Siemens SITRANS LG250 Operating Instructions Manual page 37

Setup - Damping
Setup - Linearization
PBD-51041387
Enter the respective distance value in m for the empty vessel cor-
responding to the percentage value.
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 linearization 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 linearization curves are preprogrammed
for these vessels. They represent the correlation between the level
percentage and vessel volume.
The linearization 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 adjusting 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.
For non-linear vessel forms, enter the vessel height and the socket
correction.
For the vessel height, you have to enter the total height of the vessel.
For the socket correction you have to enter the height of the socket
above the upper edge of the vessel. If the socket is lower than the up-
per edge of the vessel, this value can also be negative.
SITRANS LG250 - Operating Instructions
37