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Bad pump that passes diagnostic tests?

Question asked by aew on Aug 9, 2019

Hey guys,

Our gradient test has been failing, got a new MCGV, replaced inlet and outlet filters, rotor seals, frits, switched degassers, switched lamp, cleaned flow cell, and still get a lot of drift...particularly when more than one channel is used. Pump pressure and leak tests Pass in LabAdvisor.  See attached pic.  All channels are in the same mobile phase, with varying ratios (25 to 75%) in 30 increments, A with B, C with D. Anyone ever seen this, and how to remedy?  

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