Vega VEGAPULS 62 Operating Instructions Manual page 44

Set up with the indicating and adjustment module PLICSCOM
Linearisation curve
Gating out of false sig-
nals
44
A linearization is necessary for all vessels in which the vessel
volume does not increase linearly with the level - e. g. with a
cylindrical or spherical tank - and 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.
By activating the appropriate curve, the volume percentage 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".
Linearisation curve
linear
Enter the requested parameter via the appropriate keys, save
your settings and jump to the next menu item with the [->] key.
Caution:
Note the following, if VEGAPULS 62 is used as part of an
overfill protection system according to WHG:
If a linearisation curve is selected, the measuring signal is no
longer compulsorily linear proportional to the level. This must
be taken into consideration by the user, particularly when
adjusting the switching point on the level switch.
High sockets or vessel installations, such as e. g. struts or
agitators as well as buildup and weld joints on the vessel walls
cause interfering reflections which can impair the measure-
ment. A false echo storage detects and marks these false
echoes, so that they are no longer taken into account for the
level measurement. A false echo memory should be created
with empty vessel so that all potential interfering reflections will
be detected.
Gating out of false signals
Change now?
Proceed as follows:
1 Move from the measured value display to the main menu
by pushing [OK].
VEGAPULS 62 • 4 ... 20 mA/HART