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Reference Manual
00809-0600-4026, Rev BA
December 2011
Rosemount Process Radar
3-10
Step 5. Common
Problems and
Recommended Actions
Double Bounce
Tall, narrow, and/or rough nozzles may create double bounces, which disturb
the measurement signal. The double bounce always appears at twice the
disturbance distance.
Recommended Actions:
Verify that mounting considerations as described in the Rosemount
5300 Series Reference Manual (Document No. 00809-0100-4530)
section “Mounting Considerations“ are followed
Perform Trim Near Zone, see the Rosemount 5300 Series Reference
Manual (Document No. 00809-0100-4530) section “Trim Near Zone”
for activation details. Fine-tune performance by trimming echoes in the
near zone
Adjust Upper Null Zone (UNZ), see the Rosemount 5300 Series
Reference Manual (Document No. 00809-0100-4530) section
“Changing the Upper Null Zone” for details. Exclude any echo "before"
the UNZ
Adjust Surface Threshold (ATC), see the Rosemount 5300 Series
Reference Manual (Document No. 00809-0100-4530) section “Using
the Rosemount Radar Master” for details. Exclude any echo weaker
than the threshold
Strong fixed echo - Bent probe / Probe contacting Nozzle
A bent probe in contact with metal creates strong echo and measurement will
lock onto the strong echo. Note that contamination also may create strong
disturbance echoes.
Figure 3-11. Measurement data
using a bent probe
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