42
13 Diagnostics and servicing
VEGAPULS Air 41 • Autarkic device with measured value transmission via radio technology
64808-EN-210426
Liquids: Measurement error at constant level
Fault description
Cause
Rectification
Measured value shows a too
low or too high level
Leve
l
time
0
Min./max. adjustment not correct
Adapt min./max. adjustment
Incorrect linearization curve
Adapt linearization curve
Measured value jumps to-
wards 100 %
Level
time
0
Due to the process, the amplitude of the
level echo sinks
A false signal suppression was not car-
ried out
Carry out a false signal suppression
Amplitude or position of a false signal
has changed (e.g. condensation, build-
up); false signal suppression no longer
matches actual conditions
Determine the reason for the changed
false signals, carry out false signal sup-
pression, e.g. with condensation.
Liquids: Measurement error during filling
Fault description
Cause
Rectification
Measured value remains un-
changed during filling
Level
time
0
False signals in the close range too big
or level echo too small
Strong foam or vortex generation
Max. adjustment not correct
Eliminate false signals in the close
range
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
Create a new false signal suppression
Adapt max. adjustment
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
