Endress+Hauser Turbimax CUS51D - Page 9

Turbimax CUS51D Product description
Endress+Hauser 9
90°
135°
1
2
3
A0030846
 2 Principle mode of operation of turbidity sensor
1 Light source
2 135° light receiver
3 90° light receiver
If the particle density in the medium is low, most of the light is scattered in the 90°channel
and a small amount of light is scattered in the 135° channel. As the particle density
increases, this ratio shifts (more light in the 135° channel, less light in the 90° channel).
1
Ir
FNU
90°
135°
A0030849
 3 Signal distribution as a function of the particle density
Ir Relative intensity
FNU Turbidity unit
The CUS51D turbidity sensor has 2 sensor units, which are independent of each other and
arranged in parallel. The application-dependent evaluation of both signals leads to stable
measured values.