96 5977 Series MSD Operation Manual
4 Operating in Chemical Ionization (CI) Mode
To Switch from the Standard or Inert EI ion source to the CI Ion Source
Procedure
1 Vent the MSD. See “To Vent the MSD” on page 76.
2 Open the analyzer. See “To Open the Analyzer Chamber” on page 78.
3 Remove the EI ion source. See “To Remove the EI Ion Source” on page 128.
4 Install the CI ion source. See “To Install the CI Ion Source” on page 167.
5 Install the CI/Extractor interface tip seal (p/n G3870-20542). See “To
Install the CI/Extractor Interface Tip Seal” on page 155.
6 Close the analyzer. See “To Close the Analyzer Chamber” on page 80.
7 Pump down the MSD. See “To Pump Down the MSD in CI Mode” on
page 98.
CAUTION
Always verify MSD performance in EI before switching to CI operation.
Always set up the CI MSD in PCI first, even if you are going to run NCI.
CAUTION
Electrostatic discharges to analyzer components are conducted to the side board
where they can damage sensitive components. Wear a grounded antistatic wrist strap.
See“Electrostatic discharge” on page 123. Take antistatic precautions before you open
the analyzer chamber.
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