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Spectrophotometer

Model: HO-ED-TH-01

Holmarc's Spectrophotometer (Model No: HOED- TH-01) is ideal for education, research and industrial applications. Unlike other entry level spectrophotometers, it employs the classic Czerny - Turner monochromator design, 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 graphic LCD screen is used to plot an absorbance v/s wavelength graph. The data can then be analyzed for peaks and valleys.

The spectrophotometer can measure the amount of absorbance or lack of absorbance of different colored light for a given molecule. The absorbance spectrum is a graph of a sample's absorbance at different wavelengths.



Experiment Examples

    To study the absorbance and transmittance of different samples at different wavelengths

Shafi



    To plot the graph of absorbance Vs. wave length

Shafi



Specification


Wavelength

    Range   :   380 - 1100 nm

    Resolution   :   1 nm

    Accuracy   :   ± 1 nm

    Bandwidth   :   2 nm


Concentration

    Range   :   0 to 999

    Selectable resolution   :   1,0.1,0.01 or 0.001

    Readout   :   320 x 240 Pixels graphics LCD

    PC Interface   :   RS232 (optional)

    Light source   :   Tungsten halogen lamp 20 W


Transmittance

    Range   :   0 to 100%

    Resolution   :   0.1%

    Accuracy   :   ± 1%

    Noise levels   :   < 1%

    Stability   :   ± 1% / Hr after warm-up


Absorbance

    Range   :   0 to 2 A

    Resolution   :   0.001 A

Features

    Compact and easy to use

    LCD display is large enough to read from any distance

    Selectable resolutions

In a spectrophotometer, the amount of light passing through the sample cell is measured by a photometer. The photometer delivers a voltage signal to a processing unit. The signal changes as 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.

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