Installation manual

102 5975 Series MSD Operation Manual
4 Operating in Chemical Ionization (CI) Mode
To switch from the EI source to the CI source
Procedure
1 Vent the MSD. See page 82.
2 Open the analyzer.
3 Remove the EI ion source. See page 134.
4 Install the CI ion source. See page 142.
5 Install the interface tip seal. See page 143.
6 Close the analyzer.
7 Pump down the MSD. See page 103.
CAUTION
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.
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 “Electrostatic discharge” . Take antistatic precautions before you open the
analyzer chamber.