Product description Turbimax CUS51D
8 Endress+Hauser
3 Product description
3.1 Product design
The sensor is designed for continuous in-situ determination of turbidity and solids content.
The sensor with the 40 mm (1.57 in) diameter can be operated directly and completely in
the process without the need for further sampling (in-situ).
The sensor includes all necessary modules:
• Power supply
• Light sources
• Detectors
Detectors detect the measuring signals, digitize them and process them to form a
measured value.
• Sensor microcontroller
This is responsible for controlling internal processes and transmitting data.
All data - including the calibration data - are stored in the sensor. The sensor can be
precalibrated and used at a measuring point, calibrated externally, or used for several
measuring points with different calibrations.
3.1.1 Measuring principle
For turbidity measurement a light beam is directed through the medium and is deflected
from its original direction by optically denser particles, e.g. particles of solid matter. This
process is also called scattering.
A0030850
1 Deflection of light
1 Light source
2 Light beam
3 Particle
4 Scattered light
The incident light is scattered in many directions, i.e. at different angles to the direction of
propagation. 2 angle ranges are of particular interest here:
• Light scattered at a 90° angle is used primarily for turbidity measurement in drinking
water.
• Light scattered at a 135° angle extends the dynamic range for high particle densities.
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