Preventive Maintenance and Troubleshooting
Chromatographic symptoms
129
Syringe is worn or dirty
If the syringe looks dirty or the plunger is sticking, clean the syringe with an
appropriate solvent, or follow the syringe manufacturer’s cleaning instructions.
If the syringe seems worn, replace it.
Samples (vial-to-vial) are of immiscible types
In this situation, the sample and solvent washes may not rinse the syringe
properly. Either increase the number of wash cycles or use a solvent that rinses
a variety of sample types.
No signal/no peaks
Syringe plunger is malfunctioning
Verify that the button of the syringe plunger is fastened properly by the plunger
screw. If the plunger screw is loose, tighten it. See “Installing syringes” on
page 52.
Also, check the syringe needle for plugging. If the syringe is plugged, replace or
clean the syringe.
Sample level is too low in vial
If there is no or very little sample in the vial, the needle may not be able to
reach it. See “Filling sample vials” on page 29.
Sample is viscous
If the sample is viscous, try the following:
• Increase the viscosity run parameter. See “Viscosity delay” on page 60.
• Use the tray quadrants to warm the sample.
• Dilute the sample in the appropriate low-viscosity solvent.
• Turn off tower fan.
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