VEGA VEGAPULS 67 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART four-wire - Manual (Page 33)

I n liquids, fluctuating surfaces and foam generation are further
interfering factors. To adapt the sensor to the different conditions, a
general selection is made in this menu item, i.e. "Solid" or "Liquid".
E
nter the requested parameters via the appropriate keys, save your
settings and jump to the next menu item with the [->] key.
A part from the medium, the vessel shape can also influence the
measurement. To adapt the sensor to these measuring conditions, this
menu item offers different options depending on whether liquid or solid
is selected. With "Solid" these are "Silo" or "Bunker", with "Liquid",
"
Storage tank", "Stilling tube", "Open vessel" or "Stirred vessel".
V essel form
Silo
E nter the requested parameters via the appropriate keys, save your
settings and jump to the next menu item with the [->] key.
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
F alse reflections by vessel installation can impair the measurement as
described in chapter "Mounting". A false echo storage detects and
marks these false echoes, so that they are no longer taken into
account for the level measurement. To detect these interfering
reflections over the complete measuring range, the gating out of false
echoes should be carried out with empty vessel.
Vessel form
Linearisation curve
Gating out of false sig-
nals
VEGAPULS 67 • 4 … 20 mA/HART four-wire 33
6 S et up with the indicating and adjustment module PLICSCOM
32939
-EN
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