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Version 1.3 11/12/11
47
C o r p o r a t io n
LEVEL ADJUSTMENT
For this routine it is necessary to have a reference level that can be used to compare the
systems top level that the SWO senses.
To calibrate the scaling for the analogue sensor apply a level to the system and allow it to
stabilise. This can be done by manually filling the reservoir or via compressed air to
simulate level. This should hold system level evenly and remove any fluctuations that are
prevalent without any pumps are running.
This level should be as close as possible to the normal system level, as the calibration
routine works best with an end of scale reading.
Go to the “Adjust Level” screen. The level on this screen should match the level on a
gauge in the system or scaled to suit reservoir / pit tank (i e 100 = 100cm of vertical
height). If it does not press ENTER and then either UP or DOWN to move the displayed
level to match the gauge or measured level.
There is a buffer that takes approximately 5 seconds to stabilise so wait for this period to
make sure that the reading is stable before accepting or editing the settings.
Once the readings match and are steady then the scaling is calibrated. Press ENTER
again and back out of the menu to initiate a store of the “Adjust level” value.
GENERAL
.
The basis for these calibrations is that the sensor used has a linear error if the instrument
that is being used has a non-linear error then the system readings will be inaccurate.
The standard transducer used with SWO has these characteristics and also is
fitted with temperature compensation to eliminate possible transducer drift with
temperature.
With standard transducers you will be able to read level to an accuracy of
4% under normal conditions..
