YSI NiCaVis 701 IQ NI - Manual (Page 7)

NiCaVis 70x IQ NI
Overview
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1.4 Structure of the UV sensor
A UV sensor contains a light source (1), a measuring gap (3) to enable
the contact of light with the measuring solution, and a detector (5) to
measure the attenuated light beam.
The sender of the optical system (2) directs a light beam, the measuring
beam (6), through the measuring solution and a second light beam, the
reference beam (8), over a distance without measuring solution. The
test sample is between both measurement windows (3) in the
measuring gap.
The receiver of the optical system (4) directs the measuring beam and
reference beam to the detector. In the detector, the light is received by
fixed photo diodes.
Fig. 1-2 Structure of a UV sensor
1 Light source
2 Sender of the optical system
3 Measuring gap between the measurement windows
4 Receiver of the optical system
5 Detector
6 Measuring beam
7 Reference beam
8 Connection for the optional compressed air cleaning system
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6
3 4
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2 1 5