G4226A Autosampler - leaking needle assembly-loop capillary

I have replaced the needle assembly on a G4226A Autosampler. There is now a leak from the fitting of the loop capillary. I have tightened the fitting of the loop capillary as tight as I can, without risking damage. After 6-7 attempts, with the same new needle assembly, it is still leaking. It is a small leak that isn't affecting the system pressure. Over time, the liquid will reach the leak detector.

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jhagel over 1 year ago +1 verified

“I just wanted to follow-up to see if this issue is resolved. If so, please come back to the post and click Verify Answer on the best response so it will make the solution more visible. If you still need…

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0 kbusch over 2 years ago

Hey Mike, Agilent 1290 Infinity Autosampler User Manual see page 141. Have you used two wrenches to do the tightening (one securing the needle assembly and the other screwing on the sample loop)? Also, ensure there is no damage to the fitting on the sample loop.
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0 MikeL over 2 years ago in reply to kbusch

Good morning, I am using two wrenches. Even pulling on both wrenches (in opposite directions) as tight as I can. After that I need to reposition the needle assembly to get the needle back in alignment.

I haven't yet checked the sample loop fitting.
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0 MikeL over 2 years ago in reply to MikeL

The sample loop fitting does not seem to have damage. I did try a second new needle assembly this morning and still had leakage. I have exchanged needle assemblies before on both of our 1290 systems without problems.

I am not trying to change the sample loop. My difficulty there is that the Lab Advisor is not setup. (That decision is above my pay grade) Is there a way to exchange the sample loop without going through Lab Advisor?
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0 jhagel over 2 years ago in reply to MikeL

How did you replace the needle without lab advisor? You need it to replace the needle.
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0 MikeL over 2 years ago in reply to jhagel

I can use the Mass Hunter acquisition screen to put the sampling arm into maintenance position. From there I can move the sampling arm into position to change the needle and needle seat. However, the sampling arm is too close to the autosampler ceiling for me to easily handle or see the loop cap.

We have the basic version of Lab Advisor installed. The Instrument Control and Service & Diagnostics options are greyed out.
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0 jhagel over 2 years ago in reply to MikeL

Make sure you get out of MassHunter and kill the engines before trying to do anything in Lab Advisor. What version of LabAdvisor do you have? You are able to update to the latest. If that computer is on the internet, go to configuration and market and you will see the latest revision listed. Choose the download button. If not the latest is on Agilent.com
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0 jhagel over 2 years ago in reply to MikeL

Make sure you get out of MassHunter and kill the engines before trying to do anything in Lab Advisor. What version of LabAdvisor do you have? You are able to update to the latest. If that computer is on the internet, go to configuration and market and you will see the latest revision listed. Choose the download button. If not the latest is on Agilent.com
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