19
Installing a Liquid Reagent
To connect a liquid reagent reservoir to the liquid reagent inlet block, do the
following:
1. Connect a liquid reagent reservoir containing the chosen liquid to the
liquid reagent inlet block.
2. Open the CI needle valve 6-7 turns clockwise.
3. Click
CI Gas Adjustment
to open the CI gas valve solenoids.
4. Allow the vapor flow from the reservoir to equilibrate. If, after several
minutes, there is not enough CI gas entering the trap, open the needle
valve (clockwise).
5. While observing the spectrum, use the Adjust CI Gas, and turn the CI
needle valve to increase or decrease the amount of reagent entering the
trap until the resolution between M and M+1 just starts to degrade.
Details for the three most common reagents can be found under the following
sections in the
4000 GC/MS Software Operation Manu
al: PCI with CH
4
, PCI with
CH
3
CN, and PCI with CH
3
OH.
Properly Adjusted Methanol Reagent Spectrum
Properly Adjusted Acetonitrile Reagent Spectrum
NOTE: For best results with acetonitrile, use a filament emission current of at
least 20
μ
A and maintain at least 50% valley between m/z 41 and m/z 42.
Summary of Contents for 4000 MS
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