Endress+Hauser silometer FMC 671 Z, Operating Instruction, Page: 25 / 68

mode 1. This corresponds to the calibration described in Section 4.2.
4.2 Empty/full 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
•
Limit relay 1 trips at 90% (maximum fail-safe)
•
the parameters »offset« and »sensitivity« are calculated and stored at
V3H1/V3H2.
If the level is entered in m, ft. etc. the analogue outputs and relay switching points must
be set in the same units, see Chapters 6 and 7.
Procedure
Step Matrix Entry Significance
1 V0H1 e.g. 10% Fill the vessel until the probe is covered (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 (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.
»Full« V0H2
e.g. 95% or 5 m
BA063E27
Capacitance probe
Capacitance probe
»Empty«, V0H1
e.g. 10% or 0.5 m
Fig. 4.1:
Parameters required for
calibration of the Silometer
FMC 671 Z/676 Z for level
measurement shown for bulk
solid measurement.
Any filling mound or outflow
depression can be accounted for
by the parameters entered.
Silometer FMC 671 Z/676 Z Chapter 4: Calibration and Operation
23