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Fluctuating pressure
Posted: Thu Oct 23, 2008 4:59 am
by thohry
Hi all,
I have this problem when running Hilic column: the pressure is about 94 bars, but the reading is rather fluctuating. I illustrate in the picture below.
Have anyone met this problem ?.
Thanks
Posted: Thu Oct 23, 2008 4:37 pm
by sassman
That amount of pressure fluctuation could be normal for your LC system. Did it used to be smaller? With pressure fluctuations, I always try to clean the check valves first by sonicating in isopropanol. Sometimes a small particle can get in the valve and prevent it from seating properly. Bad seals can also cause pressure issues. But, like I said, this could be normal for your LC. We have a number of LCs that fluctuate up to 25psi or almost 2bar in normal operation.
Posted: Thu Oct 23, 2008 6:07 pm
by Consumer Products Guy
I don't use that type of column, but at 94 bar, 2-3 bar fluctuations can be normal, 1 looks pretty good.