Firma:              Metrohm

Modell:            485

Kommentar:    Dokumente dt.

Metrohm Kolbenbüretten sind längst zu einem Begriff geworden und gehören zur Standardausrüstung eines analytischen Laboratoriums. Neben der einfachen Handbürette E 274, die in unzähligen Laboratorien weiteste Verbreitung gefunden hat, sind unter Verwendung der gleichen Konstruktionsmerk­male Ausführungen mit Motorantrieb entstanden, zuletzt die Digital-Bürette MULTI-DOSIMAT E 415. Das hier zur Anwendung gelangende System des durch einfachen Handgriff auswechselbaren Bürettenteils, umfassend Zylinder mit Teflonkolben, Vorratsgefäss, Bürettenspitze und der Schlauch- oder Kugelschliff-Glasverbindungen, bietet zusätzliche Vorteile. Diese Wechseleinheiten erfreuen sich grosser Beliebtheit, ermöglichen sie doch, die gebräuchlichsten Titriermittel stets einsatzbereit in Nähe des Titrierstandes

zu halten und in Sekundenschnelle einen Wechsel vor-zunehmen. Die gleichen Wechseleinheiten gehören auch zur Ausrüstung der METROHM-Titrierautomaten "Potentiograph" und "Combi-Titrator". Sie sind daher

in vielen analytischen Laboratorien zahlreich vorhanden, und es besteht der Wunsch, davon auch für einfache Arbeiten, bei denen eine Handbürette genügt, Gebrauch machen zu können. Die MULTI-BURETTE E 485 kommt diesem Bedarfsfall gleichermassen entgegen wie sie geeignet ist, die Vorzüge des raschen Titriermittel-Wechsels mittels Wechseleinheiten einem weiteren Benutzerkreis zugänglich zu machen. Sie kann als einzelne Handbürette verwendet werden, oder in gleicher Weise wie die Motor-Kolbenbürette zu Titrierständen ergänzt werden (E 486).

Zum Antrieb des Kolbens der Wechseleinheit ist im Gehäuse die bewährte Mechanik der Hand-Kolbenbüretten eingebaut. Dosiert wird durch Drehen der Trommel, gefüllt durch Niederdrücken des roten Hebels. Das Resultat wird an Grobskala und Trommel abgelesen. Die Skala, für 10 ml-Büretten ausgelegt, zeigt 1 Teilstrich für 0,01 ml. Für Büretten mit einem Inhalt von 5 oder 20 ml ist die Ablesung mit dem Faktor 2 entsprechend zu berichtigen.

Technische Daten

Skalenbereich                0...10 oder 0...20 ml

Skalenteilung                 0,01 oder 0,02 ml (1%)

                                      (für abweichendes Volumen umrechnen)

Wechseleinheiten          5, 10, 20 ml Zylindervolumen

Dimensionen                 Breite 150, Höhe (inkl. E 414) 470, Tiefe 160 mm

Masse                            2,1 kg (inkl. Normalzubehör)

Chrompack Fluorescence Detector

General Description

The Chrompack fluorescence detector is a high performance fluorescence detector designed to provide the high sensitivity required for HPLC fluorescence analysis, and as such it incorporates the following features:

Optical design for greater sensitivity

1.     The highly energy-efficient optics uses no lenses and thus avoids the problem of reflection loss and chromatic aberration.

2.     Simple optics using holographic, concave diffraction gratings and aspherical mirrors provide highly efficient monochromators in a compact package.

3.     Use of a 150 W xenon lamp provides greater light energy for excitation.

4.     Slit width of the Ein monochromator may be changed in two steps (normal, 18 nm, or wide, 30 nm, spectral band width) via front panel key pad, allowing to select the most suitable band width for the analysis.

Microprocessor control for greater versatility and reliability

5.     The wavelength is set using increment/decrement keys and an LCD multi-display; this facilitates setting the correct parameters thus increasing the reliability of measurement.

6.     Operating status and the results of self-diagnostics are displayed as messages an the LCD multi-display.

7.     Digital processing is used, not merely for control, but throughout the entire signal processing system, assuring higher reliability and operational stability.

8.     Equipped with a microprocessor-controlled auto-zero system which provides a wide range of base settings.

9.     Excitation and emission wavelengths, Gain, Attenuation may be changed in five steps according to a time program, allowing optimum conditions to be set automatically for each peak component.

