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To disconnect the coaxial high voltage cable from the controller, slide
the safety locking sleeve (very little sleeve travel is required) from the
control unit and at the same time pull on the male end of the cable
connector to remove it from the socket on the control unit.
Bakeout
When a 2 l/s ion pump does not reach the desired base pressure, and
there are no leaks, it is necessary to bake the system. This can be
done by heating the pump and all the components in the system, and
is generally required to achieve less than 10
Unusual Operating Conditions
If the pump current reads lower than normal for the pressure, the
discharge may have been extinguished.
To check for the pump being "out of strike" (discharge extinguished),
remove the magnet and observe the residual current. If the current is
the same with and without the magnet in place, no discharge exists in
the pump.
2
l/s Ion Pump
/ 87-900-091-01
The pump body can be baked up to 400 °C if the magnet and the
H.V. cable connector have been removed.
If the bakeout is done with magnets and H.V. cable connected, the
maximum allowable temperature is 150 °C and the pump control
unit can be left on in order to be able to monitor the pressure
variations. During the bakeout cycle the pressure must not
increase above 5x10
bakeout off and then on again when low pressure is restored.
Bake the 2 l/s pump for 24 hours. Longer bakeout periods are
recommended when the pump has been used with heavy gas load
applications.
Wait until the pump cools down to room temperature and
recovers its initial pressure before using it in the application.
(E)
-5
mbar, if this value is reached, turn the
Technical Information
Bakeout
-8
mbar base pressures.
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