Parametrization Errors - Endress+Hauser Levelflex FMP55 Operating Instructions Manual

Levelflex FMP55 PROFIBUS PA
Endress+Hauser
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
Incorrect slope of the
interface measured value
The measured value for the
interface and the total level
are identical.
The total level jumps to the
interface level in the case of
thin interfaces.
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 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.
The thickness of the upper medium
is lower than 60 mm.
Diagnostics and troubleshooting
Remedy
• Check the Empty calibration
parameter (→  102) and correct if
necessary.
• Check the Full calibration parameter
(→  103) and correct if necessary.
• Check the linearization and correct if
necessary (Linearization submenu
(→  123)).
Carry out mapping (Confirm distance
parameter (→  107)).
Carry out mapping (Confirm distance
parameter (→  107)).
Clean the probe.
Deactivate echo tracking (Expert
→ Sensor → Echo tracking → Evaluation
mode = History off).
Check the Medium group parameter
(→  102).
If necessary, select a more detailed
setting with the Medium property
parameter.
Delete the map and record it again if
necessary (Record map parameter
(→  109)).
Perform probe length correction
(Confirm probe length parameter
(→  139)).
Carry out mapping over the entire probe
length when the tank is empty (Confirm
distance parameter (→  107)).
Select the correct Tank type parameter
(→  101).
Remedy
Enter the correct dielectric constant (DC
value) of the upper medium (DC value
parameter (→  105)).
Enter the correct dielectric constant (DC
value) of the upper medium (DC value
parameter (→  105)).
Measurement of the interface is only
possible for interface heights greater
than 60 mm.
65