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Sample Introduction
Problem Possible Cause(s) Suggested Action(s)
Bent plungers or stuck syringes
• Particles such as dust, leftover samples, salts,
metal, or glass can fill the narrow gap between the
plunger shaft and the inside wall of the barrel.
• Try PTFE-tipped plunger syringe.
• If the plunger's movement feels "gritty," remove the
plunger from the barrel, flush the shaft with
solvent, and wipe it dry with a lint-free cloth. Then,
carefully insert the plunger back into the barrel.
Finally, submerge the tip of the needle into a
container of solvent, and cycle the plunger to pull
the solvent into and out of the barrel.
• Never cycle the plunger in a dry syringe.
• Do not "mix & match" plungers and barrels.
• Always clean syringes after use immediately.
Bent needles
• Improper needle alignment.
• Narrow-gauge needles (26 gauge) bend more
easily than larger (23 gauge) needles.
• Needles tend to bend when inserted into the
sample vial - not the inlet port. This can be caused
by septa that are too "tough."
• If the needle has been slightly bent when mounted
in the autosampler - or when the syringe is
installed into the autosampler - then it is more likely
to bend further when it pushes through the septa
on the sample vial caps.
• Use only Agilent autosamplers.
They are precision-designed to ensure proper
alignment with the Agilent inlet.
• Use 23 to 26-gauge tapered needles to get the
combined benefits of greater septa life and fewer
bent needles.
• Only use Agilent vials and septa.
Syringe Troubleshooting Guide
Proper care, cleaning, and handling of each syringe will help ensure correct performance and long life. When cleaning your syringe,
it is best to use solvents that effectively dissolve the sample you are working with. Try to avoid cleaning agents that are alkaline, contain
phosphates, or are strongly acidic.
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