Turbidity Sensor And Thermistor - Haier GE DDT700S N0 Series Technical Service Manual

Turbidity Sensor and Thermistor

Operation
The Turbidity Sensor measures the amount of
suspended particles in the filtered wash water.
The Thermistor is also located within the turbidity
sensor. The sensor assembly contains a LED
transmitter which emits light and a receptor
(similar to a photo-cell) which receives light. The
wash water passes between the transmitter and
receptor, the control interprets these readings
to determine the soil level and if any prewash or
rinse cycles may be skipped. The cycle design
sets parameters to a maximum cycle length; and
the turbidity response will shorten the overall
cycle length if the soil level is below the cycle
preset specifications. By measuring several
times during a cycle to monitor soil levels, energy
can be saved by removing unneeded rinses, thus
shortening the overall cycle time.
If the turbidity sensor fails open or shorted, the
control will default to the maximum fills and
circulation time that the control is programmed for.
Turbidity Sensor Removal
1. Turn the sensor counter-clockwise.
2. Pull the sensor out of the sump.
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