Hello,
I have another question regarding the GC, so we discovered recently that we have some pollution (solid particles) on the tubes and the the 6-port valve including a 100 µl sample loop. For the tubes we could somehow manage to clean it but we are not sure if we could clean the valve.
Could you please provide me with some advice.
Thank you !
Insert a blank sample, and analyse it. You will be able to know whether the contaminant is still there or not?
Hey Pravin,
Thanks for the answer but actually we already did that we are somehow sure now that it's the tubes and the valves that are contaminated, we can clean the tubes, but we want to know if there is a specific methode to clean the 6 port valve !
Hi Anissa
If you feel that valve is contaminated then, try solvent washing by putting the valve in inject mode only. If still your problem persist, then valve cleaning by service personal is mandatory.
The gas sampling valves on most GCs have a max temp too low to allow the user to "thermally clean" or bakeout the valves. In cases where I have had particulates get up into the tubing or rotor seal the solution has generally been to replace those components.
You can remove the stator face from the valve and clean/replace the internal rotor seal. Contact the manufacturer (probably valco) for more advice. It will be critical that you put it together correctly after repair, as the system must remain leak free and leak testing valves is not fun.
for cleaning you should do injection at the beginning of each run with blank ( solvent only ) for example : ( n-hexane) and you can do it 3 times until you see only the peaks of the solvent at the beginning.
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