
103
Reference Manual
00809-0100-4811, Rev DA
Section 6: Service and Troubleshooting
January 2015
Service and Troubleshooting
If there are measurement problems in the upper part of the tank, you can use the TNZ function
as described above.
If the desired measurement range is below the near zone, or if disturbing objects are located
below the near zone, the UNZ parameter can be used to avoid measurements above a certain
level.
To set the UNZ, do one of the following:
1. Select the HART command [1, 3, 3, 1].
2. Enter the desired value,
or
1. Start the Radar Configuration Tool (RCT).
2. Select the Setup icon in the RCT workspace project bar.
3. Select the Probe tab in the Setup window.
4. Select the Receive Page button.
5. Type the desired value in the Upper Null Zone field.
6. Select the Send Page button. Now the UNZ is stored in the transmitter memory.
Figure 6-8. Upper Null Zone
Figure 6-9. Identifying the UNZ in the RCT Waveform Plot
Reference gauge height
Upper Null Zone
Product level
Upper reference point
--
Upper Null Zone
Disturbance
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