Agilent Technologies QuickSwap G3185B, Установка и настройка

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Overview
QuickSwap Installation and Startup 35
Final leak test procedure for CI sources
This procedure applies for all MSDs with a CI source installed. This procedure:
• Is similar to the procedure used for an EI source (see “Final leak test
procedure for EI sources” on page 32)
•
Requires MSD ChemStation version D.02.00 or later
• Requires one initial run in positive chemical ionization (PCI) mode
For CI users running MSD ChemStation version D.01.xx or earlier, Agilent
recommends installing the EI source for easier QuickSwap installation and
leak test. (See
“Final leak test procedure for EI sources” on page 32.)
1 Verify the following:
• QuickSwap and the column are installed
• QuickSwap purge gas is set to 4 psig
• The MSD has pumped down for at least 30 minutes
• The CI reagent gas is connected and flowing to the system
2 From the MSD ChemStation Instrument Control screen, select View > Tune and
Vacuum Control .
3 Verify a PCI method is loaded, or select File > Load Tune Values... and select
the PCI tune file (pcich4.u).
4 If the current tune file is not recent, perform a CI autotune ( Tune > CI
Autotune ). See the MSD hardware manual.
N O T E
The recommended procedure provides the best leak test considering time and the different
ionization properties associated with positive and negative chemical ionization.
In PCI mode, neither air nor Freon134a peaks appear. MSD ChemStation D.02.00 or greater
allows use of the CI source in EI mode to detect these peaks without changing the source,
which saves time. If using an earlier MSD ChemStation, instead of changing the source,
you might try an alternate leak test gas if you know its corresponding CI mass fragments.
In negative chemical ionization (NCI) mode, air peaks will not appear, but Freon134a peaks
will, although the
m/z values may differ. They will be visible in Scan mode in the manual
tune screen in a manner analogous to that used for EI leak checking.