UWT NivoGuide 8100, Инструкция по эксплуатации

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NivoGuide® 8100 • Two-wire 4 … 20 mA/HART
7 Diagnostics and servicing
58878-EN-190215
Fault description Cause Rectification
2. Measured value jumps
towards 100 %
Level
time 0
•
Due to the process, the amplitude of
the product echo decreases
•
A false signal suppression was not
carried out
•
Carry out a false signal suppression
•
Amplitude or position of a false signal
has changed (e.g. buildup); false sig-
nal suppression no longer matches
•
Determine the reason for the changed
false signals, carry out false signal
suppression, e.g. with buildup
Measurement error during filling
Fault description Cause Rectification
3. Measured value remains
in the area of the bottom
during filling
Level
time
0
•
Echo from the probe end larger than
the product echo, for example, with
products with ε
r
< 2.5 oil-based,
solvents, etc.
•
Check parameter "Medium" and "Ves-
sel height", adapt if necessary
4. Measured value remains
momentarily unchanged
during filling and then jumps
to the correct level
Level
time
0
•
Turbulence on the product surface,
quick filling
•
Check parameters, change if neces-
sary, e.g. in dosing vessel, reactor
5. Measured value jumps
sporadically to 100 % dur-
ing filling
Level
time
0
•
Changing condensation or contamina-
tion on the probe
•
Carry out a false signal suppression
6. 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 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 protection"
are output.
•
Eliminate false signals in the close
range
•
Check installation conditions
•
If possible, switch off the function
"Overfill protection"