Firma:                   Merck-Hitachi

Modell:                L 7100

Kommentar:        Dokumente engl.

The Lachrom L-7100 HPLCm provides the highest possible degree of precision and reliability fo high quality analytical results. Corresponding to the requirements of modern quality assurance, it is equipped with intelligent function control and incorporates a documentation facitility. Versatile in its applicaton, it has become a universal pump module in the HPLC laboratory.

Apart from its control by the D-7000 HPLC System Manager, the L-7100 can also function as a stand-alone system controller.

Precision and Reliabilitly

The L-7100 has been designed along the lines of the proven serial dual­piston principle, characterised by an extremely constant flow rate, low pulsation and reliable delivery of all commonly used solvents. Moreover, the L-7100 is able to form solvent gradients with high precision and accuracy. Each individual component and the finished Instrument are Subjett to stringent quality control measures. A validation certificate and the manufacturer's test report docu­ments that all functions and specifi­cations haue been fulfilled.

Versatile in Application

User-friendly programming via key­board and LCD dialogue enable the L-7100 to be used as

•            Isocratic HPLC pump

•            Quaternary low-pressure gradient pump in conjunction with a gra­dient accessory

•            High-pressure gradient pump in conjunction with one or two further L-7100 pumps and as

•            Column packing device at con­stant pressure.

The L-7100 pump can Store

•            9 time programmes, in which mobile phase composition, flow rate and four events can be pro­grammed and varied over a period of time.

•            Via a Link function, programmes for multi-method applications can be linked.

A shut-down routine can be pro­grammed to be carried out at the end of an analysis series by

•            Delayed pump stop and a

•            System flush programme.

Due to minimised internal volume, a highly constant flow-rate and excel­lent gradient reproducibility at low flow-rates, the L-7100 pump is

•            Optimally suited for narrow-bore applications.

For applications involving sensitive materials requiring operation at low temperatures

•            The cold room compatibility of the L-7100 is advantageous.

Premature wear caused by salt­containing eluents is prevented by the fitting of a

•            Piston cleaning facility, whereby the piston wash procedure can be carried out automatically in combination with the LaChrom autosamplers.

GLP Functions

In view of the requirements of qua­lity assurance systems, all modules of the LaChrom system haue been fitted with comprehensive facilities for Status display, reliability monito­ring and the provision of correspon­ding documentation and traceability.

•            All parameters, programmes and gradient curves of the L-7100 pump can be printed out by the LaChrom data systems.

•            The pressure signal of the L-7100 pump is constantly moni­tored as part of the reliability check. Any deviations from the normal pressure profile, caused for example by air bubbles or malfunction of pump valves, are registered during the course of the analysis.

•            The Pump pressure profile can be printed out in the analysis report and hence nerve in the assessment of the quality of the analytical results.

Maintenance is facilitated by the

•            Maintenance logbook which auto­matically registers the total volume delivered. This provides an indica­tion as to when the next replace­ment of the pump seal or the next cleaning of the pump valves should take place.

Controller Function

In stand-alone operation, the system control function of the

L-7100 enables external Instruments to be controlled by providing

•            Four event and other control Signals.

Technical Data

Delivery system             Serien configured double piston pump with electronic compensatio of solvent compressibility and elimination of residual pulsation

Maximum pressure        400 bar

Flow rate                        0.001 –9.999 ml/min

Flow stabiltiy                  ≤ 0,2% RSD

Gradient modes             Quaternary low-pressure gradient, binary or ternary high-pressur gradient

Special functions           Programme link, column pack programme, delayed pump stop, system flush programme

GLP functions                Pump logbook, display of pressure profile deviations, key-board lock

Documentation              Print-out of pump parameters, gradient programmes, gradient curves
pump logbook via LaChrom data systems

Outputs                          4 time-progammable event contacts, analogue pressure signal, busy/ready, D-live

Inputs                             Start, stop, pump on, D-line

Materials                                  Stainless steel, ruby, sapphire, zirconium oxide-ceramic, PTFE, carbon