Thermo Scientific TSQ Series Hardware Manual page 55

The vacuum manifold has the following feedthroughs and inlets:
• A feedthrough for the high voltage for the conversion dynode
• A feedthrough for the high voltage for the electron multiplier
• A feedthrough for the ion current signal from the anode of the electron multiplier
• Two feedthroughs for the Q1 quadrupole rf voltage
• Two feedthroughs for the Q3 quadrupole rf voltage
• A feedthrough for the Q2 quadrupole rf voltage
• A feedthrough for lens L21, L22, L23, L31, L32, and L33 voltages
• 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
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.
Thermo Scientific
2
Functional Description
Mass Spectrometer
(Figure 31).
TSQ Series Hardware Manual 37