VEGA VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - two-wire, approval according to LPR radio standard - Manual (Page 61)

Fault description Error pattern Cause Rectification
3. Measured value
jumps towards 100 %
Level
time 0
l Due to the process, the amp-
litude of the product echo sinks
l A false signal suppression was
not carried out
l Carry out false signal suppres-
sion
l Amplitude or position of a false
echo has changed (e.g. con-
densation, buildup); false sig-
nal suppression no longer
matches
l Determine the reason for the
changed false echoes, carry
out false signal suppression, e.
g. with condensation
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
VEGAPULS 62 • 4 … 20 mA/HART - two-wire, approval according to LPR radio standard 61
9 Diagnosis, Asset Management and service
41718
-EN
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