25
Hauser
Prosonic T - FMU 130, 131, 230, 231, 232
Other Possible Entries
Echo Quality
The quality of the ultrasonic echo is shown in matrix fields V0H8 and V0H9 via the
bargraph.
• Poor echo quality due to fumes, dust, internal fittings, foam, higher measuring distance
etc.:
• Smooth liquid surface does not affect the echo:
Positioning the Sensor
When mounting use the bargraph display for echo quality to determine the correct
installation point.
Internal fittings which intrude too far into the measuring zone of the sensor reflect the
ultrasonic echo. Interfering signals can be eliminated by selecting a different sensor
position or activating the fixed target suppression function.
Fixed Target Echo Suppression
The fixed target suppression function is used when the level echo is not detected because
a fitting is generating a stronger interference echo. Up to three interference echoes can
be suppressed. The suppression should be activated with the tank as empty as possible.
V H
V H
Distance
Echo
3.9’
9.8’
Working
echo
Max. 3
interference
echoes
Step 1
Step 3
#
VH
Entry
Text
1
V0H8
Determine the measuring distance
(e.g. 1.2 m /3.9 ft.) and check echo
quality
Wait until a stable value is displayed
2
V3H0
e.g. 3
H
Known distance
from the surface
of material (e.g.
3 m /9.8 ft.)
2-wire instruments: wait approx. 40 s
3
V0H8
Measuring distance approx. 9.8 ft.?
YES - suppression completed
NO - repeat procedure
