VEGA VEGAPULS 61 (≥ 2.0.0 - ≥ 4.0.0) Foundation Fieldbus Approval according to LPR radio standard - Manual (Page 60)

Measurement error during filling
Fault description Error pattern Cause Rectification
4. Measured value re-
mains unchanged du-
ring filling
Level
time 0
l False echoes in the close
range too big or product echo
too small
l Strong foam or spout genera-
tion
l Max. adjustment not correct
l Remove false echoes in the
close range
l Check measurement situation:
Antenna must protrude out of
the socket, installations
l Remove pollution on the an-
tenna
l Minimize interfering installa-
tions in the close range by
changing the polarization di-
rection
l Create a new false signal sup-
pression
l Adapt max. adjustment
5. Measured value re-
mains in the bottom
section during filling
Level
time 0
l The tank floor echo is larger
than the product echo, e.g.
with products with ε
r
< 2 .5 oil-
based, solvents
l Application parameter "Me-
dium", check Vessel height and
Floor form, adapt if necessary
6. Measured value re-
mains momentarily un-
changed during filling
and then jumps to the
correct level
Level
time 0
l Turbulence on the product
surface, quick filling
l Check application parameters,
change if necessary, e.g. in
dosing vessel, reactor
7. Measured value
jumps towards 0 % du-
ring filling
Level
time 0
l Amplitude of a multiple echo
(vessel top - product surface)
is larger than the level echo
l Check application, especially
Vessel top, Product type, Dis-
hed bottom, High dielectric
value, and adapt if necessary
l The level echo cannot be
distinguished from the false
echo at a false echo position
(jumps to multiple echo)
l Remove/reduce false echo:
minimize interfering installa-
tions by changing the polariza-
tion direction
l Chose a more suitable instal-
lation position
8. Measured value
jumps towards 100 %
during filling
Level
time 0
l Due to strong turbulence and
foam generation during filling,
the amplitude of the product
echo sinks. Measured value
jumps to the false echo
l Carry out false signal suppres-
sion
9. Measured value
jumps sporadically to
100 % during filling
Leve
l
time 0
l Varying condensation or con-
tamination on the antenna
l Carry out a false signal sup-
pression or increase false sig-
nal suppression with
condensation/contamination in
the close range by editing
60 VEGAPULS 61 • Approval according to LPR radio standard
9 Diagnosis, Asset Management and service
41716
-EN
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