Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual page 126

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General Maintenance
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Preheat the new diffusion pump fluid following the instructions on the
bottle.
Pour new diffusion pump fluid into diffusion pump until the fluid level is
within the FULL COLD range.
The recommended charge for this pump is 30 mL. It will require
approximately 1.5 of the bottles (18.5 mL each) of diffusion pump fluid.
Pour the fluid between the center stack and the side wall. Watch the sight
glass while pouring. Do not overfill.
Reinstall the diffusion pump. See page 127.
5975 Series MSD Troubleshooting and Maintenance Manual