Parametrization Errors - Endress+Hauser Levelflex FMP51 Operating Instructions Manual

Diagnostics and troubleshooting
90
12.1.2

Parametrization errors

Parametrization errors for level measurements
Problem
Measured value is incorrect
No change of measured value
on filling/emptying
Echo lost diagnostic
message appears after the
supply voltage is switched on.
Device displays a level when
the tank is empty.
Wrong slope of the level over
the entire measuring range
Parametrization errors for interface measurements
Problem
With the setting Tank level
= Fully flooded, the interface
level displayed jumps to
higher values when the tank
is emptied.
With the setting Tank level
= Partially filled, the total
level displayed jumps to
lower values when the tank is
filled.
Incorrect slope of the
interface measured value
The measured value for the
interface and the total level
are identical.
Levelflex FMP51, FMP52, FMP54 PROFIBUS PA
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 is present.
An interference echo is present.
Buildup 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 goes to the upper
blocking distance.
The dielectric constant (DC value) of
the upper medium is incorrectly set.
The echo threshold for the total level
is too high due to an incorrect
dielectric constant.
Remedy
• Check the Empty calibration
parameter (→  133) and correct if
necessary.
• Check the Full calibration parameter
(→  134) and correct if necessary.
• Check the linearization and correct if
necessary (Linearization submenu
(→  161)).
Carry out mapping (Confirm distance
parameter (→  141)).
Carry out mapping (Confirm distance
parameter (→  141)).
Clean the probe.
Deactivate echo tracking (Expert
→ Sensor → Echo tracking → Evaluation
mode = History off).
Check the Medium group parameter
(→  133).
If necessary, select a more detailed
setting with the Medium property
parameter (→  149).
Delete the map and record it again if
necessary (Record map parameter
(→  143)).
Perform probe length correction
(Confirm probe length parameter
(→  177)).
Carry out mapping over the entire probe
length when the tank is empty (Confirm
distance parameter (→  141)).
Select the correct Tank type parameter
(→  132).
Remedy
Increase the blocking distance (Blocking
distance parameter (→  152)).
Set Tank level parameter (→  138) =
Partially filled.
Reduce the blocking distance (Blocking
distance parameter (→  152)).
Enter the correct dielectric constant (DC
value) of the upper medium (DC value
parameter (→  139)).
Enter the correct dielectric constant (DC
value) of the upper medium (DC value
parameter (→  139)).
Endress+Hauser