VEGA VEGAPULS 61 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA__HART two-wire User Manual
Page 40
A
linearization is necessary for all vessels in which the vessel volume
does not increase linearly with the level - e.g. with 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 VEGAPULS 61 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.
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 low level so that all potential interfering reflections will
be detected.
G
ating out of false signals
C
hange now?
P
roceed as follows:
1
M
ove from the measured value display to the main menu by
pushing [OK].
2
S
elect the menu item "Service" with [->] and confirm with [OK].
N
ow the menu item "False signal suppression" is displayed.
Linearisation curve
Gating out of false sig-
nals
40
VEGAPULS
61 • 4 … 20
mA/HART two-wire
6 S
et up with the indicating and adjustment module PLICSCOM
28434
-EN
-100426