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- Posts: 7
- Joined: Fri Dec 30, 2016 7:06 am
I am using 7890A GC and 7000 MSD. Yesterday i am realised after the injection, internal peaks does not appear in chromatogram. After that i tried autotune and air/water check. Autotune was ok. But Air and Water Check results was like this
PFTBA (69.00) 495032
Water 9622 1.94% <= 20.00% OK
Oxygen 243908 49.27% <= 2.50% ---
Nitrogen 909045 183.63% <= 10.00% ---
So i tried tighten the backflush,inlet and interface connections of column. It didn't work.And then vented the MSD, cleaned the ion source(it was monthly routine) and then pump down like 16 hours until the morning. But ıt didnt work. And then i read some topics from here and changed the helium cylinder and check the connections also. I dont have any solutions,i am waiting for your help.
By the way sorry about the bad english.