Postnova model 1130 isocratic pump

Eluent delivery system for FFF and SEC

The Postnova model 1130 pump is an isocratic dual piston eluent delivery system optimized for FFF. It employs short piston stroke technology with two check valves.

The delivery piston works with a 2 mm stroke length, the compensation piston with 1 mm. The nearly pulseless solvent discharge of the PN1130 results from the high stroke frequency/low stroke volume (20 uL) and the use of a compensation piston. While the delivery piston discharges the solvent volume, the compensation piston, located on the pressurized side, collects half of the volume. During the return movement of the delivery piston, the collected volume is discharged from the compensation piston.
The microprocessor controlled speed regulation leads to a highly stable motor speed. In contrast to standard regulators, the microprocessor is able to compensate continuously the compressibility of the eluents through a computerized program.

This results in a constant volume delivery throughout the entire delivery range. The microprocessor technology also offers the possibility to handle the programming, application and control of an instrument in a simple way. Through the alphanumeric display, the operation parameters are shown in clear letters. The user can easily control or change the data. To simplify operation, the number of function keys is kept at a minimum.