Vega VEGABAR 87 Operating Instructions Manual page 30

6 Set up with the display and adjustment module
Position correction
Adjustment
30
Unit of measurement:
If the level should be adjusted in a height unit, the density of the me-
dium must also be entered later during the adjustment.
In addition, the temperature unit of the instrument is specified. The
selection determines the unit displayed in menu items "Peak value,
temperature" and "in the variables of the digital output signal".
Temperature unit:
Enter the requested parameters via the appropriate keys, save your
settings with [OK] and jump to the next menu item with the [ESC] and
the [->] key.
Especially with chemical seal systems, the installation position of the
instrument can shift (offset) the measured value. Position correction
compensates this offset. In the process, the actual measured value
is taken over automatically. With relative pressure measuring cells a
manual offset can also be carried out.
Note:
If the current measured value is automatically accepted, it must not
be falsified by medium coverage or static pressure.
With the manual position correction, the offset value can be deter-
mined by the user. Select for this purpose the function "Edit" and
enter the requested value.
Save your settings with [OK] and move with [ESC] and [->] to the
next menu item.
After the position correction is carried out, the actual measured value
is corrected to 0. The corrective value appears with an inverse sign as
offset value in the display.
The position correction can be repeated as often as necessary. How-
ever, if the sum of the corrective values exceeds 20 % of the nominal
measuring range, then no position correction is possible.
VEGABAR 87 always measures pressure independently of the pro-
cess variable selected in the menu item "Application". To output the
selected process variable correctly, an allocation of the output signal
to 0 % and 100 % must be carried out (adjustment).
VEGABAR 87 • 4 ... 20 mA