Parametrization Errors - Endress+Hauser Levelflex FMP55 Operating Instructions Manual

Diagnostics and troubleshooting
78
12.1.2

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
Wrong slope of the measured
interface level
The measured values for the
interface and the total level
are identical
If the interface layers are
thin, the total level jumps to
the interface level.
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
Wrong dielectric constant (DC value). Enter the correct dielectric constant (DC
Echo threshold for the total level too
high due to a wrong dielectric
constant.
The thickness of the upper medium
is less than 60 mm (2.4 in).
Levelflex FMP55 HART
Remedial action
• Check and adjust the Empty
calibration parameter (→  113) if
necessary.
• Check and adjust the Full calibration
parameter (→  114) if necessary.
• Check and adjust linearization if
necessary (Linearization submenu
(→  132)).
Perform mapping (Confirm distance
parameter (→  118)).
Perform mapping (Confirm distance
parameter (→  118)).
Clean the probe.
Deactivate echo tracking: Expert
→ Sensor → Echo tracking → Evaluation
mode = History off).
Check the Medium group parameter
(→  113).
If necessary select a more detailed
setting in the Medium property
parameter.
Delete mapping and record new
mapping curve if required (Record map
parameter (→  120)).
Carry out probe length correction
(Confirm probe length parameter
(→  148)).
Carry out mapping over entire probe
while the tank is empty (Confirm
distance parameter (→  118)).
Set Tank type parameter (→  112)
correctly.
Remedial action
value) of the upper medium (DC value
parameter (→  116)).
Enter the correct dielectric constant (DC
value) of the upper medium (DC value
parameter (→  116)).
Interface measurement is only possible
if the thickness of the interface is
greater than 60 mm (2.4 in).
Endress+Hauser