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12 Product description
12.1 NIR sensor STS 03/04
7 Housing cover
8 Display and control display
9 Electrical connection M12
connector
10 Pressure screw
11 Process connection
12 Measuring window
NIR sensor
The NIR sensor STS 03 / 04 is a 180° see-through sensor
measuring absorption or opacity in fluids in the near infrared
range (880nm wavelength).
In liquid media, a collimated light beam is damped by absorption
and scattering. This damping can be measured in the event of a
defined optical path length (transmission path) and, thus,
conclusions can be drawn regarding the rayed medium, because
the absorption of a fluid is directly proportional to its
concentration, which is described by the Lambert-Beer law. The
underlying measuring unit of absorption is AU (absorption units).
One AU corresponds to a light loss of 90%, 2 AU correspond to
99%, 3 AU correspond to 99.9% and so on.
Opacity is an optical impression describing the property of
intransparent media regarding the damping of light. Opacity is not
an unambiguously defined or physical quantity, but a subjective
impression. In order to improve the comparability, opacity
measurements were calibrated using so-called reference standards
(e.g. formazine). Nevertheless, the displayed measured values of
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