Pump Used In Presence Of Magnetic Fields; Accessories And Spare Parts; Vent Valve Model Selection Table - Varian Turbo-V 81-M Bedienungshandbuch

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 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 AND SPARE PARTS

DESCRIPTION
Inlet screen, DN 40
Inlet screen, DN 63
Heater band 220 V
Heater band 120 V
Metallic water cooling kit
Plastic water cooling kit
Air cooling kit (0.5 m cable)
Air cooling kit extension cable (5 m)
Pump extension cable
Vibration damper DN 63
Vibration damper CFF 4.5"
Mechanical pump DS 102
Mechanical pump DS 42
Dry scroll SH 100
Rack controller 81-AG base
Rack controller 81-AG RS232/485
Rack controller 81-AG Profibus
PCB 24 V
For a complete overview of Varian's extensive
product lines, please refer to the Varian catalog.

VENT VALVE MODEL SELECTION TABLE

CONTROL UNIT MODEL
Turbo-V 70 Rack controller
(P/N 969-9405, 969-9505)
V70 Navigator
(P/N 969-8970, 969-8971)
Rack controller 81-AG
(any version)
65
TECHNICAL INFORMATION
PART NUMBER
969-9309
969-9300
969-9801
969-9802
969-9823
969-9824
969-9290
969-9940
969-9942
969-9375
969-9376
949-9315
949-9309
SH01001 UNIV
969-8988
969-8989
969-8990
969-9538
VENT VALVE
PART NUMBER
969-9843
969-9834
N.O. 969-9844
87-900-983-01(B)