Pump Used In Presence Of Magnetic Fields; Accessories And Spare Parts - Agilent Technologies TV 801 Navigator 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 consumption 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 radiation 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 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 greater, than the case should be carefully
reviewed by Agilent's specialist. As a matter of fact, in case of high
magnetic fields, also important forces might be generated and applied
to the rotor.

Accessories and Spare Parts

Tab. 8
DESCRIPTION
Mains cable NEMA Plug, 3m long
Mains cable European Plug, 3m long
TV 801 Navigator User Manual / 87-900-953-01
Pump Used in Presence of Magnetic Fields
Accessories and Spare Parts
(G)
Technical Information
PART NUMBER
969-9958
969-9957
245/252
17