Vega VEGAPULS 64 Operating Instructions Manual page 61

Fault description
7. Measured value
jumps towards 0 %
during filling
8. Measured value
jumps towards 100 %
during filling
9. Measured value
jumps sporadically to
100 % during filling
10. Measured value
jumps to ≥ 100 % or
0 m distance
Measurement error during emptying
Fault description
11. Measured value re-
mains unchanged in
the close range during
emptying
12. Measured value
jumps towards 0 %
during emptying
VEGAPULS 64 • HART and accumulator pack
Error pattern Cause
•
Amplitude of a multiple echo
(vessel top - product surface) is
larger than the level echo
0 time
•
The level echo cannot be distin-
guished from the false signal at
a false signal position (jumps to
multiple echo)
•
Due to strong turbulence and
foam generation during filling,
the amplitude of the level echo
sinks. Measured value jumps to
false signal
0
time
•
Varying condensation or con-
tamination on the antenna
0 time
•
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 overfill protec-
0 time
tion mode. The max. level (0 m
distance) as well as the status
message "Overfill protection"
are outputted.
Error pattern Cause
•
False signal larger than the level
echo
•
Level echo too small
0
time
•
Echo from the tank bottom
larger than the level echo, for
example, with products with
ε < 2.5 oil-based, solvents
r
0
time
9 Diagnosis, asset management and service
Rectification
•
Check parameter "Application",
especially vessel top, type of
medium, dished bottom, high
dielectric constant, and adapt if
necessary
•
In case of interferences due to
installations in the close range:
Change polarisation direction
•
Chose a more suitable installa-
tion position
•
Carry out a false signal suppres-
sion
•
Carry out a false signal suppres-
sion or increase false signal
suppression with condensation/
contamination in the close
range by editing
•
Check measuring site: Antenna
must protrude out of the socket
•
Remove contamination on the
antenna
•
Use a sensor with a more suit-
able antenna
Rectification
•
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
•
Check parameters Medium
type, Vessel height and Floor
form, adapt if necessary
61