HP 5973 - To Replace the Diffusion Pump Fluid

116
4 Maintaining the MSD
To replace the diffusion pump fluid
To replace the diffusion pump fluid
Materials needed: Aluminum foil, clean
Cloths, clean, lint-free (05980-60051)
Container for old diffusion pump fluid
Diffusion pump fluid, 18.5 ml (6040-0809) – 2 required
Gloves
oil- and solvent-resistant
thermally insulated
1 Remove the diffusion pump from the MSD (page 114).
Make sure you remove the O-ring assembly from the top of the diffusion pump.
2 Cover the top of the diffusion pump with aluminum foil.
3 Heat the diffusion pump at 60°C for 15 minutes in your GC oven.
4 Pour the old diffusion pump fluid out the top of the pump.
Even after heating, the pump fluid pours very slowly.
Charred or blackened
pump fluid
If the diffusion pump has been heated with insufficient pump fluid (or with a large
air leak in the MSD), the remaining pump fluid may be severely blackened. Black-
ened pump fluid may also be baked onto the internal parts (stack) of the pump. If
so, you may have to remove the diffusion pump stack and clean its parts, and the
interior of the pump, with methylene chloride. Be very careful when reinstalling
the stack. Misalignment of stack components can seriously reduce diffusion pump
performance.
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