Thermo Scientific TRACE GC Ultra Maintenance And Troubleshooting Manual page 392

Chapter 19
Analytical Troubleshooting
SYMPTOMS SOURCE
Baseline
Behavior Characteristics
Drifting
Falling
Drifting
Rising
Rising under
temperature
program
operation
High-standing current
392
Cause
Accumulation of stationary
phase
Carrier gas cylinder
pressure too low to allow
control
Drifting carrier gas or
combustion gas flows
Accumulation of impurities
in column
Carrier gas leak in the
system
Column is baking out
Accumulation of impurities
in column
Contaminated detector
Column contaminated
Carrier gas flow rate too
high
Contaminated column
Contaminated gases
Remedy
Replace the end section of the
column.
Replace the carrier gas cylinder
or increase the pressure.
Check the gas controllers.
Check impurity levels in the gas
source. Use correct gas purity.
Perform a leak test and ensure
the tightness of the connections
on the carrier gas line.
Allow enough time for the
column to stabilize.
Check impurity levels in the gas
source. Use correct gas purity.
Check the detector and clean it.
Recondition the column.
Reduce the carrier gas flow.
Recondition the column.
Replace gas cylinders or gas
filters.
Maintenance and Troubleshooting Manual
Baseline