WIKA DPT-20, Руководство по эксплуатации

Страница: 45 / 88

45
6 Set up the sensor with the display and adjustment module
WIKA Operating Instructions - Differential pressure transmitter DPT-20
4. Enter the max. height of the interface corresponding to the per-
centage value.
The max. adjustment for interface is finished.
To damp process-dependent measured value fluctuations, set an
integration time of 0 … 999 s in this menu item. The increment is 0.1 s.
The setting in the delivery status depends on the sensor type.
A linearization is necessary for all applications in which the measured
process variable does not increase linearly with the measured value.
This applies for example to the flow measured via the differential
pressure or the vessel volume measured via the level. Correspond-
ing linearization curves are preprogrammed for such cases. They
represent the correlation between the measured value percentage
and process variable. The linearization applies to the measured value
indication and the current output.
Caution:
Note the following, if the respective sensor is used as part of an over -
fill protection system according to WHG:
If a linearisation curve is selected, the measuring signal is no longer
necessarily linear to the filling height. This must be considered by the
user especially when setting the switching point on the limit signal
transmitter.
In the menu item " Lock/unlock adjustment " you safeguard the sensor
parameters against unauthorized or unintentional modifications.
With active PIN, only the following adjustment functions are possible
without entering a PIN:
•
Select menu items and show data
•
Read data from the sensor into the display and adjustment module
Releasing the sensor adjustment is also possible in any menu item by
entering the PIN.
Caution:
With active PIN, adjustment via PACTware/DTM and other systems is
also blocked.
Damping
Linearisation
Lock/Unlock adjustment