Switching From Ei To Ci Operating Mode - Agilent Technologies 5973N Hardware Installation

Installation

Switching from EI to CI Operating Mode

C A U T I O N
C A U T I O N
42
Special procedure for CI MSD
Refer to the 5973 inert MSD Hardware Manual.
1 Vent the MSD.
2 Open the analyzer.
3 Remove the EI ion source.
Electrostatic discharges to analyzer components are conducted to the
side board where they can damage sensitive components. Wear a
grounded anti-static wrist strap (see the 5973 inert MSD Hardware
Manual) and take other anti-static precautions before you open the
analyzer.
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 two hours.
9 If the vacuum gauge controller is on, turn it off.
10 Set up the software for CI operation. Verify that PCICH4.U is
loaded.
11 Select Purge Cal Valve from the Vacuum menu in the
Diagnostics/Vacuum Control view.
Do not proceed without purging the calibration valve, or the analyzer
will be damaged.
12 Set up the methane reagent gas flow.
13 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.
Hardware Installation