HP 5973 - To Pump down the MSD

58
2 Operating the MSD
To pump down the MSD
To pump down the MSD
Software changes The software is revised periodically. If the steps in this procedure do not match
your MSD ChemStation software, refer to the manuals and online help supplied
with the software for more information.
1 Select
Diagnostics/Vacuum Control from the View menu.
2 Select
Pump Down from the Vacuum menu.
3 When prompted, switch on the MSD.
Press on the sideplate while turning on the MSD to ensure a good seal. The rough
pump will make a gurgling noise. This noise should stop within a minute. If the
noise continues, there is a large air leak in your system, probably at the interface
column nut, the vent valve, or the sideplate.
4 Click
OK.
Within 10 to 15 minutes the diffusion pump should be hot, or the turbo pump
speed up to 80%. If the MSD does not pump down correctly, see the online help for
information on troubleshooting air leaks and other vacuum problems.
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Continuing the pumpdown with a large air leak can damage the MSD. Newer MSDs will
shut down the foreline pump if a large leak is present.