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Diffusion Pump
It is not necessary to change the diffusion pump fluid more than once a year, unless
you observe symptoms that suggest a problem with the diffusion pump fluid. The MSD
must be vented in order to check the diffusion pump fluid (except for the 5975/5973).
Therefore, the best time to check the fluid is when the instrument is already vented
for other maintenance.
How to Check the Fluid Level
5972/5971 Series
• If it is not vented already, shut down and vent the MSD according to instrument manual.
• Unplug the MSD power cord.
• Remove the pump and cover the top with aluminum foil.
• After heating the pump in a GC oven at 60°C for 15 minutes to make the fluid flow
down into the reservoir at the bottom, remove the stack parts.
• Inspect the pump fluid. If the fluid is discolored or contains particulate material,
the fluid must be changed.
• Use a metal ruler to determine the depth of the fluid. A pump that has been in
operation should have a pool 9 mm +/- 1 mm deep. Fluid in freshly charged pumps
will be 12 mm deep. It is normal that up to 2 mL of oil may be in the rear portion
of the vacuum manifold. The recommended total fluid charge for the 5971/5972
is 18 mL (+/- 2 mL).
5975/5973 Series
• Use the sight glass to determine the depth of the fluid. The recommended total fluid
charge is approximately 37 mL.
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