Water Level Sensor And Cleaning - Swift Group Select 122 Owner's Handbook Manual

WAT ER LEVEL SEN S OR AN D C L EA NIN 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 studs, at different positions, are
immersed in the fresh or waste water, and use
the conductivity of water, between the studs,
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 studs and the various different studs,
indicating water present.
Normally, even if the studs are dirty, and
providing the studs 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 studs. False water level
readings at the control unit can be caused by
calcium build-up or foreign objects within the
tank bridging the studs. (Especially with waste
tanks).
To clean the 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 studs 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 studs removing contamination
7. Swill sensor studs with fresh clean water
8. Replace sensor into tank.
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