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Re: Increasing FID response over time (GC 7890a)
james_jenkinsJan 15, 2019 5:16 AM (in response to oshin-sebastian)
Good Morning oshin-sebastian,
It looks to me like there is more sample making it on column . I haven't seen a FID problem that I can think of that would cause the response to increase over time. You may want to change the split vent cartridge on the chance this is playing a role.
Regards
James
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Re: Increasing FID response over time (GC 7890a)
oshin-sebastian Jan 15, 2019 9:17 AM (in response to james_jenkins)Hello James,
Thanks for your reply.
Why do you think that split vent cartridge can cause problems?
Regards,
Oshin
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Re: Increasing FID response over time (GC 7890a)
james_jenkinsJan 15, 2019 9:54 AM (in response to oshin-sebastian)
1 person found this helpfulHi Oshin,
I suggest that the split vent cartridge be eliminated as a concern as it is a consumable that, if restricted, can increase response. It is usually not variable over the run and recovers for the next, usually its a constant. The cartridge is suggested as a regular maintenance item and I have seen some odd effects over the years if they are not maintained . In your case I suspect the issues may lie elsewhere, but I wouldn't want to have you pursue in depth troubleshooting on your side without the possibility of this being a simple maintenance issue.
Regards
James
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Re: Increasing FID response over time (GC 7890a)
oshin-sebastian Jan 15, 2019 9:40 AM (in response to james_jenkins)Hi James,
Yeah I got your point. Thanks.
Cheers!
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Re: Increasing FID response over time (GC 7890a)
abdurJan 15, 2019 10:54 AM (in response to oshin-sebastian)
Hi Oshin,
I would be curious if doing a blank run would still show you a peak or not.
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Re: Increasing FID response over time (GC 7890a)
oshin-sebastian Jan 15, 2019 11:21 AM (in response to abdur)Hello Abdur,
Yeah, I have tried blank runs and more over baked the column over night. I have not seen any peaks during this operations.
Regards,
Oshin
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Re: Increasing FID response over time (GC 7890a)
oshin-sebastian Jan 16, 2019 2:25 AM (in response to oshin-sebastian)1 person found this helpfulHello Guys,
Good news. I managed to rectify the problem.
I problem was at the exit of the capillary column (part where it connects to the FID). There I found significant leak. May be this was the reason.
Additionally, I cleaned the FID Jet, trimmed the column, increased the valve temperature to 200 C, and put a new inlet liner.
Best regards,
Oshin.
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Re: Increasing FID response over time (GC 7890a)
james_jenkinsJan 16, 2019 5:24 AM (in response to oshin-sebastian)
Nice work. I amrked your answer as correct, feel free to update us if there are further developments.
Regards
James
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