5.2
Linearization for a tank with conical outlet
Manual entry
V2H0 = 3, V6H0 = 3
This option allows you to enter your own characteristic, whereby to possibilities exist for
entering levels:
•
By hand, in this case both level and volume parameters should be entered in
a table prior to configuration. A level calibration can always bee performed.
•
Automatically: the tank is filled in known volume increments and the
measured level is written into V2H4/V6H4 by the system. This method can be
used when the volume/level 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/V4H9 have no significance. The entry mode is selected at V2H1/V6H1:
•
0 = manual,
•
1 = automatic.
At the end of the linearization the system measures in the volume units selected, e.g.
m
3
, ft
3
, t, %. Use the Tables overleaf to enter your values.
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 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!"
BA064E40
Datum level for
calibration and
linearization must be
the same
Last level entry must
correspond to 100% full
0/4
…
20 mA signal
follows volume
Level (or volume) in
units used for
calibration
4.5
0.0
0
50
100
200
270
m
3
Units of volume
4.25
1.5
1.0
0.5
V0H1
V0H2
Fig. 5.3:
Linearization for a vessel with a
conical outlet
Silometer FMC 672 Z/677 Z
Chapter 5: Linearization
29
Содержание Silometer FMC 672 Z
Страница 6: ...Silometer FMC 672 Z 677 Z Notes on Safety 4...
Страница 59: ...Silometer FMC 672 Z 677 Z Operating matrix...
Страница 62: ...Silometer FMC 672 Z 677 Z Operating matrix...
Страница 63: ...Silometer FMC 672 Z 677 Z Operating matrix...
