LUC-M** with HART/4 mA ... 20 mA and PROFIBUS PA
Signal evaluation
D
O
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2010
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14.3
Floating Average Curve (FAC)
The function of the Floating Average Curve (FAC) is similar to the interference echo
suppression.
The main difference is, that the tank map is recorded only once whilst the FAC adjusts
itself continuously to the changing measuring conditions.
By this procedure changes of the interference echoes (e. g. by build-up) can be
compensated for.
In contrast to the tank map, the FAC can only register small interference echoes.
The FAC is always used in the signal evaluation, even if the tank map has been
deactivated.
In the envelope curve, the maximum with the largest distance to the FAC is interpreted
as the level echo.
Echoes
The echo
w
ith the greatest distance
to the FAC
w
ill
b
e e
v
al
u
ated.
0
20
40
60
8
0
100
120
[dB]
[m]
FAC
En
v
elope c
u
r
v
e
w
ith reflections/echoes in the tank
Summary of Contents for LUC-M Series
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