CI Maintenance 7
5977B Series MSD Operating Manual 199
To Switch from the EI HES to the CI Source
Procedure
1 Vent the MS. (See “To Vent the MSD” on page 113.) The software will
prompt you for the appropriate actions.
2 Open the left side access panel. (See “To Open the Analyzer Chamber” on
page 152.)
3 Open the analyzer chamber. (See “To Open the Analyzer Chamber” on
page 152.)
4 Remove the EI HES. (See “To Remove the EI HES” on page 154.)
5 Place the EI HES in the storage container.
6 Remove the EI HES radiator. (See “To Remove the EI HES Radiator” on
page 200.)
7 Place the EI HES radiator in the storage container.
8 Remove the CI source radiator from the storage container.
9 Install the CI source radiator. (See “To Install the CI Source Radiator” on
page 202.)
10 Remove the CI source from the storage container.
11 Install the CI source. This requires shortening the column so that it
protrudes from the transfer line by 1 to 2 mm. (See “To Install the CI
Source” on page 225.)
12 Pumpdown the MSD. (See “To Pumpdown the MSD in CI Mode” on
page 124.)
Always verify GC/MS performance in EI before switching to CI operation.
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 is a threat to MSD electronics” on page 21.) Take
antistatic precautions before you open the analyzer chamber.
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