VEGA VEGAMET 515V - Manual (Page 47)

VEGAMET 515V 47
Additional functions
8 Additional functions
8.1 Linearisation curves
Linearisation curve 1 … 3
A linearisation curve is generated by a cer-
tain number of index markers and their value
pairs. A value pair consists of a value for
level percent (X %) and a value for volume
percent (Y V %). Up to max. 32 index mark-
ers can be included. A linearisation curve can
be terminated after any individual number of
index markers. The signal conditioning instru-
ment terminates the linearisation curve auto-
matically with the values X = 100 % and Y
= 100 %.
The data for the value pairs can be deter-
mined by incremental filling or can be taken
from value tables provided by vessel manu-
facturer.
Example of incremental filling
Initial situation:
- the adjustment 0 % and 100 % has already
been carried out by you
- the total volume of the vessel is known to
you, for example 300 m 3
- the gauging volume (increment) in this
example was set at 15 m³
1st index marker
- fill the vessel with the liquid quantity of the
gauging volume (increment) of 15 m 3
- the value for level percent is indicated on
VEGAMET, transfer this value into the lin-
earity protocol, column X %
- the value for volume percent must be cal-
culated acc. to the following formula
100 % x gauging volume
Y 1 V = ––––––––––––––––––––––––
total volume
100 % x 15 m 3
= ––––––––––––––– = 5 %
300 m 3
Transfer this value also into the linearity
protocol, column Y V %.
2nd index marker etc.
See also the following illustration.
Param.
TAG-
No. 1 Confi-
gura-
tion Add’l
funct.
Pass-
word
off
TAG -
No. 1
%
xx,x
Edit
lin.
curve
Lin.
curve1
Edit lin.
curve 1
x 0 %
0,0
y 0 V%
0,0
Add
lin.
point Delete
lin.
point
x %
0,0
y V%
0,0
x 0,0
y 0,0
delete
Delete
Now?
x 1 %
100,0
y 1 V%
100,0
x 2 %
100,0
y 2 V%
100,0
x 32 %
100,0
y 32V%
100,0
like LIN curve 1
Index marker number (0…32)
Lin.
curve2 Lin.
curve3
x 100,0
y 100,0
delete
Delete
Now?