problem with pressure and flow in Agilent 7890A

[karelmarcel]

Hello, i have a problem with pressure and flow in front inlet. Both values are varies every seconds (e.g. flow from 0,841 to 395,05) and it happen very fast. If i shotdown ChemStation, flow is constant. But when i open method and want to measure this will happen and that is end. I have not too much experiences with this GC and do not know where is the problem. Any ideas?

Thanks, Karel.

[R13]

Column, temperatures?
Flow, pressure?
Injection mode?
Trying to introduce new method or previously working method gone wrong?
Any maintenace/service immediately before problem appeared?
Any software upgrades on PC before problem appeared?

[karelmarcel]

Zdravi Decin do Prahy.

Column temperatures - 250°C
flow - 3 mL/min
pressure - 10,5 psi
injection mode - splitless
trying to work on previously method
nothing at all...i exchanged septum, looking for any leaks and nothing wrong

[AICMM]

This is weak, sorry, but try opening the default method in the Chemstation software and see if you get stability. If you do, save you default method with some other name (always leave that method intact) and start re-building your method.

Best regards,

AICMM