Discussion Category: Ion Chromatography
Fluctuating Pressure
The pressure on our unit is fluctuating between 1200-1700 and is constantly jumping 20-30 psi. Every time it makes a knocking sound it drops by about 300 psi for less than a second. Any suggestions?
Reply bycemchem
I had something like after instrument had many months of use. This might happen with bad check valves, bad pistons or piston seals, but mine was a bad bearing in the pump drive module. It is expensive to replace the pump module.