40 Hardware Installation
2 Installation
Switching from EI to CI Operating Mode
Special procedure for CI MSD
Refer to the 5975 Series MSD Hardware Manual.
1 Vent the MSD.
2 Open the analyzer.
3 Remove the EI ion source.
4 Install the CI ion source.
5 Install the interface tip seal.
6 Pump down the MSD.
7 Set methane flow to 40%.
8 Bake out and purge the MSD for at least 2 hours.
9 If the vacuum gauge controller is on, turn it off.
10 Set up the software for CI operation. Load PCICH4.U.
11 Select Purge Cal Valve from the Vacuum menu in the Tune and Vacuum Control
view.
12 Set up the methane reagent gas flow.
13 Select the Tune/CI from the Tune menu to edit PCICH4.U as needed.
14 Perform the autotune. Select Tune/CI Tune.
15 Verify that there is no visible peak at m/z 32, and that the peak at m/z 19 is
less than 50% of that at m/z 17.
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 the 5975 Series MSD Hardware Manual) and take other antistatic precautions
before you open the analyzer.
CAUTION
Do not proceed without purging the calibration valve, or the analyzer will be damaged.
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