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Spectrophotometer


Model: HO-SP-3480 & HO-SP-1911
High wave length resolution
Employs Czerny - Turner monochromator

Holmarc’s HO-SP-3480 & HO-SP-1911 are entry level spectrophotometers suitable for education, research and industrial applications. Unlike other entry level spectrophotometers, it employs classic Czerny - Turner monochromator design, normally available only with advanced models, which ensures low stray light. It uses 1200 lines/mm blazed holographic grating as the dispersion element providing high wavelength resolution. It also employs a sigma delta ADC of 16 bit resolution for photometric measurements, a resolution higher than most of the spectrophotometers available in this price range. A graphics LCD screen is used to plot an absorbance v/s wavelength graph. The data can then be analyzed for peaks and valleys.

Customized accessories are available to address individual application requirements. In a spectrophotometer, the amount of light passing through the sample cell is measured by a photometer. The photometer delivers a voltage signal to the processing unit. The signal changes with the amount of light absorbed by the liquid changes. According to Beer's law, the amount of light absorbed by a medium is proportional to the concentration of the absorbing material or solute present. Thus the concentration of a colored solute in a solution can be determined in the lab by measuring the absorbance of light at a given wavelength.




    Wavelength
    Range :     380 to 1100nm (Model : HO-SP-3480)
        190 to 1100nm (Model : HO-SP-1911)
    Resolution :     1 nm
    Accuracy :     ± 1 nm
    Spectral bandwidth :     2 nm
    Transmittance
    Range :     0 to 100 %
    Resolution :     0.1 %
    Accuracy :     ± 1 %
    Noise Level :     < 1 %
    Stability :     1% / Hr after warm-up
    Absorbance
    Range :     0 to 2 A
    Resolution :     0.001 A
    Concentration
    Range :     0 to 999
    Selectable resolution 1, 0.1, 0.01 or 0.001
    Calibration with 1 or 2 known standards
    Direct factor entry
    10 method memory
    Readout :     320 x 240 Pixel Graphics LCD
    PC Interface :     RS232 (Optional)
    Light Source :     Tungsten Halogen Lamp 20W
    Spectrum
    Any range between 380 and 1100nm
    Selectable scan wavelength interval of 1 to 50nm
    Live absorbance plot during scanning
    Plot browser to read absorbance values at each wavelength
    Analyzer to find out absorbance and wavelength of peaks and valleys
    Input Voltage :     230V 50Hz
    Input Power :     < 50 W
    Size :     530 (w) x 330 (d) x 175 (h) mm
    Weight :     27Kgs (Approx)

Fig. Optical Layout of Spectra HO-SP-3480 Spectrophotometer



Scanning Mode Features

    Wavelength range between 380 and 1100nm

    Selectable scan wavelength interval 1 to 50nm

    Live absorbance plot during scanning

    Plot browser to read absorbance values at each wavelength

    Analyzer to find out absorbance and wavelength of peaks and valleys


Customized accessories are available to address individual application requirements. Model HO-SP-3480 comes with 10 mm path length cuvettes. Cuvettes of smaller path lengths are available as optional accessory.


For most (99%) absorbance measurements 10 mm pathlength cuvettes are suitable. Cuvettes of shorter pathlengths allow the measurement of concentrated samples without dilution.


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