VEGA VEGASCAN 850 - Manual (Page 76)

76 VEGASCAN 850
0 m
100 % or 1.27 m
95.79 % or 1.463 m
Span
4.58 m
100 %
4.387 m
(95.79 %)
5.85 m or 0 %
The user programmable linearisation curve is
generated by index markers. Each index
marker consists of one value pair. A value
pair is generated out of a value "
Linearised“
and a value " Percentage value“. "Percentage
value“ represents the percentage value of
the level. "
Linearised“ represents the per-
centage vessel volume at a certain percent-
age value of the level.
In the field " Transfer measured value“ the
current level as percent of the adjusted span
is displayed. The measuring span has al-
ready been adjusted with the min./max. ad-
justment. In our example, the measuring
span is 4.58 m and is in the range of 5.85 m
(empty) up to 1.27 m (full), see the following
illustration.
• Click the check box
"Show scaled values“,
to have the selected measuring unit dis-
played on the y-axis (bottom left in the
menu window).
Setup - Adjustment with the PC
5.85 m meas. distance correspond to 0 %
level. 1.27 m meas. distance correspond to
100 % level. The measuring span is therefore
4.58 m (5.85 m – 1.27 m = 4.58 m).
The percentage value of 95.79 % means that
now 4.387 m of the adjusted measuring
span (4.58 m) are reached:
4.58 • 0.9579 = 4.387 m.
The distance (product distance) outputted
by the sensor, in case you have chosen
"
distance“ as output parameter, is then:
5.85 – (4.58 • 0.9579) = 1.463 m.
If the index markers or value pairs of your
vessel are not known, you have to define the
linearisation curve by incremental filling or
calculate it with the vessel calculation pro-
gram of VVO (see next page).
Defining the linearisation curve by incre-
mental filling
In the characteristics of the example, you see
four index markers or value pairs. There is
always a linear interpolation between the
index markers. The example vessel consists
of three cylindrical segments of different
height and diameter. The middle segment
has a considerably smaller diameter.