Electrolux DIVA 60 - Automatic Cycle; Turbidity Sensor; Calculating the Degree of Soiling; Determination of the Load

SOI/DT 2003 - 01 eb 26 599 35 63-72
8 Automatic cycle
8.1 Turbidity sensor
Certain models which feature the turbidity sensor may also feature a special
“automatic” programme which optimizes the cycle according to the size of the load
and the degree of soiling. This sensor is positioned externally to the sump, in direct
contact with the water.
A single container houses the NTC sensor (for control of the washing temperature)
and the infra-red opto-electronic sensor, which controls the turbidity of the water and
therefore the degree of soiling that it contains.
8.1.1 Calculating the degree of soiling
Measurement of the level of turbidity is
performed during the cold pre-wash. The
photoemitting diode, which is powered by the
circuit board (connector G7), transmits a beam
of light to the photoreceiver. The circuit of the
photoreceiver (connector G8 on the circuit
board - G6 is the common contact) is traversed
by a certain current whose intensity is
proportional to the quantity of light received (i.e.
inversely proportional to the level of turbidity).
The microprocessor measures the signal
present in the circuit, and can thus determine
the most appropriate cycle according to the
quantity of soiling present in the water.
8.1.2 Determination of the load
The quantity of dishes in the load (full load or 1/2
load) is determined during the initial heating
phase during washing by controlling the rate at
which the temperature of the water increases
(NTC sensor, connector G5).
 Full load: when the inclination of the curve is
below a certain threshold which is memorized
as standard.
 Half load: when the inclination of the curve is
above the standard threshold.
8.2 Automatic Programme
The table below shows the variations in the programme phases according to the type of soiling and the size
of the load.
Type Programme phases
Load
Heavy
soil
Pre-wash Wash First rinse Second rinse Hot rinse Drying
Full Yes 68º C Cold
Full No 55º C
Half Yes 55º C
Half No
Cold
50º C
Cold
no
68º C 24 min.
temperature
time
threshold
1/2 load
full load