Vega VEGAPULS 63 - 9 Measurement Errors: Filling; Errors During Filling Process

68
9 Diagnosis, asset management and service
VEGAPULS 63 • Modbus and Levelmaster protocol
41364-EN-170711
Fault description Error pattern Reason Rectication
6. Measured value re-
mains momentarily
unchangedduringll-
ing and then jumps to
the correct level
Level
time
0
•
Turbulence on the product
surface,quicklling
•
Check parameters, change if
necessary, e.g. in dosing vessel,
reactor
7. Measured value
jumps towards 0 %
duringlling
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 bottom, high
dielectric constant, and adapt if
necessary
•
The level echo cannot be distin-
guished from the false signal at
a false signal 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lling
Level
time
0
•
Due to strong turbulence and
foamgenerationduringlling,
the amplitude of the level echo
sinks. Measured value jumps to
false signal
•
Carry out a false signal suppres-
sion
9. Measured value
jumps sporadically to
100%duringlling
Level
time
0
•
Varying condensation or con-
tamination on the antenna
•
Carry out a false signal suppres-
sion or increase false signal
suppression with condensation/
contamination in the close
range by editing
10. Measured value
jumpsto≥100%or
0 m distance
Level
time
0
•
Level echo is no longer
detected in the close range
due to foam generation or false
signals in the close range. The
sensorgoesintooverllprotec-
tion mode. The max. level (0 m
distance) as well as the status
message"Overll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 Reason Rectication
11. Measured value re-
mains unchanged in
the close range during
emptying
Level
time
0
•
False signal larger than the level
echo
•
Level echo too small
•
Eliminate false signal in the
close range. Check: Antenna
must protrude from the socket
•
Remove contamination on the
antenna
•
In case of interferences due to
installations in the close range:
Change polarisation direction
•
After eliminating the false sig-
nals, the false signal suppres-
sion must be deleted. Carry out
a new false signal suppression