Used AGILENT G1312A 1100 Series

Specifications:

Hydraulic system: Two dual piston in series pumps with proprietary servo-controlled variable stroke drive, floating piston design and active inlet valve
Setable flow range: Setpoints 0.001 – 5 ml/min, in 0.001 ml/min increments
Flow range 1 – 5.0 ml/min
Flow precision: < 0.3 % RSD (typically 0.15 %), based on retention time, at 1 ml/min
Pressure: Operating range 0 400 bar (0 – 5880 psi) up to 5 ml/min
Pressure pulsation: < 2 %amplitude (typically < 1 %), at 1 ml/min isopropanol, at all pressures > 1 MPa
Compressibility compensation: User-selectable, based on mobile phase compressibility
Recommended pH range: 0 – 12.5, solvents with pH < 2.3 should not contain acids which attack stainless steel
Gradient formation: High-pressure binary mixing, delay volume 180 – 480 μl without mixer, 600 – 900 μl with mixer, dependent on back pressure
Composition range 1- 99 % or 5 μl/min per channel, whatever is greater
Composition precision < 0.2 % SD, at 0.1 and 1 ml/min
Control and data evaluation Agilent ChemStation for LC Control and data evaluation

Can be sold as an individual component or as part of a complete stack