Varian ProStar 325 UV-Vis, Руководство по обслуживанию

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ProStar325 Service Manual
98
Publication date 8 May 2003
Top view of optics module
Grating details
Grating size: 35mm x 30mm x 6mm
Blaze angle: 8.5°(UV)
Blaze wavelength: 250nm (UV-Vis)
Lines per mm: 1200 lines/mm (UV-Vis)
5.2.4 Optical path
Light coming from either source lamp is passed through a
focusing lens before hitting the beam splitter. The sample path
consists of mirror N1 and the reference path consists of mirrors
N2 & N3.
The two beams then pass through an entrance mask which
shapes the beam to the geometry required before entering the
flowcell. Upon leaving the flowcell they again pass through a
mask before entering the monochromator. This mask helps
determine the resolution of the detector optics.
In the monochromator, the light is directed onto the entry
collimating mirror and then onto the grating. The dispersed light
then hits the exit collimating mirror before leaving the
monochromator through the exit mask. From here the beams are
passed onto the dual photo-diode detectors.
Exit and entrance masks
The masks used throughout the optical system, determine the
optical resolution of the detector. They have a nominal spectral
bandwidth of 6nm.
Beam splitter
The beam splitter is a silica plate which divides the beam into
50% sample light and 50% reference light.
Flowcell assembly
The function of the flowcell is to direct light from the lamp
sources through a sample/solvent flow path and then into the
monochromator. Focusing is achieved by quartz optics lenses
fitted to the flowcell. The body of the flowcell is made from
titanium and has a working pressure range of approximately
1000psi.
The flowcell is designed for removal, installation and replacement
by the user. Instructions for the removal and replacement are
given in the Installation section of this manual.
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