18 5977B Series MSD Troubleshooting and Maintenance Manual
1 Introduction
Changing modes
Switching back and forth between CI and EI ion sources takes less than an
hour, although a 1- to 2-hour wait is required to purge the reagent gas lines
and bake out water and other contaminants. Switching from PCI to NCI
requires about 2 hours for the ion source to cool.
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