Monochromatic light from the filter is directed to an optical fiber. The light from the
monochromator to the flow cell and from the cell to the detector electronics is guided
by optical fibers which focus its full intensity on the liquid flow path, maximizing the
sensitivity of the monitoring. Before entering the flow cell, the monochromatic light is
split in a beam splitter, with 50% of the light passing through the sample fiber (S) and
the flow cell, and 50% being directed through the reference fiber (R). Two photodiodes
with identical characteristics monitor the intensities of the measuring and reference
beams.
R
S
1
2
3
4
5
6
7
8
9
Function
Part
Flash lamp 100 Hz
1
Filter unit
2
Beam
3
22
Monitor UVis-920 Operating Instructions 29055049 AD
3 System description
3.2 Monitor principle
