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6 Set up the sensor with the display and adjustment module
WIKA Operating Instructions - Differential pressure transmitter DPT-20
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.
DPT-20 has two separate sensor systems: one sensor for differential
pressure and one sensor for static pressure. The following possibili
-
ties 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 position correction can be repeated any number of times.
DPT-20 always measures pressure independently of the process vari
-
able 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).
When using the application "
Level
", the hydrostatic pressure, e.g.
with full and empty vessel, is entered as adjustment value. A super
-
imposed pressure is detected by the low pressure side and automati-
cally compensated. See the following example:
Position correction
Adjustment
