U-1900 Ratio Beam Spectrophotometer

Basic model configured by condensing a great variety of measurement functions into a compact and simple-to-operate design. Spectrophotometer U-1900 answering a broad range of measurement needs. Measured data excellent in accuracy and reliability is assured by stable basic performance.

Topic : Basic course of UV-Vis "6. Structure of a spectrophotometer" The 6th explains a rough structure of "Differences between a man and a spectrophotometer" on the basis of heretofore described.

Features  Example of application  Specifications  Options  Applications    Basic course of UV-Visible/NIR Spectrophotometer  Contact Us

Features

Adoption of ratio beam optics Ratio beam is a scheme in which part of the beam is branched with a half mirror and its light quantity is detected with a detector to obtain a signal reference. Thanks to the ratio beam scheme, an energy change in the light source, a temporal change of optical elements, etc. can be compensated. Therefore, highly stable photometric values are obtainable. This always ensures reliable results even in long-time measurement. Incorporation of stigmatic concave diffraction grating The optics of this instrument adopts the Seya-Namioka monochromator widespread as a representative concave diffraction grating monochromator. Because a concave diffraction grating has both beam condensing and dispersing functions, an optical system can be configured with fewer mirrors. In a spectrophotometer, use of fewer mirrors signifies a shorter optical path, thus giving rise to an aberration-free bright optics. For elimination of the aberrations which were essentially unavoidable in the past, a stigmatic concave diffraction grating has been developed by applying Hitachi’s original technology. As a result, a higher resolution has been realized. Large LCD and user-friendly keypad Display characters are larger than those of the preceding instrument (U-1800). Spectrum and working curve are easier to see. In addition, a keypad featuring an easy-to-use key layout has been employed, so condition setting and measurement can be completed with the briefest possible key operation. Measurement methods savable A maximum of 5 measurement methods can be saved. This ensures exact and easy re-measurement. *: Because selection is allowed among plural methods, an analyst’s burden can be reduced and necessary time can be shortened substantially. Personal computer-based instrumentcontrol and data processing High-level data processing can be carried out by controlling the ModelU-1900 from a PC when the optional UV Solutions program is installed. Also, report generation will be supported through data pasting, transfer,etc. to another application program. For connection with a PC, an RS-232C communication cable isrequired.

Example of application

Quantitation of hexavalent chromium An example of quantitative analysis of hexavalent chromium by diphenylcarbazide absorptiometry is introduced here. As a result of creating a working curve within 0 to 0.8μg/mL, a correlation coefficient of 0.9999 was obtained, proving an excellent calibration relationship. Measuring wavelength: 540nm Concentration of standard solution: 0, 0.04, 0.1, 0.2, 0.5, 0.8μg/mL Reference: Raw data Conc 0.0 0.04 0.1 0.2 0.5 0.8 Abs 0.000 0.031 0.081 0.162 0.408 0.646

Specifications

Item U-1900 Optics Seya-Namioka mount monochromator, ratio beam Wavelength range 190 to 1,100nm Spectral bandpass 4nm Display LCD with backlight (12.2cm) Printer I/F Centronics interface Serial I/F RS-232C (exclusive for UV Solutions program) Size (main unit) 380 (W) × 643 (D) × 311 (H) mm Weight (main unit) About 27kg Power supply 100, 115, 220, 230 or 240V, 50/60Hz Power consumption 300VA

Options

UV Solutions program (P/N 2J1-0310) The UV Solutions program enables a PC to control the U-1900.When this program is installed, the following programs are usable. (A Windows®XP compatible PC needs to be prepared separately.) Option package program (P/N 2J1-0311) Capable of performing color calculation and color difference calculation. Nucleic acid measurement program (P/N 2J1-0316) Usable for checking extraction and refinement of nucleic acids such as DNA/RNA essential for genetic research. Data (photometric values at 230, 260 and 280nm), and calculation results (260/280, nucleic acid concentration, protein concentration, molar concentration) can be displayed collectively on the screen. GLP/GMP program (P/N 2J1-0317) The burden of optical instrument performance check can be alleviated. Item-dependent measurement mode and automatic measurement mode (when no sample is necessary) have also been prepared. In addition, a judgment tolerance range is settable so as to meet each analytical purpose. Report generator program (P/N 2J1-0312) Developed to enable freely customizing the report output format of measurement results. Each character size and position of report items and comment are settable and besides, mathematical calculations conventionally dependent on manual method can be executed by spreadsheet program functions. UV Navigation program (P/N 2J1-0313) Provides support for automation of measurement, data processing and printout. Measuring procedure can be readily programmed using a graphical editor for implementation of spectrophotometer control, measurement result indication and judgment, etc. Because analytical procedure can be automated, it is possible to save labor and form working patterns. This is effective for routine work such as quality control.