VEGA VEGAFLEX 65 4 … 20 mA_HART four-wire User Manual
Page 24
E
ach product has different reflective properties. In addition, there are
various interfering factors which have to be taken into account:
agitated product surfaces and foam generation (with liquids); dust
generation, material cones and echoes from the vessel wall (with
solids). To adapt the sensor to these different conditions, you should
fi
rst select in this menu item under "Medium" either "Liquid" or "Solid".
W
ith coax versions, this menu item must be set to "Liquid".
A
pplication
Liquid
Standard
(DK ≥ 2)
M
easured products have different reflective properties depending on
their respective permittivity (dielectric constant). That's why there is an
additional selection option.
U
nder "Sensitivity" you can select "Standard (DK ≥ 2)" or "Increased
sensitivity (DK < 2)".
T
hrough this the sensor is optimally adapted to the product and
measurement reliability, particularly in products with poor reflective
properties, is considerably increased.
E
nter the requested parameters via the appropriate keys, save your
settings and jump to the next menu item with the [->] key.
T
o suppress fluctuations in the measured value display, e. g. caused
by an agitated product surface, a damping can be set. This time can
be between 0 and 999 seconds. Keep in mind that the reaction time of
the entire measurement will then be longer and the sensor will react to
measured value changes with a delay. In general, a period of a few
seconds is sufficient to smooth the measured value display.
D
amping
0
s
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".
Application
Damping
Linearisation curve
24
VEGAFLEX
65 • 4 … 20
mA/HART - four-wire
6 S
et up with the indicating and adjustment module PLICSCOM
31846
-EN
-120329