50
11 Diagnostics and servicing
VEGAPULS 31 • Two-wire 4 … 20 mA/HART
57820-EN-191014
Fault description
Cause
Rectification
Measured value fluctuates
around 10 … 20 %
Level
time
0
Various echoes from an uneven product
surface, e.g. a material cone
Check parameter "Type of medium" and
adapt, if necessary
Optimize installation position and sen-
sor orientation
Reflections from the product surface via
the vessel wall (deflection)
Select a more suitable installation po-
sition, optimize sensor orientation, e.g.
with a swivelling holder
Measured value jumps spo-
radically to 100 % during
filling
Level
time
0
Changing condensation or contamina-
tion on the antenna
Carry out a false signal suppression
or increase false signal suppression
with condensation/contamination in the
close range by editing
Bulk solids: Measurement error during emptying
Fault description
Cause
Rectification
Measured value remains un-
changed in the close range
during emptying
Level
time
0
False signal greater than level echo or
level echo too small
Eliminate false signals in the close
range. Check: Antenna must protrude
out of the socket
Remove contamination on the antenna
Minimize interfering installations in the
close range by changing the polariza-
tion 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
Changing condensation or contamina-
tion on the antenna
Carry out false signal suppression or in-
crease false signal suppression in the
close range by editing
Measured value fluctuates
around 10 … 20 %
Level
time
0
Various echoes from an uneven product
surface, e.g. an extraction funnel
Check parameter "Type of medium" and
adapt, if necessary
Reflections from the product surface via
the vessel wall (deflection)
Optimize installation position and sen-
sor orientation
11.6 Software update
The device software can be updated in the following ways:
•
HART signal
•
Bluetooth
The following components are required: