Heater Band Installation - Varian 969-9057 Instruction Manual

HEATER BAND INSTALLATION

The heater band model 969-9808 and 969-9807
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 casing, as shown in the figure, and heats it
to a temperature of about 80q C.
The heater band must be mounted such that there
is perfect thermal contact with the pump wall to ob-
tain fast and efficient heating.
Switch on the heater while the turbopump is in op-
eration. In the event of turbopump overheat, the
heater will be automatically cut out by the thermis-
tor sensor.
The turbopump must be "baked" only when operat-
ing with an inlet pressure less than 10
with water cooling.
! ! ! !
If the chamber of the system is "baked" at a high
temperature, a shield should be installed to prevent
thermal radiation heating the high vacuum flange
on the pump. The maximum temperature allowed
for the inlet flange is 120q C.
29
TECHNICAL INFORMATION
NOTE
-4
mbar and
CAUTION
87-900-878-01(C)