110 5977 Series MSD Operation Manual
4 Operating in Chemical Ionization (CI) Mode
To Switch from the CI Ion Source to the Extractor EI Ion Source
Procedure
1 From the Tune and Vacuum Control view, vent the MSD. See “To Vent the MSD”
on page 76. The software will prompt you for the appropriate actions.
2 Open the analyzer. See “To Open the Analyzer Chamber” on page 78.
3 Remove the CI ion source. See “To Remove the CI Ion Source” on page 157.
There is no need to remove the tip seal, as in the standard or inert EI ion
source. The CI interface tip seal will fit in the extractor EI ion source.
4 Install the EI extractor ion source. See “To Install the EI Ion Source” on
page 150.
5 Locate the brown extractor wire from storage and connect it to the
extractor lens and the source board.
6 Place the CI ion source in the ion source storage box.
7 Pump down the MSD. See “To Pump Down the MSD in EI Mode” on
page 84.
8 Load your EI tune file.
CAUTION
Always wear clean gloves while touching the analyzer or any other parts that go inside
the analyzer chamber.
CAUTION
Electrostatic discharges to analyzer components are conducted to the side board
where they can damage sensitive components. Wear a grounded antistatic wrist strap
and take other antistatic precautions before you open the analyzer chamber.
See “Electrostatic discharge” on page 123.
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