symmacros(jimzhu)发表:Changing Columns Without Venting the MSD
For systems that use an MSD attached to the splitter, one added advantage is the gc column can be changed without venting the MSD. When the column is disconnected from the splitter plate, the makeup gas forces air out of the fitting, preventing air from reaching the MSD.
To change columns with the splitter, the recommended steps are:
1 Cool the inlet to which the column to be removed is connected.
2 Disconnect the column from the splitter plate.
3 Immediately install a plug in the plate where the column was connected.
4 Change the column in the inlet and turn on carrier gas to displace air from the column.
5 Preswage a metal ferrule on the outlet end of the column.