Turbidity Sensor (Eco Sensor); Electronic - Power Outputs; Figure 4-21: Turbidity Sensor (Eco Sensor) - Miele G 600 Series Technical Information

G 600/G 800
4.24

Turbidity Sensor (ECO Sensor)

Certain models of dishwashers are equipped with a turbidity (ECO) sensor. The
sensor is comprised of a phototransistor that emits a beam of light through the water
path. On the opposite side of the sensor is a photoelectric switch (receiver). The
amount of light capable of passing through the water is based on the turbidity
(transparency) of the water. The amount of light received affects the current flow of
the sensor and is used by the electronic to calculate the condition of the water.
If clean water is present, the light flow is near 100%. As the water becomes dirty, the
amount of light received is reduced.
During certain program steps (refer to the model-specific timing chart), the sensor is
monitored to determine the condition of the water.
Example:
At the end of the pre-wash, the water is checked via the turbidity sensor. If the water
is clean enough, the program will change by eliminating the drain at the end of the
pre-wash and the fill at the beginning of the main wash. The same water will
continue to be used to reduce water consumption.
If the turbidity sensor and electronic determine the water to be "dirty", then the
program will continue with a drain at the end of the pre-wash, and a fill during the
main wash.

Figure 4-21: Turbidity Sensor (ECO Sensor)

The sensor is located within the plumbing connection between the circulation pump
and top spray arm. In order to compensate for residues on the sensor and ageing of
the optical system, the turbidity sensor is re-calibrated automatically every time the
dishwasher runs a program (the steps on the timing chart are marked with a "T"). To
prevent residues from drying on the sensor surface, the sensor remains in water
after the drainage cycle.
4.25 Electronic – Power Outputs
The electronic controls all components within the dishwasher. The activation of
components requiring 120VAC power is handled by thyristors and relays within the
electronic. The individual components of the electronic are not replaceable. If a
component on the electronic requires replacement, the electronic must be replaced
as an assembly.
Technical Information
2 Photoelectric switch line
3 Phototransistor line
4 5V
45