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- Posts: 4
- Joined: Mon Sep 24, 2018 9:35 pm
I'm working on an Agilent 7890B, which is coupled to a 5977A and I'm experiencing pressure issues.
At the start of a sequence, I have a foreline pressure of ~45mTorr and notice it rises above 100mTorr, approximately 90 seconds into the run. The pressure then returns to normal before it reaches the solvent delay (3mins). I suspect a leak, so I've changed the septum, liner and column ferrules and I've also vented the MS and checked the seals, but the issue persists. Any suggestions on where to look next?