Design and function
2017-05-22 / DIS 113_58300000186503_ara_en_c
Copyright by BSH Hausgeräte GmbH
Page 11 of 85
3.4
Turbidity sensor
3.4.1
Structure
Fig. 4:
Components of the turbidity sensor
1
Seal
3
Circuit board with light barrier
2
Housing
The turbidity sensor consists of a circuit board (3) on which there is a light barrier.
The board is situated in a transparent housing (2) surrounded by a seal (1). The
housing protrudes into the outer tub.
3.4.2
Function
The turbidity sensor operates according to the principle of a
. The water fills the space between the light-emitting diode and
phototransistor of the light barrier. The turbidity of the water determines the signal
strength on the phototransistor.
Fig. 5:
Function of the turbidity sensor
1
Water
3
PCB
2
Light barrier
The turbidity sensor detects the turbidity of the water in the following programme
steps:
•
Prewash
•
Rinse
The measured turbidity provides information about the degree of soiling and sud
content in the water.
The measurement result influences the further operation of the wash programme:
•
Changing the water for the main wash
•
Addition of extra rinse cycles (max. 4 additional rinse cycles possible)
•
Reduction of spin speed for reduced formation of suds
The turbidity sensor must be