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2
Installing LTM Columns
Column bleed is most common in new or poorly crosslinked columns. It is
much worse if there are traces of oxygen in the carrier gas when the column is
heated. To minimize column bleed, all capillary columns should be
conditioned before they are installed in the GC/MSD interface.
Conditioning ferrules
Heating ferrules to their maximum expected operating temperature a few
times before they are installed can reduce chemical bleed from the ferrules.
Tips and hints
• The column installation procedures for the 5975T LTM GC/MSDs is
• You can remove old ferrules from column nuts with an ordinary push pin.
• Always use carrier gas that is at least 99.9995% pure.
• Because of thermal expansion, new ferrules may loosen after heating and
• Always wear clean gloves when handling columns, especially the end that
If you are using hydrogen as a carrier gas, do not start carrier gas flow until the
WA R N I N G
column is installed in the MSD and the MSD has been pumped down. If the vacuum
pumps are off, hydrogen will accumulate in the MSD and an explosion may occur.
See
Always wear safety glasses when handling capillary columns. Use care to avoid
WA R N I N G
puncturing your skin with the end of the column.
32
different from that for previous MSDs. Using the procedure from another
instrument may not work and may damage the column or the MSD.
cooling a few times. Check for tightness after two or three heating cycles.
will be inserted into the GC/MSD interface.
"Hydrogen Safety"
.
5975T LTM GC/MSD Operation Manual
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