NivoRadar
®
Continuous level measurement
Series NR 4000
Technical information / Instruction manual
Diagnostics and servicing
page 42
Bulk solids: Measurement error during filling
Fault description
Cause
Rectification
Measured value jumps to-
wards 0 % during filling
Level
time
0
The level echo cannot be distinguished
from the false signal at a false signal
position (jumps to multiple echo)
Remove/reduce false signal: minimize
interfering installations by changing the
polarization direction
Chose a more suitable installation po-
sition
Transverse reflection from an extrac-
tion funnel, amplitude of the transverse
reflection larger than the level echo
Direct sensor to the opposite fun-
nel wall, avoid crossing with the filling
stream
Measured value fluctuates
around 10 … 20 %
Level
time
0
Various echoes from an uneven medi-
um surface, e.g. a material cone
Check parameter "Material Type" and
adapt, if necessary
Optimize installation position and sen-
sor orientation
Reflections from the medium surface
via the vessel wall (deflection)
Select a more suitable installation po-
sition, optimize sensor orientation, e.g.
with a swivelling holder
Measured value jumps spo-
radically to 100 % during
filling
Leve
l
time
0
Changing condensation or contamina-
tion on the antenna
Carry out a false signal suppression or
increase false signal suppression with
condensation/contamination in the
close range by editing
Bulk solids: Measurement error during emptying
Fault description
Cause
Rectification
Measured value remains un-
changed in the close range
during emptying
Level
time
0
False signal greater than level echo or
level echo too small
Eliminate false signals in the close
range. Check: Antenna must protrude
out of the nozzle
Remove contamination on the antenna
Minimize interfering installations in the
close range by changing the polariza-
tion direction
After eliminating the false signals, the
false signal suppression must be de-
leted. Carry out a new false signal
suppression
Measured value jumps spo-
radically towards 100 %
during emptying
Level
time
0
Changing condensation or contamina-
tion on the antenna
Carry out false signal suppression or
increase false signal suppression in the
close range by editing
