Functional Description
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___________________________________________________________________ MS Detector
_______________________ Finnigan LTQ Hardware Manual _____________________
2-29
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The turbomolecular pump is controlled by a Leybold TDS controller and
powered by a +24 V dc (250 W) power supply. Power for the turbomolecular
pump is turned off by the the main power circuit breaker switch, but not by
the electronics service switch. The pump is air cooled by a fan that draws air
in from the front of the instrument.
The Leybold TDS Turbomolecular Pump Controller provides power to and
control of the turbomolecular pump. The turbomolecular pump status
(temperature, rotational speed, etc.) is sent from the Turbomolecular Pump
Controller to the embedded computer over a serial line. Power to the
turbomolecular pump is shut off if the foreline pressure, as measured by the
Convectron gauge, is too high, or if the turbomolecular temperature is too
high.
Forepump
An Edwards E2M30 forepump (or mechanical pump) establishes the vacuum
necessary for the proper operation of the turbomolecular pump. The forepump
also evacuates the ion transfer capillary-skimmer region of the vacuum
manifold. The pump has a maximum displacement of 650 L/min and
maintains a minimum pressure of approximately 100 Pa (1Torr).
Figure 2-17. Turbomolecular pump
High-Vacuum
Inlet
Interstage
Inlet
Molecular
Drag Inlet
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