Siemens SITRANS LG270 Operating Instructions Manual page 37

Setup - Min. adjustment -
Interface
Setup - Damping
Setup - Linearisation
PBD-51041064
This menu item is only available if you have selected interface meas-
urement under the menu item "Application".
Enter the requested percentage value for the min. adjustment (inter-
face).
Enter the respective distance value in m for the interface correspond-
ing to the percentage value of the interface.
To damp process-dependent measured value fluctuations, set an
integration time of 0 ... 999 s in this menu item.
If you have selected interface measurement under the menu item
"Application", you can adjust the damping for the level and the inter-
face separately.
The default setting is a damping of 0 s.
A linearisation is necessary for all vessels in which the vessel volume
does not increase linearly with the level - e.g. a horizontal cylindri-
cal or spherical tank, when the indication or output of the volume is
required. Corresponding linearisation curves are preprogrammed
for these vessels. They represent the correlation between the level
percentage and vessel volume.
The linearisation applies to the measured value indication and the
current output. By activating the appropriate curve, the volume per-
centage of the vessel is displayed correctly. If the volume should not
be displayed in percent but e.g. in l or kg, a scaling can be also set in
the menu item "Display".
Warning:
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 following, you have to enter the values for your vessel, for
example the vessel height and the socket correction.
SITRANS LG270 - Operating Instructions
37