Emerson ROSEMOUNT 5300 Especificações descarregar pdf (Página 42)

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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Emerson ROSEMOUNT 5300 Especificações Página 42