Endress+Hauser Silometer FMC 672 Z, Инструкция по установке и эксплуатации

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4.2 Calibration: level measurement
The calibration for operating mode 0 requires the determination of two parameters, in
any order, for each measurement channel:
•
an »empty« level: at V0H1 for channel 1 and V4H1 for channel 2,
•
a »full« level: at V0H2 for channel 1 and V4H2 for channel 2.
For modes 1 and 2, the parameters for the selected channel only are entered.
After calibration If the level is entered in %, after the calibration:
•
% level is displayed at V0H0/channel 1 and V4H0/channel 2
•
The 0/4
…
20 mA signal range corresponds to 0
…
100%
•
The limit relays trip at 90% (maximum fail-safe)
•
The parameters »offset« and »sensitivity« are calculated and stored at
V3H1/V3H2 for channel 1 and V7H1/V7H2 for channel 2.
If the level is entered in m, ft, etc. the analogue outputs and relay switching points must
be set in the same units
Procedure
Step Matrix Entry Significance
1 V0H1 e.g. 10% Fill the vessel until the sensor is covered (0
…
40%) and
enter the level you wish to have displayed,
2 - »E« Register entry
3 V0H2 e.g. 90% Fill the vessel (60
…
100%) and enter the level
4 - »E« Register entry
5 V4H1/V4H2
…
Repeat steps 1 and 2 for channel 2
6 V0H0/V4H0
…
The measured value is shown in the units selected.
Note!
•
The calibration can be made in the reverse order.
•
For bulk solids, the probe measures the depth of emersion in the product only. Any
filling mound or emptying depression is accounted for by the parameters entered.
BA064E25
»Full« V0H2
V4H2
e.g. 90 % or 5 m
»Empty«, V0H1
V4H1
e.g. 10 % or 0.5 m
Fig. 4.1:
Parameters required for
calibration of the Silometer
FMC 672 Z/677 Z for level
measurement.
In the case of bulk solids any
filling mound or emptying
depression can be accounted for
by the parameters entered
Silometer FMC 672 Z/677 Z Chapter 4: Calibration and Operation
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