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4
General Maintenance
Maintenance Methods
Before performing maintenance procedures on the inlet, LTM column module,
guard column enclosure, and GC/MS transfer line, the instrument must be
made safe. Agilent recommends that you create and store the following
maintenance methods. The methods below will:
• Prevent damage to the instrument (electronics, columns, etc.)
• Avoid injury to the user (burns, shocks, etc.)
• Allow you to perform maintenance on specific areas while leaving the rest
From operating temperature the inlet may require 12 hours or longer to cool down to the
N O T E
maintenance method setpoint.
Column maintenance method
Create a method for cooling down the instrument prior to performing
maintenance tasks on the capillary column system between the inlet and MSD.
• Set the LTM column temperature to 35 °C. This allows the LTM column
• Set the heater to Off for the guard column enclosure.
• Set the MSD transfer line heater Off.
• Set the inlet temperature to 35 °C and set the inlet gas flow to 30 cm/s.
• Turn off the analyzer filament and EM.
Once the method setpoints are reached, the instrument becomes Ready. Next, a
procedure normally instructs you to turn heaters off and shut down gas flows
allowing maintenance to be performed.
Be careful! The LTM column, guard column enclosure, GC/MSD transfer line,
WA R N I N G
analyzer and inlet may be hot enough to cause burns. If hot, wear heat-resistant
gloves to protect your hands.
120
of the components at operating temperature
module fan to quickly cool the column.
•
Wait for the LTM column to cool down before turning off column carrier
gas flow at the source. Cap both ends of the column to keep air out if you
are removing it.
•
When possible, keep inert carrier gas flowing to protect the column.
5975T LTM GC/MSD Operation Manual
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