6
Analytical Troubleshooting
Headspace Technique Points Regarding Chromatographic Effects
230
TriPlus RSH User Guide
Thermo Scientific
Headspace Technique Points Regarding Chromatographic Effects
This sections provides general troubleshooting guidelines regarding the Headspace technique:
Unexplained collisions of Head.
Object not defined correctly.
Define Object correctly.
See
Chapter 5 TriPlus RSH Defining Object
Positions
in the TriPlus RSH Hardware
Manual.
Verify the position for all objects, including
passive and active modules.
Object missed by Syringe Needle.
When several tools are used from a
ATC Station, have the tools calibrated
to compensate for any deviations.
Check the tool calibration as described in
Chapter 5 TriPlus RSH Defining Object
Positions
in the
TriPlus RSH Hardware
Manual
.
Unexpected collision on Tray Holder.
Wrong Vial Type settings in Tray Type. Check the settings in
Tray Type
(Rack Type).
Table 96.
General Points Regarding GC Effects - Troubleshooting Guideline (Sheet 3 of 3)
Symptom or Error Message
Possible Cause
Recommended Action
Table 97.
Headspace Technique Points Regarding GC Effects - Troubleshooting Guideline (Sheet 1 of 2)
Symptom or Error Message
Possible Cause
Recommended Action
Sample peaks or responses are not
reproducible.
Dirty syringe.
Increase method value
Syr Purge
.
Syringe pressure differences.
Increase
Def Aspirate Delay (
Pull-up Delay)
value.
Vacuum created in sample vials.
Reduce sample volume.
Improperly crimped vials.
Check vial cap by attempting to rotate
manually. Loose caps might cause selective loss
of more volatile components from sample.
Adjust crimping tool correctly.
None or too low syringe purge gas
pressure.
Check pressure at purge gas regulator (0.5 bar;
7.25 psig; 50 kPa) during the syringe purging
period. Check gas flow at syringe needle tip.
Method parameters.
Check recommended Method Parameters.
The following parameters are crucial and must
be verified first:
•
Def Aspirate Flow Rate
(Fill Speed)
•
Def Aspirate Delay
(Pull-up Delay)
•
Def Dispense Flow Rate
(Injection
speed)
•
Def Dispense Delay
(Post Inj Delay)
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