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3 Remove the MSD guard column from the GC/MSD transfer line and cap the
4 If necessary, install a new liner and septum in the inlet before powering on
5 Remove the inlet guard column and discard or trim for subsequent reuse.
6 Trim the MSD transfer line end of the MSD guard column at the ferrule.
7 From the ChemStation, change the carrier gas type configured if switching
8 If the column was previously used in analyses of toxic chemicals, attach the
9 Turn on the inlet, set the mode to split, and the column flow to 30 cm/s.
10 Check for leaks.
Do not heat the column without a flow of carrier gas. You will damage the column.
C A U T I O N
11 Allow the carrier gas to flow through the column for 5 minutes without
12 Close the LTM module door.
13 Set the guard column enclosure temperature to 10°C below the maximum
14 Ramp the LTM column temperature 5 °C/minute to 10 °C above your
15 Once the LTM column temperature exceeds 80 °C, inject 5 µL methanol into
5975T LTM GC/MSD Operation Manual
GC/MSD transfer line.
the instrument.
Attach this end of the guard column to the inlet. See
Guard Column in the Split/Splitless Inlet"
moves the original MSD guard column to the inlet and reverses the carrier
flow through the LTM column module.
to a different carrier gas supply.
open end of the LTM column to an exhaust system and vent to a safe
location. This also applies to the split vent and purge vent outlets on the
inlet.
heating the LTM column or guard column enclosure.
LTM column temperature.
highest analytical temperature.
the inlet. Repeat two more times at 5-minute intervals. This helps remove
any contamination from the column before it is installed into the GC/MSD
interface.
General Maintenance
"To Install an Inlet
on page 33. This configuration
4
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