Shimadzu Prominence issue
Posted: Fri Dec 02, 2011 2:37 pm
by qfiviera
I have the same problem as Mattias from Denmark had posted. Sometimes with 100% Acetonitrile in a line, the pressure varies and the mix is not OK. Our supplier and technical service changed the valves for new ones that Shimadzu recommended but didn´t solved the problem. Anyone knows why this happen?
Re: Shimadzu Prominence issue
Posted: Wed Dec 07, 2011 10:00 am
by Mattias
I have understood that it is common that acetonitrile can make the little ball inside the check valve too "sticky". If the ball cannot move freely, than you get pressure variations.
I am now testing to use 90/10 of acetonitrile/water instead of 100% acetonitrile, and so far it seems to work. But I am not sure yet.