is characterized by its
high compression ratio also for oil vapors. When
using a mechanical oil-sealed pump, it is advisable
to install a suitable trap between the turbopump
and the fore-vacuum pump in order to prevent oil
backstreaming.
PUMP USED IN PRESENCE OF MAGNETIC
FIELDS
Magnetic fields induce eddy currents in the rotor of
a turbomolecular pump that tend to oppose to its
rotation.
The result is increased electrical power consump-
tion by the motor, most of which is dissipated in
the rotor.
Since the rotor is not in contact with the stator the
above power can leave the rotor mainly by radia-
tion and hence the rotor may be overheated while
static parts of the pump remain cool.
This effect is strongly dependant from the inten-
sity, time function and distribution of the magnetic
field.
In general, therefore, an increase in pump current
can be expected.
If this increase is lower than 50% of the current
value drawn by the motor in high vacuum opera-
tion, no particular problem should be expected.
However if the effect is greater, than the case
should be carefully reviewed by Varianís specialist.
As a matter of fact, in case of high magnetic fields,
also important forces might be generated and ap-
plied to the rotor.

ORDERABLE PARTS

DESCRIPTION
Turbo-V 2K-G system with Monitorr op-
tion
Turbo 2K-G with ProfiBus and MoniTorr
options
Mains cable NEMA Plug, 3m long
Mains cable European Plug, 3m long
Serial cable and Navigator Software 3.0
Protocol Converter RS-232 <-> RS-485
wire
Inlet screen ISO 250 with center ring
Water cooling kit for 6x8 (IDxOD) flexible
tube
Water cooling kit for 3/8 in. ID flexible
tube
MoniTorr Connectivity kit
95
TECHNICAL INFORMATION
PART NUMBER
969-8871
969-8873
969-9958
969-9957
969-9883
969-9258
969-9138
969-9348
969-9338
969-9260
87-900-968-01(C)