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Pump Description
The TwisTorr 404 FS pump consists of a high frequency motor
driving a turbine fitted with 5 bladed stages and 2.5 TwisTorr drag
stages. The turbine rotates in an anticlockwise direction when viewed
from the high vacuum flange end.
The turbine is made of high-strength Aluminum alloy, machined from
a single block.
The turbine rotor is supported by permanently lubricated high
precision ceramic ball bearings installed on the forevacuum side of
the pump.
The static blades of the stator are made of Aluminum alloy and
stainless steel. These are supported and accurately positioned by
spacer rings.
The TwisTorr stators are in the form of selfpositioning machined
disks. On each disk there are parallel spiral pumping channels
designed to pump in centrifugal direction on one side and in
centripetal direction on the other side. These are made of aluminium
alloy.
During normal operation, the motor is fed with a voltage of 54 Vac
three-phase at 825 Hz. To reduce losses during start-up to a
minimum, the frequency increases according to a ramp with a higher
initial voltage/frequency ratio.
The pump must always be cooled before starting using it. Running the pump
WARNING!
without cooling it could damage inside components.
The pump can be water cooled or air cooled: in the first case the
customer can use the dedicated channels on the pump body, in the
second case an external optional fan is available. A thermistor sensor
is mounted near the upper bearing to prevent the pump from
overheating.
TwisTorr 404 FS User Manual / 87-901-048-01
Technical Information
Description of the TwisTorr 404 FS
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