Parametrization Errors - Endress+Hauser Levelflex FMP51 Operating Instructions Manual

Diagnostics and troubleshooting
124
13.1.2

Parametrization errors

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