Thermo Scientific TRACE GC Ultra Maintenance And Troubleshooting Manual page 397

Peaks
Behavior Characteristics
Negative
Some
peaks
No peaks after solvent peak
No peaks at all
Tailing Sample peaks
Maintenance and Troubleshooting Manual
Cause
Symptom can be normal
Carrier gas flow too high
Combustion gas flow
incorrect
Detector contaminated
FID flame extinguished by
solvent peak
Too much sample injected
Incorrect column position
in S/SL injector (too high)
Clogged syringe needle
Column broken or
disconnected
Defective electrometer or
amplifier
Defective recording device
FID flame is out
Poor or missing electrical
connection
Incorrect column position
in S/SL injector (too high)
Column degradation
causing activity
Column/oven temperature
too low
Dirty liner
Analytical Troubleshooting
Remedy
Reduce the carrier gas flow rate.
Check the combustion gas flow.
Bake out or clean the detector.
Check the detector temperature.
Inject less sample.
Check the column position.
Replace or repair the syringe.
Check the column and
connections.
Replace the electrometer or
amplifier.
Replace the recording device.
Light the flame.
Check the cable connections.
Check the column position.
Inject a test mixture and evaluate
the column.
Increase the column/oven
temperature. Do not exceed the
recommended maximum
temperature for the stationary
phase.
Clean or replace the liner.
Chapter 19
397