Combipal z-axis errors

Discussions about GC and other "gas phase" separation techniques.

5 posts Page 1 of 1

I'm certain this has been discussed in the past, but I can't seem to find a post. We have a Varian 3800 with a combipal attached for headspace analysis. We are having problems with our 20 mL vials. The arm is having difficulty returning them to the sample tray. I believe it's because the caps are misaligned. We are using a restek brand of crimp caps. It appears that slight angles on the caps are causing our problems. What's recommended for this system?

I use P/N: 502 370

from: on all of my combipal-type samplers (old LEAP, Agilent, EST Analytical). All rely on a magnet for transporting the vials from the tray to the incubator and back, etc. These are nice because they're a combination of aluminum and steel. You can decrimp them to dispose of the contents of the vial before trashing the vial.

I get them through VWR Scientific but it's always a bit of a hassle because they don't appear in the VWR online catalog. We always have to refer back to the old PO number to get the right VWR P/N.
The only explanation I can think of is you are using nonmagnetic aluminum crimp caps or you are not putting the magnet on the injector or your programmed coordinates are off.
MACHEREY-NAGEL #702774 works well for me.
Check that you are not crimping the caps too tight, or holding the crimper at an angle to the vial when you crimp.

Peter Apps
5 posts Page 1 of 1

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