3
Radio Interference
For compliance with the EMC standards referred to in the EC Declaration of Conformity,
it is necessary that only shielded cables supplied by UNICO
®
are used when connecting
the instrument to computers and accessories.
Introduction
UNICO
®
1200/1201 Spectrophotometers are single beam, general purpose instruments
designed to meet the needs of the conventional laboratory. UNICO
®
1200/1201 is ideal
for various applications, such as: Clinical Chemistry, Biochemistry, Petrochemistry,
Environmental Protection, Food and Beverage Labs, Water and Waste Water Labs, and
other fields of quality control.
Featuring a digital display of photometric result, easy operation, and wavelength range
of 325 nm~1000 nm, UNICO
®
1200/1201 are ideal for measurements in the visible
wavelength region of the electromagnetic spectrum.
Working Principle
The spectrophotometer consists of five parts:
1) Light Source (Halogen 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 and convert the transmitted light to an electrical signal;
5) A Digital Display to show absorbance or transmittance. Figure-1 illustrates the
relationship between these parts.
Light Source Monochromator Sample Compartment Detector Digital Display
Figure-1 Block Diagram for the Spectrophotometer
In the spectrophotometer, light from the Halogen 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 Compartment through one of the filters, which helps to eliminate
unwanted second order radiation from the diffraction grating. Upon leaving the Sample
Compartment, the beam is passed to the silicon photodiode Detector and causes the
Detector to produce an electrical signal that is shown on the Digital Display window.
Specifications
100%T
0 A
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