Pressure problem with UPLC Acquity BSM
Hi,somebody can help me about to risolve the problem that is showed in attached file?1. I have changed all seals;2. I have changed pump head of primary A with pump head of primary B and I have seen the same problem on the primary A;3. I have replaced pump head primary B with Head of accumulator and I have seen the problem to the accumulator, so I have understand that the problem probably is on the head.As, with the channel B, I generally use MeOH:ACN + 0.1 % Acetic acid I have changed too the seal wash housing, but I have always the same problem.4. I washed the pump head with methanol in the sonicator but the problem don't change.