6
Analytical Troubleshooting
General Points Regarding Chromatographic Effects
228
TriPlus RSH User Guide
Thermo Scientific
General Points Regarding Chromatographic Effects
This sections provides general troubleshooting guidelines regarding the chromatographic
effects:
Table 96.
General Points Regarding GC Effects - Troubleshooting Guideline (Sheet 1 of 3)
Symptom or Error Message
Possible Cause
Recommended Action
Very low or no detector signal is
observed.
Clogged syringe.
Remove syringe and aspirate/dispense liquid
manually.
Clean syringe.
Bent syringe needle or bent plunger.
Inspect the syringe. Replace it if necessary
Note:
Bottom Sensing using a long needle
(85 mm) has a high risk of needle bending.
How to remove a syringe with a bent needle
or plunger is explained in the section
Manually Removing a TriPlus RSH Tool
from the RSH Head
of the
TriPlus RSH
Hardware Manual
.
No sample liquid is injected.
Check, adjust, the needle penetration into
sample vial.
Sample volume too low.
Increase sample volume.
Wrong setting of syringe needle
penetration in GC injector.
Check
Needle Penetration Depth
settings
and compare with GC manufacturer
recommended parameters.
Syringe does not fill properly.
Air bubbles below syringe plunger. It is
possible that air bubbles remain below
the plunger after the first pull-up. If
the plunger is moved up and down
several times, these air bubbles are
worked out.
Increase method parameter
Def Fill Strokes
Count
(Fill Strokes).
Check the method parameters
Def Aspirate
(Fill Speed) and
Def Aspirate Delay
(Pull-up
Delay).
Wrong type of syringe assigned to tool
holder.
Check the syringe parameters to ensure that
the correct syringe type is assigned to the tool
holder. Verify the scale length parameter.
Syringe needle penetration depth in
vial incorrect.
Check the syringe needle penetration depth in
the sample vial.
Syringe plunger polymer tip worn out. Manually check the tightness of the polymer
plunger tip. When in doubt, replace the
plunger.
Glass barrel cracked.
Check the integrity of the syringe. When in
doubt, replace the syringe.
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