Emerson Rosemount 3308A Reference Manual page 181

3308 series wireless guided wave radar
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Reference Manual
00809-0100-4308, Rev CA
Note
Measurements are not performed within the Upper Null Zone. and level alerts located in the Upper Null
Zone will not be triggered. Always configure your level alerts below the Upper Null Zone.
For narrow nozzles it may be necessary to increase the Upper Null Zone (UNZ) in order to reduce the
measuring range in the upper part of the tank.
Figure D-4. Upper Null Zone
A
A. UNZ
B.
Nozzle height
By setting the UNZ equal to the nozzle height, the impact on the measurement due to interfering echoes
from the nozzle will be reduced.
See also section
adjustments may also be needed in this case.
Probe angle (only applicable to rigid probes)
Defines the angle compared to the plumb line at which the device with probe is mounted (0 means that
probe is mounted vertically).
Enter the angle between the probe and the vertical line. Do not change this value if the transmitter is
mounted with the probe along the vertical line (which is normally the case).
Configuration Parameters
PRELIMINARY
B
"Handling disturbances at the top of the tank" on page
Configuration Parameters
August 2017
102. Amplitude Threshold
169

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