What could be the possible reason for high O2 (70%) and N2 (100%) in GC-MS?

We are using a GC with ISQ 7000 Mass Spectrometer. Today we did an air and water check and it was higher than usual, so we just tightened the ferrules. In the last two days, however, the N2 and O2...

16 August 2021 6,768 8 View