116 5977 Series MSD Operation Manual
4 Operating in Chemical Ionization (CI) Mode
To Verify NCI Performance
This procedure is for EI/PCI/NCI MSDs only.
Materials needed
• Octafluoronaphthalene (OFN), 100 fg/µL (5188-5347)
Procedure
1 Verify that the MSD performs correctly in EI mode.
2 Load the NCICH4.U tune file, and accept the temperature setpoints.
3 Select Gas A and set flow to 40%.
4 In Tune and Vacuum Control view, run CI Autotune. See “To Perform an
NCI Autotune (Methane Reagent Gas)” on page 113.
Note that there are no criteria for a “passing” Autotune in CI. If the
Autotune completes, it passes.
5 Run the NCI sensitivity method: OFN_NCI.M using 2 µL of 100 fg/µL OFN.
6 Verify that the system conforms to the published sensitivity specification.
Please see the Agilent Web site at www.agilent.com/chem for
specifications.
CAUTION
Always verify MSD performance in EI before switching to CI operation. See “To Verify
System Performance” on page 71. Always set up the CI MSD in PCI first, even if you are
going to run NCI.
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