Moving The Gas Purge Valve And Forevacuum Pump Connections; Pump Used In Presence Of Magnetic Fields; Accessories - Varian 969-9059 Serie Mode D'emploi

MOVING THE GAS PURGE VALVE AND
FOREVACUUM PUMP CONNECTIONS
All the pneumatic connections to the Turbo-
V2000HT pump can be moved to its bottom (see
the following figure).
To move the gas purge valve to the bottom of the
pump make the following steps:
1. Unscrew the gas purge valve from the side of
the pump
2. Unscrew the purge port cover on the bottom of
the pump and screw it on the side
3. Screw the gas purge valve (with a torque of 2.5
Nm) in the bottom of the pump.
To move the forevacuum pump flange to the bot-
tom of the pump make the following steps:
1. Unscrew the three screws that fix the forevac-
uum blank flange to the bottom of the pump
2. Unscrew the three screws that fix the forevac-
uum flange to the side of the pump
3. Fix the forevacuum flange to the bottom of the
pump using the relevant three screws
4. Fix the forevacuum blank flange to the side of
the pump using the relevant three screws.
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 intensity, time function
and distribution of the magnetic field. In general,
therefore, an increase in pump current can be ex-
pected.
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 grater, than the case
should be carefully reviewed by Varian's specialist.
As a matter of fact, in case of high magnetic fields,
also important forces might be generated and ap-
plied to the rotor.

ACCESSORIES

DESCRIPTION
Inlet screen
Water cooling kit
Plastic water cooling kit
Vent flange NW 10 KF (M8)
Vent valve with fixed delay time
Vent device with adjustable delay
time
Heavy duty vent valve
Purge valve KF16-M12 10 SCCM
Purge valve 7/16-M12 10 SCCM
Purge valve KF16-M12 20 SCCM
Purge valve 7/16-M12 20 SCCM
Triscroll Dry Vacuum Pump PTS
600 single phase, universal motor
Triscroll Dry Vacuum Pump PTS
600 3 phase, universal motor
Dual stage rotary vane pump DS
602 with single phase motor
Dual stage rotary vane pump DS
602 with 3 phase motor
For a complete overview of Varian's extensive
product lines, please refer to the Varian catalog.
34
TECHNICAL INFORMATION
PART NUMBER
969-9350
969-9338
969-9348
969-9108
969-9843
969-9831
969-9842
969-9239
969-9240
969-9241
969-9242
PTS06001UNIV
PTS06003UNIV
949-9335
949-9336
87-900-969-01