Chromatography Forum

I'm working the GC Agilent 7890A ...
Error " Front inlet pressure shutdown"
What measures must be taken in such situations?

Temporarily increase split ratio, then find leaks (inlet, column).

Hello

Possible reasons:

1.Empty gas cylinder (carrier gas) or pressure too low.
2.Leak in inlet (septum, column nut, split vent trap)

Regards

Tomasz Kubowicz

Assuming you use S/SL EPC controlled inlet:
- Check that you have pressure at your gas cylinder
- Is column correctly installed?
-Is this happening during gradient run (not enough output pressure in cylinder)?
- Take new graphite ferrule put it in nut and push it on table, so you don't have a hole in ferrule any more (even better if you have no-hole ferrule). Tight it in inlet and observe the stability of pressure.
- Set pressure 0 to Inlet, and close the gas cylinder, observe the pressure in the line, Is it falling => leak in tubing, or defective EPC?
- Turn pressure back to inlet and open cylinder, open inlet like when you try to change liner. Tight the weldment with finger and observe the pressure is it stable?

Thanks guys!
We are not use gas cylinder./we use gas generator...

Hello

Possible reasons:

1.Empty gas cylinder (carrier gas) or pressure too low.
2.Leak in inlet (septum, column nut, split vent trap)

Regards

Tomasz Kubowicz

thanks Tomasz

Where you work guys ? Company ? GC-MS ?