GC Agilent 7890A

[Cyclohexane2014]

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

[dblux_]

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

[kubowicz.tomasz]

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

[ATAlR]

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?

[Cyclohexane2014]

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

[Cyclohexane2014]

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

[Cyclohexane2014]

Where you work guys ? Company ? GC-MS ?