Endress+Hauser Levelflex FMP54 - Parametrization Errors

Diagnostics and troubleshooting Levelflex FMP51, FMP52, FMP54 FOUNDATION Fieldbus
124 Endress+Hauser
13.1.2 Parametrization errors
Parametrization errors for level measurements
Error Possible cause Remedial action
Measured value wrong If measured distance(Setup
→ Distance) matches the real
distance:
Calibration error
• Check and adjust the Empty
calibration parameter (→  161) if
necessary.
• Check and adjust the Full calibration
parameter (→  162) if necessary.
• Check and adjust linearization if
necessary (Linearization submenu
(→  189)).
If measured distance (Setup
→ Distance) does not match the real
distance:
An interference echo affects the
measurement.
Perform mapping (Confirm distance
parameter (→  169)).
No change of the measured
value when emptying/filling
the tank
An interference echo affects the
measurement.
Perform mapping (Confirm distance
parameter (→  169)).
Build-up at the probe. Clean the probe.
Error in the echo tracking Deactivate echo tracking: Expert
→ Sensor → Echo tracking → Evaluation
mode = History off).
The diagnostic message
Echo lost appears after
switching on the supply
voltage.
Echo threshold too high. Check the Medium group parameter
(→  160).
If necessary select a more detailed
setting in the Medium property
parameter (→  177).
Level echo suppressed. Delete mapping and record new
mapping curve if required (Record map
parameter (→  171)).
Device displays a level when
the tank is empty.
Incorrect probe length Carry out probe length correction
(Confirm probe length parameter
(→  203)).
Interference echo Carry out mapping over entire probe
while the tank is empty (Confirm
distance parameter (→  169)).
Wrong slope of the level in
the entire measuring range
Wrong tank type selected. Set Tank type parameter (→  160)
correctly.
Parametrization errors for interface measurements
Error Possible cause Remedial action
With the setting Tank level
= Fully floodedWhen, the
measured interface level
jumps to higher values during
draining operations.
The total level is detected outside the
upper blocking distance.
Increase blocking distance (Blocking
distance parameter (→  180)).
Set Tank level parameter (→  166) =
Partially filled.
With the setting Tank level
= Partially filled, the
measured total level jumps to
lower values during filling
operations.
The total level runs into the upper
blocking distance.
Decrease blocking distance (Blocking
distance parameter (→  180)).
Wrong slope of the measured
interface level
Wrong dielectric constant (DC value). Enter correct dielectric constant (DC
value) of the upper medium (DC value
parameter (→  167)).
The measured values for the
interface and the total level
are identical
Echo threshold for the total level too
high due to a wrong dielectric
constant.
Enter correct dielectric constant (DC
value) of the upper medium (DC value
parameter (→  167)).