Water Level Sensor & Cleaning - Swift Motorhome Owners Service Manual

WATER L EVEL SEN S OR & C LE A N IN G
Water level sensor & cleaning
Principle
The sensor, fitted to Swift Group motorhomes
are pre-fitted to water tanks, and link to the
control unit, via a pre-fitted wiring harness.
The sensors, which consist of a number of
stainless steel rods or probes, at different
lengths, are immersed in the fresh or waste
water, and use the conductivity of water,
between the probes, to provide a reading to
the control unit.
The sensors are 'digital', in that while the
conductivity (resistance) value can vary, the
fusebox will register any conductivity between
the reference probe and the various different
length probes, indicating water present.
Normally, even if the rods are dirty, and
providing the rods have not bridged by a
foreign object, a circuit will still be delivered
back to the control unit and a water level
displayed.
Sensor cleaning
The first step, in case of fault diagnosis, is
to clean the sensor rods. False water level
readings at the control unit can be caused
by calcium build-up or foreign objects within
the tank bridging the probes. (Especially with
waste tanks).
To clean sensor:
!
WARNING: Only use food safe plastic
mesh scourers, which are suitable for
domestic use, for cleaning the sensor studs.
1. Remove the sensor from the tank
2. Check the probes for build up of
contamination
3. Use clean soapy water
4. Place scourer in water to dampen
5. Apply scourer to the sensor probes with
limited pressure
6. Rub sensor probes removing contamination
7. Swill sensor probes with fresh clean water
8. Replace sensor into tank.
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