5.2 Linearization for a tank with conical outlet
Manual entry
V2H0 = 3
This option allows you to enter your own characteristic, whereby two possibilities exist
for entering the level values:
• By hand: in this case both level and volume/weight parameters should be
calculated and entered in a table prior to configuration. A level calibration can
always be performed.
• Automatically: the tank is filled or emptied in known volume increments and
the measured level is written into V2H4 by the system. This method can be
used when the level/volume relationship is not known.
The automatic mode can also be used if you can calibrate in volume units only: perform
the volume calibration first, e.g. when filling the tank, followed by the linearization with
»level registration« e.g. when emptying the tank. In this case, however, the »level« values
displayed at V0H9 have no significance.
The entry mode is selected at V2H1:
• 0 = manual,
• 1 = automatic.
At the end of the linearization the system measures in the volume/weight units selected,
e.g. m
3
, ft
3
, t, %.
Note!
• You must enter at least two points:
- The first level point should be below or at the level of the sensor. If it is not and the
level drops below the first point, the linearization will extrapolate back!
- The last level point should be greater than or equal to the maximum level to be
measured.
- The maximum value for V2H3 and V2H4 is 9998; 9999 cancels the entry.
• The maximum number of points is 30
• When all points have been entered and the linearization is activated, the points are
sorted in rising volume and subjected to a plausibility check!
Level (m)
V0H9
Datum level for
linearization
Volume V0H0
Max. level = 4.75 m
10 m 0
20.5 m 2
31.0 m 10
41.5 m 27
5 4.25 m 220
6 4.75 m 260
BA060E40
0.0
1.0
2.0
3.0
4.0
50 100 150 200 250
»Empty« = 1m
»Full« = 4.25 m
Fig. 5.3:
Linearisation for a vessel
with a conical outlet
Silometer FMC 671 Z/676 Z Chapter 5: Linearization
29
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