Inlet pressure shutdown...then tuning doesn't work?!
Posted: Wed Aug 05, 2015 4:25 pm
I have a 7890a/5975c GCMS system that has been running like a peach, when the inlet pressure started becoming unstable and ended in an inlet pressure shutdown. I replaced the liner, o-ring, and septum and was able to get pressure back. However when I went to perform an air and water check it failed halfway through and gave me an error message "cannot achieve constant peak widths". I cannot tune at all and when I look at the profile the masses are all over the place.
The source was recently cleaned so I don't think that is an issue, and the response is the same on either filament, which were just recently changed.
I changed the column nut/ ferrules on both sides of the column and will see if I can tune after that.
My concern is that it is something electronic in nature, maybe the front board has a short.
If anyone can help I would appreciate the advice!
The source was recently cleaned so I don't think that is an issue, and the response is the same on either filament, which were just recently changed.
I changed the column nut/ ferrules on both sides of the column and will see if I can tune after that.
My concern is that it is something electronic in nature, maybe the front board has a short.
If anyone can help I would appreciate the advice!