Accela pump pressure problems

[nitrendipin]

Hello!
I've got two used accela pumps that should be used as a replacement for jasco 980 pumps in our unit. The problem is that they both show the same pressure fluctuations (about 30 bar) at a flowrate of 200µl/min . I already changed the piston seals, but that didn't solve the problem. I also checked the checkvalves; they seem to be fine.
Does anyone have experience with accela pumps or is experiencing the same symptoms?
Best regards

[coffee bean]

My impression is that you have to prime the pulse dampeners. If they are dry, they won't function as designed. Check the manual for detailed instructions.

[nitrendipin]

I have also considered that and primed the pulse-dampener with isopropanol for approximately 20 minutes. I also tried Methanol. The only thing that I didn't do is have a syringe installed whilst priming. Maybe there should be some backpressure during that process. I will give that a try and post my results here!

[elsico]

Was same problem with customer Accela pump. Prime it with water/Acn/water/isopropanol. Not much success, was about 50-60 bar and best result was on isopropanol with about 15. No leaks and no ideas. So my suggestion to take back to jasco pump and add SSI™ LO-Pulse™ damper. Best solution and don't waste your time.

[leadazide]

At what pressure are you seeing the 30 bar pressure difference? Sometimes I have succesfully run the pump up to around 800+ bar to "stick everything together" and after that perfomance was improved..

[vogelius]

If you have a flow trough the system, try to clean with Water-10% HNO3-water, very god for checkvalve problem what I think it is.

BR