Vega VEGAPULS WL 61 Operating instructions manual - page 30
30
7 Diagnosis, asset management and service
VEGAPULS WL 61 • Profibus PA
38062-EN-140801
Fault description
Error pattern
Cause
Rectification
7. Measured value
jumps towards 0 %
during filling
Level
time
0
– Amplitude of a multiple echo
(vessel top - product surface) is
larger than the level echo
– Check parameter "Application",
especially vessel top, type
of medium, dished end, high
dielectric constant, adapt if
necessary
– The level echo cannot be distin-
guished from the false echo at
a false echo position (jumps to
multiple echo)
– In case of interferences due to
installations in the close range:
Change polarisation direction
– Chose a more suitable installa-
tion position
8. Measured value
jumps towards 100 %
during filling
Level
time
0
– Due to strong turbulence and
foam generation during filling,
the amplitude of the level echo
sinks. Measured value jumps to
the false echo
– Carry out a false signal sup-
pression
9. Measured value
jumps sporadically to
100 % during filling
Level
time
0
– Varying condensation or con-
tamination on the antenna
– Carry out a false signal sup-
pression or increase false
signal suppression with con-
densation/contamination in the
close range by editing
10. Measured value
jumps to ≥ 100 % or
0 m distance
Leve
l
time
0
– Level echo is no longer
detected in the close range
due to foam generation or false
echoes in the close range. The
sensor goes into overfill protec-
tion mode. The max. level (0 m
distance) as well as the status
message "Overfill protection"
are outputted.
– Check measuring site: Antenna
must protrude out of the socket
– Remove contamination on the
antenna
– Use a sensor with a more suit-
able antenna
Measurement error during emptying
Fault description
Error pattern
Cause
Rectification
11. Measured value re-
mains unchanged in
the close range during
emptying
Level
time
0
– False echo larger than the level
echo
– Level echo too small
– Remove false echoes in the
close range. Check: Antenna
must protrude out of the socket
– Remove contamination on the
antenna
– In case of interferences due to
installations in the close range:
Change polarisation direction
– After removing the false ech-
oes, the false signal suppres-
sion must be deleted. Carry out
a new false signal suppression
12. Measured value
jumps towards 0 %
during emptying
Level
time
0
– Echo from the tank bottom
larger than the level echo, for
example, with products with
ε
r
– Check parameters Type of
medium, Vessel height and
Floor form, adapt if necessary