Agilent 1200 Series G1311A Quaternary Pump

This used Agilent 1200 Series G1311A Quaternary Pump is a four-channel solvent delivery module designed for gradient HPLC methods requiring precise mixing of up to four mobile phases. It is a workhorse component of the Agilent 1200 platform, delivering accurate low-pressure gradient formation and stable flow for routine and complex separations alike. The pump has been tested and kept in operational condition, ready for integration into an existing 1200 or 1100 series LC stack. Labs performing pharmaceutical analysis, environmental testing, or academic research depend on this pump for flexible gradient method development, since the quaternary design allows solvent blending without manual remixing between runs. It pairs naturally with Agilent autosamplers, column compartments, and detectors, and it is fully controllable through ChemStation or OpenLAB CDS software, allowing it to be dropped into a running method queue with minimal requalification effort. Buying this pump used offers a practical way to expand LC capacity or replace an aging quaternary pump without paying new-unit prices. It is a good fit for labs already standardized on Agilent hardware that want a proven, compatible module for gradient chromatography work.