7.6 False echo suppression
Evaluation modeThe factory setting is evaluation mode 0. It is strongly recommended that a customer
echo suppression map is recorded, see Chapter 6.1 and 6.2.
False echo suppressionThe customer has three possibilities of suppressing interference echoes.
Mode 2
When the tank is empty, the distance to the
product surface displayed in V0H8
corresponds to the true level. Echoes are
suppressed up to the proposed distance D
in V3H1.
•
D = (V0H8 – 0.8 m)
•
Corresponds to Procedure A, Chapter
6.3.
Mode 3
When the tank is empty, the distance to the
product surface displayed in V0H8 does
not correspond to the true level. By
confirming the proposed value in V3H1, the
false echoes are successively suppressed
until the true level is displayed.
•
D = (V0H8 + 0.3 m)
•
Corresponds to Procedure B,
Chapter 6.3.
Mode 4
The exact distance to the product surface
is known. Echoes up to the distance D
entered in V3H1 are suppressed.
•
D = (Distance to product – 0.8 m)
# VH Entry Significance
➤ Extended calibration
1 V3H0 4
H
Mode
2 V3H1 D m/ft
H
Suppression
distance
3 V3H1 1
VH
Customer map
(automatic)
Evaluation mode V3H0 Significance
0: Factory false echo
suppression map
Recorded at the fatory and is active across the entire measuring range.
Suppresses backround noise and matches the antenna to the device.
1: Customer false echo
suppression map
Recorded by the customer, preferably with an empty tank. Serves to suppress
false echoes and to match the Micropilot to the customer's tank.
D (V3H1)
V0H8
BA171Y55
V3H0 = 2
level echo
process connection
customer threshold
D (V3H1)
V0H8
BA171Y56
from here the
previous threshold
is used, e.g. factory
V3H0 = 3
false echo
suppressed
level echo
process connection
customer threshold
Recording mode V3H0 Significance
2 = up to Echo
(level echo)
Map recorded from process connection up to the measured echo. The device
assumes that the measured echo is the level echo, and does not suppress it.
3 = inclusive Echo
(false echo)
Map recorded from process connection up to and including the measured
echo. The device assumes that the measured echo is a false echo, and
suppresses it.
4 = up to suppression
distance
Map recorded from process connection up to the entered distance..
D
BA171Y56
V3H0 = 4
level echo
process connection
customer threshold
Micropilot FMR 231 Chapter 7 Trouble-Shooting
Endress+Hauser 41
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