Heater Band Installation - Varian 969-9361 Serie Manual De Instrucciones

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 ob-
tain 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 oper-
ating with an inlet pressure less than 10
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.
56
TECHNICAL INFORMATION
NOTE
-4
CAUTION
87-900-861-01(G)
mbar