SCREENSHOT OF AGILENT CHEMSTATION CONFIGURATION SERIES
Hydraulic system: Two dual piston in series pumps with proprietary servo-controlled variable stroke drive, floating piston design and active inlet valve.Recommended pH range: – 12.5, solvents with pH > 2.3 should not contain acids which attack stainless steel.
Hydraulic system: Dual piston in series pump with proprietary servo-controlled variable stroke drive, floating pistons and active inlet valve. Better for GLP - built-in leak and pressure test with graphical presentation of pressure profiles, and early maintenance feedback. Wide flow range - up to 10 ml/min for broad HPLC work, including semi-preparative separations. Seal wash option for high salt mobile phases keeps maintenance to a minimum for lower operation costs. 
Durable - stainless steel, titanium, gold, ruby, sapphire, ceramics, PEEK and PTFE ensure long lifetime. Ease-of-use - handheld control module lets you enter operating parameters fast, store methods easily and display pressure profile, diagnostics and task-oriented information. With high-speed proportioning valve and pre-configured vacuum degasser, for convenient low-pressure mixing of up to four solvents and highest flexibility in solvent choices. An inlet-valve electronically activated and synchronized to piston stroke - eliminates vapor formation with volatile solvents and is maintenance free. This design with variable stroke volume allows pulse-free solvent delivery and efficient mixing. 
The HP / Agilent 1100 HPLC series is the current model and arguably the best design in the industry because of the optimized design of the quaternary pump ensuring virtually pulse-free and stable solvent flow, with dual floating pistons in series, precisely servo-controlled.
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