Burkert Type 8136 - Manual (Page 56)

Fault description Error pattern Cause Rectification
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
Level
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
11. Measured value
remains unchanged in
the close range during
emptying
Level
time 0
l False echo larger than the
level echo
l Level echo too small
l Remove false echoes in the
close range. Check: Antenna
must protrude out of the socket
l Remove pollution on the an-
tenna
l Minimize interfering installa-
tions in the close range by
changing the polarization di-
rection
l After removing the false ech-
oes, the false signal suppres-
sion must be deleted. Carry out
a new false signal suppression
12. Measured value
jumps towards 0 %
during emptying
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 type", check Vessel
height and Floor form, adapt if
necessary
13. Measured value
jumps sporadically to-
wards 100 % during
emptying
Level
time 0
l Varying condensation or con-
tamination on the antenna
l Carry out false signal suppres-
sion or increase false signal
suppression in the close range
by editing
l With bulk solids use radar
sensor with purging air con-
nection
56 LEVEL TRANSMITTER 8136 • 4 … 20 mA/HART - two-wire
9 Diagnosis, Asset Management and service
41783
-EN
-120316