4.2
Calibration for level measurement
This calibration requires the determination of two parameters,
•
an »empty« level at V0H1,
•
a »full« level at V0H2.
After calibration
If the level is entered in %, after the calibration:
•
% level is displayed at V0H0
•
the 0/4
…
20 mA signal range corresponds to 0
…
100% level
•
the parameters »offset« and »sensitivity« are calculated and stored at
V3H1/V3H2.
If the level is entered in m, ft. etc. the analogue outputs must be set in the same units,
see Chapter 6.
Procedure
Step
Matrix
Entry
Significance
1
V0H1
e.g. 10%
Fill the vessel until the probe is covered (ca. 0
…
40%) and
enter the level you wish to have displayed.
2
-
»E«
Register entry
3
V0H2
e.g. 95%
Fill the vessel as far as possible (ca. 60
…
100%) and
enter the level you wish to have displayed.
4
-
»E«
Register entry
5
V0H0
The measured value is shown in the units selected.
Note!
•
The calibration can be performed in reverse order
•
For bulk solids, the probe measures the depth of emersion in the product only.
Account for any filling mound or outflow depression by the entered levels.
•
For the Deltapilot S (liquids only), a »dry calibration« can be made see Section 4.4.
•
If appropriate, a linearization can now be carried out, see Chapter 5.
»Full«
V0H2
e.g. 95% or 5 m
BA119Y27
Capacitance probe
Capacitance probe
»Empty«,
V0H1
e.g. 10% or 0.5 m
Fig. 4.1:
Parameters required for
calibration of the Silometer
FMX 570 for level measurement
shown for bulk solid
measurement.
Any filling mound or outflow
depression can be accounted for
by the parameters entered.
Silometer FMX 570
Chapter 4: Calibration and Operation
18
