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- Posts: 7
- Joined: Tue Jun 06, 2017 8:36 pm
I am trying to work with GP50 Dionex gradient pump (PEEK), please find the scenario as below:
1. There was a leak in outlet check valve housing of the left side pump head. So, I removed the housing and cartridges from the pump head and reinstalled it with new check valve.
2. No leaks were observed from the outlet check valve. Now, the leak happened in front of the pump head. So I replaced the piston seal as per the instructions given in GP 50 gradient pump Dionex manual.
3. After I reinstalled the pump head, no more leaks were observed. So I assume that the primary problem was due to the piston seal. But, now the pump is not priming properly.
The minute I open the priming valve, I get a beeping alert with a display message "High Pressure Limit Violation".
When I close the prime valve and try to run the solvent (DI water) through the column, it works just fine. Initially I observed the pressure to fluctuate between 30 to 1800 psi, after 5 mins it slowly settles down to around 1700 psi. Flow rate: 1mL/min.
I am not sure why I am receiving high pressure violation message specifically when I am trying to prime my system. I just got introduced to IC and I am not sure where I what went wrong. I did everything as per the manual and I double checked that I reinstalled all the parts correctly. The piston was cleaned with IPA before re-installation.
I am reaching out to get some help from this community, your suggestions and comments are much appreciated.
PS: I tried calling TF but then I was informed that they do not provide technical support to GP50 gradient pump issues anymore.
Thank you.