VEGA VEGAPULS 45 VBUS - Manual (Page 58)

58 VEGAPULS 42, 44 and 45 – VBUS
Adjustment with the PC on the signal conditioning instrument
Max.
Min.
100 % (1.270 m) correspond
to 1200 liters
Span (4.58 m)
0 % (5.850 m) correspond to
45 liters
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.
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.
• Click to
"Calculate".
The tank calculation program starts. In the
top left corner you choose the vessel type
(upright tank, cylindrical tank, spherical tank,
individual tank form or matrix). When choos-
ing matrix, you can enter a user-programma-
ble linearisation curve by means of index
markers. This corresponds to the input of
value pairs (linearisation points), as previ-
ously described.
In the following example, the tank calculation
program calculates the linearisation curve of
a vessel corresponding to the vessel in the
previous gauging example.
• Click to "
individual tank form" and choose
three round tank segments with the dimen-
sions 0.88 m • 0.9 m (height by diameter),
0.66 m • 0.47 m and 0.66 m • 1.12 m (this
tank form corresponds to the tank form of
the gauging example).