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Problem of needle plug by septum in gas tight syringe
Posted: Tue May 25, 2010 7:38 am
by haiedc
In analyzing gas using gas tight syringe (manual injection), we meet the problem of needle clogging rather frequently (almost every day). It's all septum debris inside the syringe. For micro syringe (liquid) we almost never have such a problem.
Have you got any idea how to overcome this case?
Posted: Tue May 25, 2010 10:05 am
by Peter Apps
Use a cone-tipped or dome-tipped needle, not the bevelled tip that for some reason is the default on micro-syringes despite its being the worse design for tearing chunks out of the septum.
Peter
Posted: Tue May 25, 2010 10:46 am
by CE Instruments
Dome tip with side hole
Posted: Wed May 26, 2010 7:09 am
by haiedc
Thank you both for the help. But I am still confused why use small syringe (5-10ul) that problem rarely happens and the needle is exactly the same: pointed bevelledly.