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Autotune gcms nitrogen is high
Posted: Wed Jun 28, 2017 11:44 pm
by seet88
Hi all,
At May I encounter nitrogen bias high, then found out tat dftba vial is empty. Then refill, it look normal after that. However, after one month ltr, nitrogen become 44%. The interface is tighten well. May I know the root cause
Thanks
Seet
Re: Autotune gcms nitrogen is high
Posted: Thu Jun 29, 2017 6:32 am
by Rndirk
What about oxygen?
Re: Autotune gcms nitrogen is high
Posted: Thu Jun 29, 2017 8:35 am
by dblux_
... May I know the root cause
Thanks
Seet
A leak is the culprit unless you messed up with carrier gas (cylinder, trap).
Re: Autotune gcms nitrogen is high
Posted: Fri Jun 30, 2017 8:51 pm
by Steve Reimer
Did it appear when a tank was changed?
Helium has been known to have nitrogen in it. Even though you paid for it to be pure.
It could also be a leak between the tank and scrubber if you don't see oxygen.
Re: Autotune gcms nitrogen is high
Posted: Sun Jul 02, 2017 3:46 pm
by Consumer Products Guy
I'd plug the flow to the MSD and run the tune, see if that reduced the nitrogen. If so, that would isolate the issue to the GC; if not, to the MSD.