Operating Principle - J.P. SELECTA UV2005 Manual De Instrucciones

INSTRUCTION MANUAL CODE 80243 REV A
J
.P. SELECTA s.a.
January/11

3 Operating Principle

UV-2005 equipment is composed of five parts:
•
An halogen lamp and a deuterium lamp as light sources.
•
A monochromator to select the wavelength and to eliminate second order radia-
tions.
•
A compartment for sample cuvettes.
•
A photodetector to receive light transmittance and to convert it to electrical sign.
•
A display where absorbance, tramittance and concentration values are shown.
Figure 1
The halogen lamp light (or the deuterium one if we work in a wavelength lower than
340 nm), focus on the monochromator entrance where a collimated mirror points the
light beam towards the diffraction grating.
The diffraction grating diffuses the light beam to produce a spectrum. A part of it
focuses in the monochromator output slot by means of another collimated mirror.
The wavelength light beam selected passes through a filter which helps eliminating
second order radiations of the diffraction grating.
This light beam goes through the sample, and then the photodetector produces an
electrical sign used to make the transmittance or absorbance calculations, shown in
the digital display.
Ctra. NII Km 585.1 Abrera 08630 (Barcelona) España
e-mail: selecta@jpselecta.es - website: http://www.jpselecta.es
(It can be modified without notice)
Tel 34 93 770 08 77 Fax 34 93 770 23 62
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