40
6 Set up the sensor with the display and adjustment module
VEGADIF 85 • Profibus PA
53569-EN-230814
Unit, static pressure:
The unit "Static pressure" is also set here.
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.
The installation position of the instrument can shift the measured
value (offset). The position correction function compensates this
offset. In the process the current measured value can be accepted
automatically.
VEGADIF 85 has two separate sensor systems: one sensor for dif
-
ferential pressure and one sensor for static pressure. The following
possibilities thus result for position correction:
•
Automatic correction for both sensors
•
Manual correction for differential pressure
•
Manual correction for static pressure
During an automatic position correction, the current measured value
is accepted as the correction value. This value must not be influ
-
enced/corrupted by product coverage or static pressure.
In case of a manual position correction, the offset value is determined
by the user. Select for this purpose the function "
Edit
" and enter the
requested value.
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 correction value must be within the nominal measuring range, re
-
gardless of whether the correction value is determined automatically
or entered manually. Depending on the correction value, the nominal
measuring range apparently decreases or increases. However, this
is only a consequence of the calculated offset. The actual nominal
measuring range does not change. The following graphic illustrates
this:
3
4
1
2
0
4
Fig. 39: Example correction value
1 Lower limit of the nominal measuring range
2 Upper limit of the nominal measuring range
3 Correction value (example); shown as "0" on display
4 Apparently decreased/increased nominal measuring range
Position correction