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

0.1 ‚ 5.0 ml/min

Flow precision

£ 0.07% RSD, or £ 0.02 min SD whatever is greater, based on retention time at constant room temperature

Flow accuracy

± 1% or 10 µl/min whatever is greater

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

1.0 ‚ 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

£ 0.5% absolute

Composition accuracy

± 0.15% RSD, at 1 ml/min