Through the adjustment the input value of the connected sensor is
converted into a percentage value. This conversion step allows any
input value range to be depicted in a relative range (0 % up to 100 %).
Before carrying out the adjustment, the requested adjustment unit can
be selected. With the input selection "Analogue", the adjustment unit is
always "mA". If the HART input is activated, the available unit depends
on the sensor type. With radar, ultrasonic and guided microwave this is
always "m(d)" or "ft(d)", and with pressure transmitters it is e.g. "bar" or
"psi".
The following illustrations and examples relate to the min./max.
adjustment of a radar sensor with HART communication.
à With [OK] you prepare the percentage value for editing, with [->]
you set the cursor to the requested position. Set the requested
percentage value with [+] and save with [OK].
à After entering the percentage value for the min. adjustment, the
suitable distance value must be entered. If you want the use the
currently measured distance value, select the menu item "Accept"
(live adjustment or adjustment with medium). If the adjustment
should be carried out independent of the measured level, t hen
select the option "Edit". Enter now the distance value in m [m(d)]
for the empty vessel that is suitable for the percentage value, e.g.
distance from the sensor to the vessel bottom (dry adjustment or
adjustment without medium).
à Save your settings with [OK] and move to "Max. adjustment" with
[->].
à As described previously, enter now the percentage value for max.
adjustment and confirm with [OK].
à After entering the percentage value for the max. adjustment, the
suitable distance value must be entered. If you want the use the
currently measured distance value, select the menu item "Accept"
(live adjustment or adjustment with medium). If the adjustment
should be carried out independent of the measured level, select
the option "Edit". Enter now the distance value in m [m(d)] for the
Meas. loop - Adjustment
22 VEGAMET 391 • 4 … 20 mA/HART signal conditioning instrument
6 Setup with the integrated indicating and adjustment unit
36032-EN-091116
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