Agilent Technologies 5975T LTM GC/MSD, Troubleshooting And Maintenance Manual

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88 Troubleshooting and Maintenance Guide
6
Shutdown Symptoms
Column Shutdowns
The instrument monitors inlet and auxiliary gas streams. If a
carrier gas (which can include an auxiliary flow module or
pneumatics control module) is unable to reach its flow or
pressure setpoint, the instrument assumes that a leak exists. It
will warn you with a beep after 25 seconds, and it will continue
to beep in intervals. After about 5 minutes, the instrument will
shut down components to create a safe state. The instrument:
• Displays
Front inlet pressure shutdown
.
• Turns off to avoid column damage.
• Flashes LTM column temperature setpoint
Off
.
•
Turns off all flows for the column. When viewed, their
parameters flash
Off . For example, the septum purge and
column flows would turn off.
• Turns off all other heaters. When viewed, their temperature
parameters flash
Off .
• Attempts to turn on a shut-down zone fail with an error
message.
To recover from this state.
1
Fix the cause of the shutdown.
• Check for a broken column near the inlet.
• Check for leaks.
• Replace the inlet septum.
• Replace the inlet O-ring.
• Check the supply pressure.
2
Press the key for the device that initiated the shutdown.
Scroll to the pneumatic parameter that is flashing
Off
, then
press [On] or [Off] .
For example, if the inlet ran out of carrier gas, click
[Inlet]
from the electronic keypad, scroll to the pressure or flow
parameter, then click
[On]
.