Vacuum System 6
5977B Series MSD Troubleshooting and Maintenance Manual 169
Diffusion Pump and Fan
The diffusion pump in the MSD is an air-cooled vapor diffusion pump with
90 L/s capacity. It mounts with a KF50 fitting to a baffle adapter clamped to
the bottom of the analyzer chamber.
The diffusion pump has a cylindrical body surrounded by fins to help
dissipate heat. Its inlet is open to the interior of the analyzer chamber, through
the adapter and baffle. A structure called the stack is located at the center of
the pump body. An electric heater is located at the bottom of the stack.
See Figure 33 on page 169 and Figure 34 on page 170.
Figure 33 Diffusion pump with fan
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