Figure 7-30: Identifying the Hold Off Distance/UNZ in the Echo Curve Plot
A. Amplitude, mV
B. Distance, m
C. Hold Off Distance/UNZ
D. Disturbance
E. Surface peak
F. Surface Threshold
2. Set the Hold Off Distance/UNZ to the desired value.
a) Select Setup → Tank.
a) Select the Probe tab.
b) In the Hold Off Distance/UNZ box, type the desired value.
c) Select Store.
Set the hold off distance/upper null zone using a handheld
communicator
Prerequisites
Note
By adjusting the Hold Off Distance/UNZ, the measuring range is reduced.
Note
Before changing the Hold Off Distance/UNZ, check entered value for the high alarm limit.
The high alarm limit must be outside the Hold Off Distance/UNZ.
Procedure
1. Use the Echo Curve plot to verify if there are disturbances in the upper part of the
tank.
Reference Manual Service and troubleshooting
00809-0100-4530 April 2019
Reference Manual 229
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