8CI Maintenance
To Switch from an EI XTR, SS, or Inert Source to the CI Source
5977B Series MSD Operating Manual 233
To Switch from an EI XTR, SS, or Inert Source
to the CI Source
Procedure
1 Vent the MSD. (See“To Vent the MSD” on page 136.)
2 Open the analyzer. (See“To Open the Analyzer Chamber” on page 176.)
3 Remove the EI source. (See“To Remove the EI XTR, SS, or Inert Source” on
page 196.)
4 If removing an XTR source, remove the brown extractor wire from the
ceramic source board and store it with the EI XTR source. (See Figure 55 on
page 179.)
5 Install the CI source. (See“To Install the CI Source” on page 250.)
6 Install the CI/Extractor interface tip seal if it is not already installed
(p/n G3870-20542). (See“To Install the GC/MSD Interface Tip Seal” on
page 50.)
7 Close the analyzer. (See“To Close the Analyzer Chamber” on page 220.)
8 Pumpdown the MSD. (See“To Pumpdown the MSD in CI Mode” on
page 148.)
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.
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 171.) Take
antistatic precautions before you open the analyzer chamber.
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