Installation manual

110 5975 Series MSD Operation Manual
4 Operating in Chemical Ionization (CI) Mode
Methane pretune after more than a day of baking out
Note the low abundance of m/z 19 and absence of any visible peak at m/z 32.
Your MSD will probably show more water at first, but the abundance of m/z 19
should still be less than 50% of m/z 17.
CAUTION
Continuing with CI autotune if the MSD has an air leak or large amounts of water will
result in severe ion source contamination. If this happens, you will need to vent the
MSD and clean the ion source.
Figure 29 Reagent ion scans