TECHNICAL INFORMATION
29
87-900-878-01(C)
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.
NOTE
The turbopump must be "baked" only when operat-
ing with an inlet pressure less than 10
-4
mbar and
with water cooling.
!
!
!
!
CAUTION
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.