VEGA VEGAPULS 61 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - two-wire Approval according to LPR radio standard - Manual (Page 63)

Fault description Error pattern Cause Rectification
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
Level
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
10. Measured value
jumps to ≥ 100 % or 0 m
distance
Le
ve
l
time 0
l Level echo is no longer de-
tected in the close range due
to foam generation or false
echoes in the close range. The
sensor goes into overfill pro-
tection mode. The max. level
(0 m distance) as well as the
status message "Overfill pro-
tection" are outputted.
l Check measuring site: Antenna
must protrude out of the socket
l Remove pollution on the an-
tenna
l Use a sensor with a more
suitable antenna
Measurement error during emptying
Fault description Error pattern Cause Rectification
VEGAPULS 61 • Approval according to LPR radio standard 63
9 Diagnosis, Asset Management and service
41713
-EN
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