Siemens SITRANS L Operating Instructions Manual page 51

Diagnostics and troubleshooting
10.5 Treatment of measurement errors
Measured value remains
unchanged in the close
range during emptying
Measured value jumps
sporadically towards
100 % during emptying
Measured value fluctuates
around 10 ... 20 %
44
Fault description
Fault description
False signal greater than level echo
or level echo too small
Changing condensation or
contamination on the antenna
Various echoes from an uneven
medium surface, e.g. an extraction
funnel
Reflections from the medium
surface via the vessel wall
(deflection)
Cause
Cause
Eliminate false signals in the close
range. Check: Antenna must
protrude out of the nozzle
Remove contamination on the
antenna
Minimize interfering installations
in the close range by changing the
polarization direction
After eliminating the false signals,
the auto false echo suppression
must be deleted. Carry out a new
auto false echo suppression
Carry out auto false echo
suppression or increase auto false
echo suppression in the close range
by editing
Check parameter "Material Type"
and adapt, if necessary
Optimize installation position and
transmitter orientation
Rectification
Rectification
SITRANS LR120, HART
Operating Instructions, 10/2023, A5E49829026