GV 640 Service Manual 69
For internal use only
7.4.5 Dispensing assistant
The dispensing assistant is made up of interaction between the arrangement of the dispenser and the
moulded handle in the top basket.
The dispenser is in the middle of the door on the
top surface.
The moulded handle of the tab drawer is located
on the top basket. The tab falls into the mould. The
top basket spray arm sprays this direct from the
bottom so that the tab dissolves.
The bottom basket can no longer be pulled over
the dispenser when it is pulled out. Scraps of food
can no longer fall into the detergent dispenser and
block it.
1 Top basket
2 Moulded handle
3 Dispenser
4 Top basket spray arm
7.5 Aqua sensor (optional)
Caution
No aqua sensor installed!
Some of the dishwashers are supplied without an aqua sensor. The electronics
unit nevertheless checks for an aqua sensor and stores an error message.
An infrared diode and a photo diode are arranged opposite in a U-shaped transparent casing on a circuit
board.
The infrared diode transmits its infrared light through the rinse water flowing in the U-shaped casing. De-
pending on the level of clouding, the light-sensitive basis of the photo diode becomes conductive.
Readings are analysed by turbidity levels. They are stored in the electronics unit. The aqua sensor op-
erates in the pre-rinse and rinsing cycles and at the end of the rinsing cycle. The result of the aqua sensor
analysis influences the procedure of rinsing cycles and water-exchange intervals.
A wide variety of programme structures are possible in the automatic programme.
The aqua sensor is calibrated during each programme sequence in which it is active. If calibration is de-
fective, an error is written in the error memory of the power electronic module. The reading is adjusted
to “turbid” and a maximum programme sequence is run.
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