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4
General Maintenance
Never exceed the maximum column temperature.
C A U T I O N
16 Hold the temperature of 10 °C above your highest analytical temperature
Be careful! The guard column heated enclosure or internal accessories may be hot
WA R N I N G
enough to cause burns. If either is hot, wear heat-resistant gloves to protect your
hands or allow the parts to cool before beginning the work.
17 Load your maintenance method for cooling down the column enclosure. See
18 Attach the installed inlet guard column to the LTM column module inlet
19 Install a new MSD guard column between the MSD transfer line and LTM
20 Pump down the instrument. See
21 Turn on the inlet, set the mode to splitless, and the column flow to 30 cm/s.
22 Check for leaks.
23 If your method requires hydrogen carrier gas, disconnect the current
24 With a column flow of 30 cm/s, wait for 5 to 10 minutes before increasing
25 Restore the analytical method.
130
for 1 hour while allowing a flow rate of 30 cm/s through the column.
"Column maintenance method"
union.
column outlet union. See
Interface"
on page 38 and
Unions"
on page 52.
carrier gas supply from the instrument and attach the hydrogen supply.
Verify that the analyzer is under vacuum and the vacuum pumps are
working before opening the hydrogen supply line. From the ChemStation,
change the configured carrier gas to hydrogen.
the LTM column temperature to a low standby temperature.
on page 120.
"To Install an MSD Guard Column in the GC/MSD
"To Attach the Guard Columns to the LTM CFT
"Pumping Down"
5975T LTM GC/MSD Operation Manual
on page 73.
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