1260 G7111B Pressure drops after couple injections

Can you give more information(like start pressure, end pressure, is start and end pressure constant, is column conditioned before injection, is system purged enough)

If you provide picture of pressure in start and end, it would be good.

If pressure after couple injections unstable, may be problem with dirty solvent filters or malfunction of degasser.

 if pressure drop but stable Try to inject caffeine 10 times and calculate rsd of RT and square. If it is normal: nothing to worry about, maybe just dirty from previous injection.

Hi,

Was very normal but i found the issue.

The electronic active inlet valve was likely not functioning properly, causing a leak from the valve that wasn't visible after a few injections.

Thank you for your suggestion :) 

Hi,

Was very normal but i found the issue.

The electronic active inlet valve was likely not functioning properly, causing a leak from the valve that wasn't visible after a few injections.

Thank you for your suggestion :)