Specifications

Vacuum System 6
5975 Series MSD Troubleshooting and Maintenance Manual 185
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 39.