VEGA VEGAFLEX 66 (-20…+250°C) 4 … 20 mA_HART two-wire - Manual (Page 31)

A
linearization is necessary for all vessels in which the vessel volume
does not increase linearly with the level - e.g. in a horizontal 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".
L inearisation curve
linear
E nter the requested parameters via the appropriate keys, save your
settings and jump to the next menu item with the [->] key.
Caution:
N
ote the following, if VEGAFLEX 66 is used as part of an overfill
protection system according to WHG:
I f 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.
I n this menu item you can enter an unambiguous designation for the
sensor, e.g. the measurement loop name or the tank or product
designation. In digital systems and in the documentation of larger
plants, a singular designation should be entered for exact identification
of individual measuring points.
S ensor-TAG
Sensor
W ith this menu item, the Basic adjustment is finished and you can now
jump to the main menu with the [ESC] key.
H igh 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 measurement. 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.
Linearisation curve
Sensor-TAG
Gating out of false sig-
nals
VEGAFLEX 66 • 4 … 20 mA/HART two-wire 31
6 S et up with the indicating and adjustment module PLICSCOM
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