VEGA VEGASON 54V…56V - Manual (Page 59)

VEGASON 54V … 56V 59
Max. 32 index markers can be entered per
linearisation curve (value pairs).
Calculating the linearisation curve
(using previous tank example)
In the menu window " Linearisation -- user
programmable curve --“ you can start the
vessel calculation program. With the vessel
calculation program you can calculate (using
dimensions from the technical drawings of
the vessel) the correlation of filling height to
filling volume. If the curve is defined this way,
gauging by incremental filling is not neces-
sary - your sensor will output volume as a
function of level.
Max.
Min.
100 % (1.270 m) correspond
to 1200 liters
Span (4.58 m)
0 % (5.850 m) correspond to
45 liters
• Click to
"Calculate“.
Index marker 1 is at 0 % filling ( percentage
value [%]), corresponding in the example to
an actual distance to the product surface of
5.850 m (empty vessel). The volume quantity
is 45 liters (fluid remaining in the vessel).
Index marker 2 is at a filling level of 30 %
(30 % of the meas. distance of
1.270 m … 5.850 m). At a filling level of 30 %,
there are 576 liters in the vessel (in our exam-
ple).
Index marker 3 is at a filling level of 60 %. At
this filling level there are 646 liters in the ves-
sel.
Index marker 4 is at a filling level of 100 %
(product distance 1.270 m), where 1200 liters
are in the vessel.
Setup - Adjustment with the PC on VEGAMET
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.
• 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).