Front inlet pressure shut down

Question

Dear all, I m disturb with these message coming from my gc. 7890 a. ( see photos ). Can any one help me to fix it please ? I m sending also the picture of the manometer of the gaz

ISH · Answer

Hi,

First, You should check below things:

You can increase your helium pressure upto 100psi ( check picture 111713).

Check column is okay. Means it's not broken.

May be inlet is leaking so better replace septa.Check your inlet is properly sitting on top of gc.

You should check column connection of inlet and detector.

If you did not change vent filter from long time then better to change this.

garyb007 · Answer

You have an inlet leak. Have you done maintenance lately? If you haven't changed the septum in awhile it could be that or the nut may have loosened up and needs tightened a bit or the column nut may have loosened.

james_jenkins · Answer

Hi rogermoise, Have you performed any inlet maintenance? Most often inlet shutdowns on methods that are functional are due to leaks. I have attached a couple of links that may help you. https://www.agilent.com/cs/library/slidepresentation/public/2017Seminar_GC_Optimization_and_Maintenance_Techniques.pdf GC Troubleshooting Video Series: Replacing Your Liner, Septum and O-Ring Regards James

Front inlet pressure shut down

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