Pump Used In Presence Of Magnetic Fields; Accessories - Varian Turbo-V 1000 ICE Manual De Instrucciones

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
consumption by the motor, most of which is dissi-
pated 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 func-
tion 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 operation, 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, ISO 200
Heating jacket
Water cooling kit for American frac-
tional tubes
Water cooling kit for Metric tubes
Pump to controller cable
Vent flange NW 10 KF (M8)
Vent valve with fixed delay time
Vent device with adjustable delay
time
Solid state flowmeter 1/4"
Swagelock
Solid state flowmeter KF16
Forepump DS 402, with 1 ph. / 3
ph., universal motor
Triscroll Dry Vacuum Pump PTS
300 single phase, universal motor
Triscroll Dry Vacuum Pump PTS
300 3 phase, universal motor
Forepump MD 60, 120 V
Forepump MD 60, 220 V
For a complete overview of Varian's extensive
product lines, please refer to the Varian catalog.
35
TECHNICAL INFORMATION
PART NUMBER
969-9316
969-9819
969-9338
969-9348
969-9953
969-9108
969-9833
969-9831
969-9114
969-9115
949-9382
PTS03001UNIV
PTS03003UNIV
949-9411
949-9412
87-900-900-01(C)