SMAR ld301 - Totalization Configuration; Table Points

Configuration
3.11
X Y
0 % (-100 mbar) 100 %
20 % (0 mbar) 0 %
100 % (400 mbar) 100 %
NOTE
To configure a symmetrical bidirectional flow double the number of calibration points to get a better
performance.
Next, configure the cutting point. Refer to the previous Root item.
Table Points
If the option TABLE is selected, the output will follow a curve given in the option TABLE POINTS. If the
user wants to have your 4-20 mA proportional to the fluid volume or mass inside a tank, he must
transform the pressure measurement "X" into volume (or mass) "Y" using the tank strapping table, as
the example shown in Table 3.3.
POINTS
LEVEL
(PRESSURE)
X VOLUME Y
1
- -10 % - -0.62 %
2
250 mmH
2
O 0 % 0 m
3
0 %
3
450 mmH
2
O 10 % 0.98 m
3
5.22 %
4
750 mmH
2
O 25 % 2.90 m
3
15.38 %
5
957.2 mmH
2
O 35.36 % 4.71 m
3
25 %
6
1050 mmH
2
O 40 % 7.04 m
3
37.36 %
7
1150 mmH
2
O 45 % 8.23 m
3
43.65 %
8
1250 mmH
2
O 50 % 9.42 m
3
50 %
.
.
.
.
.
.
.
.
.
.
15
2250 mmH
2
O
100 % 18.85 m
3
100 %
16
- 110 % - 106 %
Table 3.3 - Tank Strapping Table
As shown on the previous example, the points may be freely distributed for any desired value of X. In
order to achieve a better linearization, the distribution should be concentrated in the less linear parts of
the measurement.
The LD301 includes an internal feature to enable and disable the Linearization Table.
Totalization Configuration
When the LD301 works in flow applications it is often desirable to totalize the flow in order to know the
accumulated volume or mass that has flown through the pipe/channel.
The totalizer integrates the PV% along time, working with a time scheduling based on seconds, as per
the following formula:
dtPV
INCREMENTONTOTALIZATI
FLOWRATEMAXIMUM
TOT %


The method uses such totalization and, through three parameters (MAXIMUM FLOWRATE, TOTAL
INCREMENT and TOTAL UNIT), converts it to the user-defined totalizing unit:
 MAXIMUM FLOW RATE - this is the maximum flow rate expressed in volume or mass units per
second, corresponding to the measurement (PV%=100%). For example: m3/s, bbl/s, kg/s, lb/s;