Vega VEGAPULS C 21, Руководство по эксплуатации

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10 Diagnostics and servicing
VEGAPULS C 21 • SDI-12
58342-EN-200121
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 po-
sition (jumps to multiple echo)
In case of interferences due to instal-
lations in the close range: Change
polarisation direction
Chose a more suitable installation po-
sition
Measured value jumps to-
wards 100 % during filling
Level
time 0
Due to strong turbulence and foam gen-
eration during filling, the amplitude of
the level echo sinks. Measured value
jumps to false signal
Carry out a false signal suppression
Measured value jumps spo-
radically to 100 % during
filling
Level
time 0
Varying condensation or contamination
on the antenna
Carry out a false signal suppression
or increase false signal suppression
with condensation/contamination in the
close range by editing
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 genera-
tion or false signals in the close range.
The sensor goes into overfill protection
mode. The max. level (0 m distance) as
well as the status message "Overfill pro-
tection" are output.
Check measuring point: Antenna should
protrude out of the threaded mounting
socket, possible false echoes through
flange socket?
Remove contamination on the antenna
Liquids: Measurement error during emptying
Fault description Cause Rectification
Measured value remains un-
changed in the close range
during emptying
Level
time
0
False signal larger than the level echo
Level echo too small Check measuring point: Antenna should
protrude out of the threaded mounting
socket, possible false echoes through
flange socket?
Remove contamination on the antenna
In case of interferences due to instal-
lations in the close range: Change
polarisation 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
Varying condensation or contamination
on the antenna
Carry out false signal suppression or in-
crease false signal suppression in the
close range by editing
With bulk solids, use radar sensor with
purging air connection