Firma:              Postnova

Modell:            PN 1121

Kommentar:    Dokumente engl.

The HPLC-Pump PN 1121 is a dual piston solvent delivery system. lt works with short piston strake technology and only two check valves. This results in the low pulsation of a dual piston pump combined with the reliability of a single piston pump (difficulties in solvent delivery systems caused mainly by malfunctioning of the valves).

The delivery piston works with a 2 mm stroke length, the compensation piston with 1 mm. The nearly pulseless solvent discharge of the PN 1121 results from the high stroke frequency/low stroke volume (20 µl) and the use of a compensation piston. While the delivery piston discharges the solvent volume, the compensation piston, Iocated on the pressure 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 Ieads to a highly stable speed of the motor 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 controlling of an instrument in a simple manner. 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.

Basically, the user has the choice between two operation modes. The delivery with "Constant Pressure" and the delivery with "Constant Flow". The operation modes can be programmed with the following parameters:

·        Constant pressure in MPa

·        Constant flow in ml/min

·        Minimum pressure level

·        Maximum pressure level

·        Maximum flow

·        Compressibility factor

·        Maximum run time

·        Delay time

·        Programmable start delay time and stop delay time.

The HPLC pump PN 1121 is equipped with a built-in diagnostic system. This continuously controls the following parameters:

·        Power failure

·        Program memory

·        Maximum and minimum pressure levels

·        Maximum flow

·        Motor function

Illogical data entered by the operator will be ignored by the processor’s logic control and indicated by flashing of the display.

Specifications

Flow Rate:

Analytical:                           0.10 to 9.95 ml/min

Micro:                                  0.02 to 4.00 ml/min

Preparativ:                          0.40 to 40.00 ml/min

Pulsation:                            Less than 1%

Maximum Pressure:

Analytical:                           40 MPa (400 bar)

Micro:                                  40 MPa (400 bar)

Preparativ:                          20 MPa (200 bar)

Display:                               LCD; alphanumerical; 2 x 24 characters.

Compressibility Factor:      Chosable from 0.7 to 1.0.

Operation Modes:               Constant flow

                                           Constant pressure

Remote Control:                 Flow, start, stop.

Run Time:                           00:01 to 99:59 h.

Delay Time:                        00:01 to 99:59 h.

Safety Control:                    Minimal-Maximal-pressure

                                           Power supply

                                           Logical data input

Error Message Transfer:    potential free relais contact

                                           accustic and optic signal

Processor:                          Z 80

Power Requirements:        220 or 110 V; 50 - 60 Hz

Dimensions:                       258 x 148 x 350 mm

Weight:                               8 kg