Emerson Rosemount 5408, Reference Manual

Page: 266 / 274

Upper null zone
The Upper Null Zone defines how close to the transmitter's reference point a level value is
accepted. You can extend this value to block out disturbing echoes close to the antenna,
for example from the tank nozzle or bypass well inlet.
Note
Make sure the 20 mA value is below the Upper Null Zone. Measurements are not
performed within the Upper Null Zone (UNZ).
Related information
Change the upper null zone
C.3.6 Advanced
Calibration offset
Difference between surface distance measured by transmitter and the same distance
measured by, for example, hand-dipping with a measurement tape. A positive Calibration
Offset value will increase the presented level value.
It is recommended to run the Verify Level tool to match the product level reported by the
transmitter to a reference measurement.
Related information
Verify level
User defined variable setup
This section applies only to transmitters ordered with Smart Diagnostics Suite (option
code DA1).
Name
Name of the user defined variable. It is recommended to enter a short name to fit into the
LCD display area.
Input register
Enter the number of the input register that contains value of the user defined variable. See
Table C-5 for a list of suitable input registers.
The default value is 20210 (Distance).
Configuration parameters Reference Manual
February 2020 00809-0100-4408
266 Reference Manual