Massive pressure drop during injection on Waters alliance!
Posted: Fri Apr 12, 2013 6:34 pm
HI
We have a waters alliance with injection reproducability issues, it will inject OK for 10 injections and then an anomaly injection occurs where the response is about 20% the height it should be.
I have narrowed it down to this:
During an injection the pressure drop goes from 1100 psi to 300 psi when the alliance screen says "waiting for trigger" (when V3 opens)
A similar observation on a working system reveals a small pressure drop (2500 to 2100)
any ideas?
We changed out seal pack, adjust seals passed, we purged injector with methanol already
We have a waters alliance with injection reproducability issues, it will inject OK for 10 injections and then an anomaly injection occurs where the response is about 20% the height it should be.
I have narrowed it down to this:
During an injection the pressure drop goes from 1100 psi to 300 psi when the alliance screen says "waiting for trigger" (when V3 opens)
A similar observation on a working system reveals a small pressure drop (2500 to 2100)
any ideas?
We changed out seal pack, adjust seals passed, we purged injector with methanol already