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Septum purge shutdown

http://www.chromforum.org/viewtopic.php?t=23102

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Septum purge shutdown

Posted: Tue Jul 30, 2013 1:59 pm
by rlsmith
GC/MS 7890 has been shutting down due to inlet pressure. It seems unable to purge thus will not move onto next vial.
I have changed vent copper line and filter and it ran 20 vials then the same thing (liner/septa, septa nut all changed as well).
has anyone had a problem with the analogue valve malfunctioning so that it is physically unable to open valve? Any suggestions greatly appreciated.

Re: Septum purge shutdown

Posted: Tue Jul 30, 2013 2:57 pm
by Peter Apps
Is the pressure too high or too low ? Have you checked for leaks ? - using a leak seeker not the onboard diagnostics.

Peter

Re: Septum purge shutdown

Posted: Tue Jul 30, 2013 3:03 pm
by rlsmith
It is too high. Hovering at 32-33psi. Previously started run at 17.5.
No leaks found

Re: Septum purge shutdown

Posted: Wed Jul 31, 2013 7:14 am
by Peter Apps
A stuck back pressure regulator on the split is a distinct possibility. Check for flow out of the split vent. What do the pressure and the split flow do if the inlet is in splitless mode ?.

Peter
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