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Strange results from 6890N GC

Question asked by dheyaaldeen on Mar 1, 2020
Latest reply on Jun 9, 2020 by james_jenkins

Hi all

We are using GC6890N in our lab to analyze dry gas, the GC with TCD and FID and four columns   

Two weeks ago We noticed something strange in the results like a cycle.

N2 value it goes up and then goes back down.

Is there any advice to solve this problem?