Aqua Sensor (Optional) - Bosch SRU53E05AU Repair Instructions

4.3

Aqua sensor (optional)

A Photodiode
B Infrared diode
The infrared light-emitting diode (B) and the photodiode (A) are loca-
ted opposite each other in a U-shaped translucent housing on a
board.
The infrared light-emitting diode (B) transmits infrared light through the
detergent solution flowing between the U-shaped housing. Depending
on the turbidity, the light-sensitive base of the photodiode becomes
conductive.
The measurement is analysed in turbidity ranges. The Aqua sensor
is active:
► in the prerinse cycle -> decision on water change before washing
► in the wash cycle -> washing temperature and rewash time
depending on turbidity range (6 turbidity ranges)
► at the end of the wash cycle via the type and number of
intermediate rinse cycles (3 turbidity ranges)
815_58300000120057_ara_en_d.doc – 25.05.11
C Detergent solution
48 programme structures are possible in the automatic programme.
In each programme sequence in which the Aqua sensor is active the
sensor is also calbrated.
If the calibration is defective, a fault is written to the fault memory of
the module, the measurement is set to turbid and a maximum pro-
gramme sequence occurs.
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