Chromatography Forum

It is very likely that the flame tip stem was cracked inside the ferrule, which would account for the flame not lighting properly. If so you have solved the problem by accident. It is also possible that you cracked the tip while removing it - which is why I advise eliminating other possible causes of FID problems before you dismantle anything.

Just putting the flame tip into methanol could not break it, but I doubt that it would do any good either - the kind of deposits that obstruct flame tips are not soluble in methanol.

Peter

Thanks for your comments i changed Jet with new ones, and everthing is OK.

That's good news, thanks for the feedback.

Peter

Hi guys
I'm using GC-2010 Fid (Shimadzu). At the beginning there was no problem in air flow, but now (after 30-40 runs) now the FID ignition is failed . I checked the system and found some problem in air flow rate. i.e the the air flow rate set value (400 mL/min) can't be maintained. I checked the gas pressure, likage, Fid port but I failed to solve this problem. My set value for Hydrogen flow= 40 mL/min, For make up gas= 30 mL/min . I'm working with glycerol derivatives. Column temperature = 40 Degree, FID temp= 300
Any suggestion is highly appreciated.
Thanks,

I know this is an old topic but today i experienced (and solved) the same problem Mayala had, so i'm writing it just in case someone else needs it.

After 3 months of analysis with GC-2010 FID i had the same air flow problem, the air flow can't be mantained and the flame doesn't ignite, also there is an air flow detected by the software even if the flow is set to 0.
This happens even if the gas pressure is within the recommended pressure (2.5-5 bar) and even if there isn't any leak in the system.
Basically the Air flow EFC (APC for shimadzu) goes "out of control" (like the diagnostic says) when there is an high pressure of gas (air in this case).
I solved my problem after hours of tries/leak checks simply by closing the gas valve completely and then opening it at the minimum, just to let a bit of air reach the gc.
Detector gas flows are the same as before (40 ml/min for hydrogen and 400 ml/min for air), now the flame starts without any problem and the air APC works like it should be.

In the end, the air APC went out of control with a pressure higher than the one it needs, even though it was the pressure recommended by the manual (it was 3 bar, right in the middle of the suggested range).

Hope it helps.

How nice of you to post this problem with the GC-2010 Fid (Shimadzu), Hornet.

Perhaps you should tell the Shimadzu technical service people about your solution.

best wishes,

Rod