Related information
6.5.2
Handling disturbances at the top of the tank
Adjust the near zone threshold
The Near Zone Threshold is used to filter out disturbing echoes and noises at the top of the
tank. By default, this threshold is automatically calculated by the device, and is sufficient in
most conditions.
However, in the case of unfavorable conditions, you might need to manually set the Near
Zone Threshold. This may, for example, be the case if a Single Lead probe is mounted in a
narrow nozzle, if the end of the nozzle protrudes into the tank, or if there are disturbing
obstacles in the Near Zone (referred to as the region between 0-3.3 ft. (0-1 m) below the
Upper Reference Point.
Figure 6-12: Near Zone Threshold
$
'
(
%
&
A. Reference Peak
B. Disturbance
C. Product Surface Peak
D. Near Zone Threshold blocking the disturbance
E. Surface Threshold
Service and troubleshooting
Reference Manual
February 2020
00809-0100-4308
130
Rosemount 3308 Series
Summary of Contents for Rosemount 3308A
Page 8: ...Contents Reference Manual February 2020 00809 0100 4308 viii Rosemount 3308 Series ...
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Page 22: ...Transmitter overview Reference Manual February 2020 00809 0100 4308 22 Rosemount 3308 Series ...
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Page 96: ...Configuration Reference Manual February 2020 00809 0100 4308 96 Rosemount 3308 Series ...