Chromatography Forum

I am very new to this site. I checked for the past questions, but I could not find any similar topic, so I am posting this question.

Yesterday, I put a liner #5190-2293 (seems to be developed for Agilent 7890 but can be used in Agilent 6890) in Agilent 6890. We have a old flip top port with gas lines attached.

After I closed the top, I could not achieve the pressure in the inlet, and when I re-opened the port, I found the top part of the liner to be shattered (above the o-ring).

The liner was installed all the way to the bottom, and we never experienced this before with the old liners.

Has anyone had similar experience of the liner getting chipped, cracked, broken or shattered at the top?

Should we just avoid using any other liners that are developed for Agilent 7890 in future in 6890?

Also what kind of cleaning will be required after you find that the liner was broken? What kind of precautions are needed?

Thank you all for your help in advance.

Check with Agilent if that liner can be used for your instrument model. Does it stick out further than the liners you normally use?

For cleaning, just remove all the glass from your system. I'd disconnect the column and use a lamp to visually check the inlet. Use a vacuum cleaner and/or a dust spray remover (the kind of sprays you can clean computer parts with). Afterwards, clean the inlet like you'd normally do. I wouldn't expect any consequences for your system.

Turn the GC oven off and open the door. Loosen and remove the GC column nut from the inlet. Remove the insulator and the gray reducing nut that
houses the gold seal and washer from the bottom of the inlet. Clean the inlet.
Reassemble the inlet with a new gold seal, washer, liner, and a new ferrule on the column. Make sure that the column is re-cut prior to installation.
That's it.

Great, thank you very much for quick replies.
We will check with Agilent on whether the liner can be used in 6890.

I will follow the cleaning methods suggested.

Thank you very much!

Yes, very easy to clean the Agilent injection port when this happens(provided it isn't the PTV).

I have had liners shatter before. Sometimes it is just that they have a scratch or crack near the top and when installing the top of the port you get it a little crooked and it snaps it off. Also if a small piece of debris falls into the port while it is open the liner will stick up just a little and cause it to happen.

Regular split/splitless ports should be the same dimensions between the 6890 and 7890, but not sure how well the flip tops protect from having the top part being misaligned.

I also had a few liners break at the top. We had both screw-on inlet nuts and the flip top inlets on our 5890 and 6890 GCs.