Quaternary pump showed a wrong, non-responsive pressure reading even if no flow, how to fix it? It was used about 1.5 years ago without this problem. Thanks.
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Quaternary pump showed a wrong, non-responsive pressure reading even if no flow, how to fix it? It was used about 1.5 years ago without this problem. Thanks.
Hi
Follow above link to check where is problem.
First, u should see frit of purge valve.
Did any PM done after one year or not?
Thanks for your suggestion! No PM was done in the past year due to software problem. Now there is no computer issue, but pump showed a pressure 200+ bar even if it does not run and no flow at all. And the pressure does not change AT ALL after turning on the pump and flow is increased from 0 to 1 ml per min. Could the pump sensor problematic?
Thank you for your detailed answer and guidance. The issue may be clearer to you experts --- even if without column, with purge valve open, the showed pressure number is still there, looks like a NOMINAL pressure but actually should be zero...
Thanks,
I believe it is regular case: two solvents --less polar one is ACN with 0.1% TFA, more polar one is water with 0.1% TFA. Thanks for your suggestion,
If assume everything okay but still pressure not zero then doubt will go on Damping unit of pump because damping give pressure signal to LPM board of pump.
I will suggest to call your local agilent suppprt to check this because pump need to open to see exact root cause.
Thanks
THANKS ISHITIYAK! Good to learn about this damper part. Also of note, the pumps still work and the flow rate can be controlled --- just the pressure reading stays wrong. Perhaps it is tolerated somewhat and we can use it temporarily before a thorough fix... Thanks again for your suggestions and prompt replies!
Hi andrew3025
Not sure how well a pump would react to being left with TFA in it. I would definitely give the system a good long flush with water (possibly hot water), and maybe then isopropanol, to see if there is some residue causing the faulty readings.
Other than that, it looks like a repair job is needed
Andy
Hi andrew3025
Not sure how well a pump would react to being left with TFA in it. I would definitely give the system a good long flush with water (possibly hot water), and maybe then isopropanol, to see if there is some residue causing the faulty readings.
Other than that, it looks like a repair job is needed
Andy
Thanks Andy for your suggestions! I will try to do more flush.