Unico S-2150 Series, Руководство пользователя

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4
Performance
To ensure that the instrument is working within its specification, especially when making
measurements of an important nature, carry out performance checks with particular reference to
wavelength and absorbance accuracy. Performance checks are detailed in this manual.
Radio Interference
For compliance with the EMC standards referred to in the EC Declaration of Conformity, it is
necessary that only shielded cables are used when connecting the instrument to computers and
accessories.
Introduction
The UNICO S-2150 series are single beam, general purpose instruments designed to meet the
needs of the Conventional Laboratory, They are ideal for various applications, such as: Clinical
Chemistry, Biochemistry, Petro-chemistry, Environmental Protection, Food and Beverage Labs,
Water and Waste Water Labs and other fields of quality control and research.
Both S2150 Series features a digital display of photometric result, easy operation and
wavelength range of 325nm to 1000nm for S-2150 and 200nm to 1000nm for model S-2100UV.
S-2150 is ideal for measurements in the visible wavelength region of the electromagnetic
spectrum and S-2150UV in ultraviolet and visible wavelength region.
Working Principle
The spectrophotometer consists of five parts: 1) Halogen and deuterium (for S-2150UV only)
lamp to supply the light; 2) A Monochromator to isolate the wavelength of interest and eliminate
the unwanted second order radiation; 3) A sample compartment to accommodate the sample
solution; 4) A detector to receive the transmitted light and convert it to an electrical signal; and
5) A digital display to indicate absorbance or transmittance. The block diagram below illustrates
the relationship between these parts.
Block diagram for the Spectrophotometer
In your spectrophotometer, light from the lamp is focused on the entrance slit of the
monochromator where the collimating mirror directs the beam onto the grating. The grating
disperses the light beam to produce the spectrum, a portion of which is focused on the exit slit of
the monochromator by a collimating mirror. From here the beam is passed to a sample