we are struggling with drift in sensitivity (dropping peak amplitude/area)
on our FinniganMAT Delta+. Re-focusing easily recovers the usual
sensitivity, but over the next 3-4 days this will drop by at least 50%.
We run in continuous flow-mode. No signs of any leaks, and nice peak shapes.
The problem has appeared quite suddenly, but could perhaps be due to a
dirty IS? Any suggestions.