I have GC (8890) MS (5977B) with a PTV at the back inlet I am not seeing any peaks so I tried the troblershooter. Ran a leak & restriction test I got a result that I have a restriction.
I am only using the back inlet.
I have checked the back inlet isn't blocked, the liner is seated correctly, I get flow through the column, the only restriction I think could be at the cross piece to the FID? So, I have re connected that too. No leaks, but when I run diagnostics I get:
Back inlet diagnostic tests-
Method pressure check- ok
Split vent test - pass
Septum purge test-
Basic control OK
Basline with purge off - restriction (I took column out, and checked He flow through liner- He Detected)
Leak/restriction test
Basic control OK
Back inlet flow actual = restriction when test for leak & restriction
Any idea what I might try?
Thanks for any suggestions.
