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Functional Description
Mass Spectrometer
40 TSQ Series Hardware Manual Thermo Scientific
• A feedthrough for lens L0, L11, and L12 voltages
• A feedthrough for the Q00 and Q0 ion optics rf voltages
• A feedthrough for the tube lens offset voltage, ion transfer tube offset voltage, and ion
transfer tube heater voltages
• A vacuum connection for measuring the pressure in the analyzer region with the ion
gauge
• An argon gas inlet into the collision cell
•A vent gas inlet
Two removable side cover plates on the left side of the vacuum manifold allow access to the
Q0 ion optics, mass analyzer, and ion detection system. Two electrically conductive O-rings
provide a vacuum-tight seal between the side cover plates and the vacuum manifold.
Turbomolecular Pump
A Leybold TW220/150/15S triple-inlet turbomolecular pump provides the vacuum for the
Q00 ion optics region, Q0 ion optics region, and analyzer region of the vacuum manifold.
The turbomolecular pump mounts onto the top of the vacuum manifold (Figure 31).
The turbomolecular pump has three pumping inlets:
• A high-vacuum inlet at the top of the rotor stack, which evacuates the analyzer chamber
• An interstage inlet about halfway down the rotor stack, which evacuates the Q0 ion optics
chamber
• A third inlet in the molecular drag section of the pump, which evacuates the Q00 ion
optics chamber
The turbomolecular pump is controlled by a Leybold TDS controller and powered by a
+24 V dc (250 W) power supply. The Main Power circuit breaker switch and the Vacuum
service switch, not the Electronics service switch, turn power for the turbomolecular pump off
and on. The pump is air cooled by a fan that draws air in from the front of the instrument.
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.
Forepumps
One (TSQ Quantum Access and TSQ Quantum Access MAX mass spectrometers) or two
(TSQ Vantage and TSQ Quantum Ultra mass spectrometers) Edwards™ E2M30 forepumps
(or roughing pumps) establish the vacuum necessary for the proper operation of the
turbomolecular pump. The forepump also evacuates the inlet valve and the collision cell. The
pump has a maximum displacement of 650 L/min and maintains a minimum pressure of
approximately 1 Pa (0.01 Torr).
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