Heater Band Installation - Varian Turbo-V70LP Instruction Manual

HEATER BAND INSTALLATION

The heater band model 969-9801 and 969-9802
can be used to heat the pump casing when a
bakeout is needed.
The heater band is applied to the upper part of the
pump envelope, as shown in the figure, and heats
it to a temperature of about 80° C.
The heater band must be mounted such that there
is perfect thermal contact with the pump wall to
obtain fast and efficient heating.
Switch on the heater while the turbopump is in op-
eration. If, for any reason, the turbopump body
overheats, it will be automatically cut out by the
thermistor sensor.
The turbopump must be "baked" only when
operating with an inlet pressure less than 10
mbar and with water cooling.
!
If the chamber of the system is "baked" at a high
temperature, a shield should be installed to pre-
vent thermal radiation heating the high vacuum
flange on the pump. The maximum temperature
allowed for the inlet flange is 120° C.
29
TECHNICAL INFORMATION
NOTE
CAUTION
87-900-862-01(E)
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