SPECIFICATIONS

Chrompack Fluorescence Detector

Optical system

Monochrometer                                Holographic concave diffraction grating (for both       excitation and emission)

Light source                                      150 W xenon lamp

Wavelength range                            220 nm - 700 nm (excitation and emission)

Spectral band width                          Excitation: 18 nm (fixed); emission: 18 nm, 30 nm    (selectable)

Wavelength accuracy                       ± 5 nm

Wavelength reproducibility               ± 0.3 nm

Detectors                                          Photo-multiplier, reference: photodiode

Control system

Detector sensitivity                           Raman peak S/N ? 120 for water (with 350 nm excitation     wavelength and time constant of 1.5 sec)

Sensitivity attenuation range             1, 2, 4, 8, 16, 32, 64, 128 and Short

Amplifier range                                  x 1000, x 100, x 10, x 1

Response                                         Fast (0.1 sec), standard (1.5 sec) and slow (3.5 sec)

Signal processing                             Digital processing using A/D and D/A convertors

Outputs                                             Recorder output - 10 mV/FS; integrator output - 1 V/FS or    0.5 V/FS; marker output and leak output

Inputs                                                Marker input and auto-zero input; program reset/run input

Program functions                            Ex and Em wavelengths, gain, attenuation is controlled by   the time program in five steps (including the initial          conditions); program time is up to 999.9 minutes (in 0.1       min increments).

Ex sweep function                            Allows automatic scanning of the Ex wavelength for Ex        spectra output.

Em sweep function                           : Allows automatic scanning of the Em wavelength for Em   spectra output.

Self-diagnostic functions                  Memory (ROM, RAM), DC power supply, Ex energy             reduction, cell leakage

Integration lamp operation time        Integrated Xe lamp operation time is displayed on the           LCD.

Polarity change function:                  Recorder output polarity may be changed alternately via      front keyboard.

Other

Liquid wetted materials                     Quartz, fluorocarbon resin or stainless steel

Dimensions and weight                    210W x 225H x 470D; approx. 12 kg

Power requirement                           110, 220 or 240 V AC, 50/60 Hz 350 W maximum

UV/VAR Detector

The Linear Instruments UVIS 204 is an ultraviolet/visible absorbance detector for liquid chromatography. The unit combines ease of use wtth flexibility and power unmatched by any other detector in its class.

Specifications

Wavelength:                            190-800 nm

Bandwldth:                              6 nm

Wavelength Accuracy:            + or - 1 nm

Wavelength Precision:            + or - 0.1 nm

Optical Methodology:               Deuterium (190-365 nm) and tungsten (366-800) lamp light          sources with concave holographic grating monochromator and   double beam optics, provision for purging the monochromator

Range Selectlons:                   0.0005 to 7.9995 AUFS, in 0.0005 AU increments on any of the     chart recorder outputs

Absorbance Ratio:                  Displayed as ratio of absorbances (at the two selected      wavelengths) per full scale range; plotted as log of ratio of          absorbances per full scale range

Recorder Outputs:                  IOmV, 100mV, or 1V output in any combination on the four            recorder outputs

Integrator Output:                    1V per AU, Selectable for base or delta wavelength, auto zero       capability

Remote Controls:                    Rear panel input for auto zero of the chart recorder outputs.          Rear panel input for event mark. RS-232C serial interface for     computer control and/or data acquisition. DPDT relay closure       for optional stop flow valve control and/or peak detection driven          fraction collector. Chart recorder control.

Noise:                                      <2 x 10 ^-5 AU from 220-280 nm with 1.0 sec rise time. Single         wavelength operation.

                                               <5 X10 ^-5 AU from 220-280 nm with 1.0 sec rise time. Dual            wavelength operation.

Drift:                                         <2 x 10 ^-4 AU/hr alter warm-up

Zero Adjust:                             Plus or minus any amount by autozero or by manual entry

Chart Recorder Filter:             Digital active fifter with rise times selectable from 0.0 to 9.9 sec    (divide by 2 to convert to an equivalent time constant)

Flow Cells:                              Pathlengths from 10 mm to 0.0 mm, cell volumes from 0 to 15     microliters, stainless steel or Kel-FTM• contact materials,             sapphire windows; 1000 psi pressure rating for stainless steel      cells, 500 psi pressure rating for Kel-FTM cells, 2000 psi             pressure rating for variable pathlength preparative cell;                                                microbore cells available.

Programmabililty:

• 256K of chromatogram and spectra storage

• take spectra at any scheduled time

• change wavelength at any scheduled time

• store spectra and chromatograms

• "playback" stored data at any range, rise time, or rate an any recorder channel

• store four complete programs in nonvolatile memories