VEGA VEGAMET 391 With SIL qualification - Manual (Page 22)

22
7 Setup with the integrated display and adjustment unit
VEGAMET 391 • With SIL qualification
38704-EN-130228
Through the adjustment, the input value of the connected sensor is
converted into a percentage value. This conversion steps allows to
image any individual input value range to a relative range (0 % to
100 %). With the adjustment in mA, two sensor current values are
entered which correspond ideally to the levels 0 % and 100 %. As
an alternative, sensor current values corresponding to any level in
percent can be entered. The greater the difference between these
values, the more exact the measurement will be.
1. With [OK] you prepare the percentage value for editing, with [->]
you place the cursor to the requested position. Set the requested
percentage value with [+] and save with [OK].
2. After entering the percentage value for the min. adjustment, the
suitable current value must be entered. If you want to use the
currently measured value, select the menu item "Accept" (live ad-
justment or adjustment with medium). If the adjustment should be
carried out independently of the measured level, then select the
option "Edit". Now enter the current value in mA that is suitable
for the percentage value (dry adjustment i.e. adjustment without
medium).
3. Save your settings with [OK] and move to "Max. adjustment" with
[->].
4. As described previously, enter now the percentage value for max.
adjustment and confirm with [OK].
5. After entering the percentage value for the max. adjustment, the
suitable current value must be entered. If you want to use the
currently measured distance value, select the menu item "Accept"
(live adjustment or adjustment with medium). If the adjustment
should be carried out independently of the measured level, then
select the option "Edit". Now enter the current value in mA that is
suitable for the percentage value (dry adjustment i.e. adjustment
without medium).
6. Finally save your settings with [OK], the adjustment is finished.
To suppress fluctuations in the measured value display, e.g. caused
by an agitated product surface, an integration time can be set. This
time can be between 0 and 999 seconds. Remember that the reaction
time of the entire measurement will then be longer and the sensor will
react to measured value changes with a delay. In general, a period of
a few seconds is sufficient to smooth the measured value display.
Note:
The damping does not influence all safety-relevant outputs (relay 3/4,
current output).
Meas. loop - Adjustment
Meas. loop - Damping