LUC-M** with HART/4 mA ... 20 mA and PROFIBUS PA
Signal evaluation
D
O
C
T
-08
43A
01/
2010
1855
72
63
14.2
Interference echo suppression (tank mapping)
The interference echo suppression of the LUC-M** makes sure that interference echoes
are not interpreted as the level echo by fault.
In order to carry out the interference echo suppression one must record a time-of-flight
dependent threshold (TDT), which is also called the
tank map
. All maxima of the
envelope curve which are situated below the TDT are discarded by the signal evaluation
procedures.
It is recommended to record the tank map when the vessel is as possible empty. Then,
the map will include all echoes except the level echo.
But even, if it is not possible to empty the vessel during the commissioning of the
LUC-M**, you should perform the map. In this case it is recommended to repeat the
record of the mapping at a later time – when the vessel is as possible empty.
The tank map is recorded in the function group
"extended calibration" (05)
. Select the
option
"mapping"
in the
"selection" (050)
function.
C
u
stomer tank map
operation in
and "extented cali
b
ration"
"
b
asic set
u
p"
En
v
elope c
u
r
v
e
w
ith reflections/echoes in the tank
Interference echoes
Le
v
el echo
[dB]
[m]
0
20
40
60
8
0
100
120
Summary of Contents for LUC-M Series
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