6 General Maintenance
To Replace a Filament in an EI XTR, SS, Inert, or Hydronert Source
198 5977C GC/MSD Operating Manual
6 Secure the new filament with the gold plated screw and washer. (See
Figure 64.)
7 After installing the filament, verify that it is not grounded to the source body.
8 Install the EI source. (See “To Install the EI XTR, SS, Inert, or Hydronert
Source” on page 199.)
9 Close the analyzer chamber. (See “To Close the Analyzer Chamber” on
page 202.)
10 Pumpdown the MSD. (See “To Pumpdown the MSD” on page 112.)
11 Autotune the MSD. (See “To Tune the MSD in EI Mode” on page 100.)
12 In the Manual Tune dialog, the Filament parameter allows you to enter 1 or 2
for the filament number. Whichever number was present during the previous
autotune enter the other filament number.
13 Autotune the MSD again.
14 Enter the filament number that gave the best results.
If you decide to use the first filament number, run Autotune again to make
sure the tune parameters are compatible with the filament.
15 Select Save Tune Parameters from the File menu.
Figure 64. Changing the filament
Gold plated screws
and washers
Gold plated screws
and washers
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