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Functional Description
Zone 3
is the diffusion pump compartment. The lower fan on the rear panel pulls
air in through carefully positioned vents in the left side panel. Airflow is ducted
around the diffusion pump’s cooling fins, and expelled through the rear of the
instrument.
CAUTION
The left side cover must remain in place whenever the instrument is on. Failure
to do so will cause the airflow to bypass the pump, which will overheat and
trigger a system shutdown. Fan failure will have the same result. GC side
cover must also be in place.
Turbomolecular Pump Vacuum System
The turbomolecular vacuum system evacuates excess water vapor, air, and
carrier gas from the mass spectrometer ion trap assembly. Principal
turbomolecular vacuum system components include
•
Vacuum manifold
•
Turbomolecular pump
•
Foreline pump
•
Vent valve
•
Calibration gas valve
•
CI reagent gas valves
Below is a diagram of the vacuum system.
The Saturn Turbomolecular Vacuum System
Turbomolecular Pump Vacuum Manifold
The vacuum manifold, which can be heated for bake out, encloses the ion trap
assembly. The vacuum manifold is a stainless-steel tube, which houses the
analyzer. The turbomolecular vacuum pump, which evacuates the manifold,
discharges into a foreline pump. (Also see Diffusion Pump Vacuum System
section for additional vacuum manifold information for the diffusion pump
system.)
