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Reference Manual
00809-0700-4530, Rev AA
Section 3: Commissioning
September 2013
Commissioning
Figure 3-1. Echo curve before and after TNZ
NOTE:
The effect of TNZ is only visible when an echo is present in the near zone.
3.3.2 Changing the Upper Null Zone (UNZ)
Measurements are not performed within the Upper Null Zone (UNZ). By setting the UNZ
parameter to zero, measurements can be performed in the region close to the flange (near
zone).
Figure 3-2. Upper Null Zone (UNZ)
If there are measurements desired in the upper part of the tank, use the Trim Near Zone
function to optimize the echo curve in that region, see “Trim Near Zone (GWR transmitters)” on
page 37. If the desired measurement range is below the near zone, or if disturbing objects are
located within the near zone, the UNZ parameter can be used to avoid false measurements
contained within the UNZ area.
Rosemount 5300, 5400, and 5600 Series
RRM > Tank > Probe > Upper Null Zone (enter desired value in field)
RRM > Echo Curve > Configuration Mode (Drag & Drop UNZ line)
TNZ
Upper reference point
Reference gauge height
Upper Null Zone (UNZ)
Product level