GF47.20-P-2105IC Component Description For Fuel Filter Water Level Sensor

GF47.20-P-2105IC Component Description For Fuel Filter Water Level Sensor
- ENGINE 648.961 in MODEL 211.026 with CODE (494) USA version





Location
70 Fuel filter
B76 Fuel filter water level sensor

The water level sensor is inserted from above in the fuel filter.

Task
The water level sensor detects the water level in the fuel filter.





Design
70 Fuel filter
76/1 Electrode 1
76/2 Electrode 2
76/3 Integrated electronics
76/4 Connection (to water suction)
B76 Fuel filter water level sensor

Function
The water level sensor determines the electrical resistance between electrode 1 and electrode 2.
If the fuel lies between the electrodes, the water level sensor does not send an output signal. If the water level in the fuel filter rises up to the electrodes, the electrical resistance between the electrodes drops. The drop in electrical resistance is detected by the integral electronics and sent to the CDI control unit (N3/9) in the form of a voltage signal.

If the water level rises in fuel filter the CDI control unit transmits a message to the instrument cluster (A1) via the CAN data bus.

In order to avoid electrolysis (corrosion of the electrodes), the measurement of an ac voltage is used.