May 2016
Reference Manual
00809-0100-4530, Rev DD
300
C.3
Handling of disturbances from nozzle
C.3.1
Use the Trim Near Zone function
The Trim Near Zone function fine tunes performance in the area close to the tank top (Near
Zone). The Near Zone stretches about 40 in. (1 m) into the tank from the lower side of the
device flange.
The device will learn how the echo curve in the Near Zone looks like and use this for
enhancing accuracy when the surface echo is within the Near Zone. When leaving factory,
the near zone measurement has been fine tuned. The factory setting is normally sufficient
and does not need to be repeated after installation.
However, since the setting is optimized depending on actual installation, further trimming
may be necessary in the case of unfavorable conditions (for instance if there are disturbance
echoes caused by the tank nozzle, or if you have exchanged the probe). Trimming means
that the measurement performance in the Near Zone is maintained even under these
conditions and prevents false echo indication.
Note
The Trim Near Zone function should only be used for reducing impact from stationary
disturbances. It is not suitable for occasional disturbances.
Figure C-2. Echo Curve before and after Trim Near Zone
Note
For firmware version 2.A2 or later the Trim Near Zone is not possible in combination with
Narrow Nozzles, as defined below:
50 mm < Nozzle height < 300 mm
Nozzle diameter < 2 in. for all single probes except 13 mm single rigid
Nozzle diameter < 3 in. for 13 mm single rigid
Trim Near Zone
Reference Peak
Reference Peak
0-40 in. (0-1 m)
Содержание 5300 Series
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