To Check The Diffusion Pump Fluid - Agilent Technologies 5975C TAD VL MSD Troubleshooting And Maintenance Manual

To Check the Diffusion Pump Fluid

Materials needed
• Screwdriver, Torx T-15 (8710-1622)
Procedure
1
Do not remove any other covers. Removing other covers may expose hazardous
WARNING
voltages.
2
3
Keep your hair away from the cooling fan if the MSD is turned on.
WARNING
4
5975 Series MSD Troubleshooting and Maintenance Manual
Remove the analyzer window cover.
Vent the MSD.
Remove the side cover.
Check the diffusion pump fluid level. See
The diffusion pump fluid level can be seen through the window below the
fan at the front of the MSD. The diffusion pump fluid level should be
between the top and bottom of one of the FULL ranges. There are two sets of
marks. Use the HOT marks if the diffusion pump is on and is at its normal
operating temperature. Use the COLD marks if the pump is off and has had
time to cool. If the fluid level is below the bottom of the appropriate range,
replace the diffusion pump fluid. Do not just add fluid.
The pump fluid should be clear or almost clear. Dark or cloudy pump fluid
indicates an air leak or excessive heat. If the pump fluid appears dark or
cloudy, replace it. Then, check for an air leak.
The diffusion pump fluid should be replaced at least once a year, or more
often if the pump fluid level is low or if the fluid is dark or cloudy.
General Maintenance
Figure 8.
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