Endress+Hauser Micropilot S FMR531, Руководство по эксплуатации

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Commissioning Micropilot S FMR531 with HART/4...20 mA
54 E Hauser
Dip table
The dip table is used to correct the level readings of the Micropilot S using independently taken hand
dips. The dip table is used in particular to adapt the level gauge to the specific application conditions
as mechanical offset and tank/stilling well design. Depending on national regulations, national
inspectors will dip the tank at one to three levels during a calibration run and check the level
readings. Only one value pair must be entered into the dip table to correct the measurement
offset .
If a second value pair is entered into the dip table, the Micropilot S accepts the corrected measured
values identically for both value pairs. All other measured values are determined by linear
extrapolation. If you enter more than two value pairs, the system carries out a linear interpolation
between adjacent value pairs. Outside these value pairs, extrapolation is also linear.
L00-FMR53xxx-19-00-00-en-014
To collect and enter data into the dip table, two alternative procedures may be carried out. In order
not to mix up measurement values corrected by the offset or linearisation of the dip table with
uncorrected measurement values, it is recommended to use the semi-automatic mode of the dip
table to enter new data pairs. In this case, the first dip value should be entered immediately after
the basic calibration. Further linearization points should be entered only after a level change of at
least 2 m (cf. upper figure, preferred choice) and a deviation between the "uncorrected
measurement value" and the hand dip value of at least 4mm. If this procedure can not be followed,
then
NO value pair should be entered into the dip table after basic calibration. Measurement data
and hand dip values should be collected over the full measurement range and be evaluated with
regard to a good linear fit. Only then characteristic value pairs should be entered into the dip table
using the "manual mode" (cf. upper figure, right side). If further linearisation is needed, further hand
dip values should be entered
using only the "semi-automatic mode ".
basic setup
history reset
dip table
alternatives
preferred choice:
and
immediate
correction in
mode
or adjust empty calibration
hand dip
offset
semi-automatic
collect hand dip and
measurement data over
full measurement range
collect further hand dip data;
if deviation from measurements
> 4 mm and level change > 2 m:
enter a new dip value
into dip table using the
mode semi-automatic
evaluate collected data;
enter characteristic value
pairs into the dip table
using the manual mode