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03.2004 R.K. 599 519 400 EN
4.6 NTC-Temperature sensor with
integrated turbidity sensor
NTC
Turbidity sensor
The turbidity sensor function is only activated in cycles AUTO
Function:
The input voltage with the turbidity sensor may be between 6 V and 11.4
V. (The measurements are described in detail in the chapter Measuring
Points at the Electronic Control (in the base)). For a clear water the output
voltage must always be 4.3 V. If that value differs due to soiling of the
turbidity sensor after a longer operational period, the Easytronic plus
recontrols the input voltage with the turbidity sensor automatically until the
output voltage is 4.3 V. This happens during the final rinse cycle.
If the 4.3 V is not achieved within 8 seconds, the fault C5 is stored in the
fault memory. If the output voltage falls below 3 V in the prewash cycle and
below 3.8 V in the intermediate rinsing cycle, turbid water will be detected.
With the service test routine the turbidity sensor will be calibrated to 3.5
V not with water but with air.
That corresponds to 4.3 V with water.
4,3V
output voltage intermediate
turbit water
4,3V3V
output voltage prewash
turbit water clear water
3,8V
clear water
Temp. Resistance
10°C 9653 Ohm
25°C 4843 Ohm
60°C 1204 Ohm
90°C 445 Ohm
NTC
4.8 Interference Filter
The interference filter is connected in the terminal board parallel
to the mains feed.
The NTC with trouble sensor is installed in the sump.
Reed switch
Permanent magnet
4.7 Filter detection (SL)
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