Emerson Rosemount 3408 Reference Manual page 73

Reference Manual
00809-0100-4418
Level value drops when close to antenna
Symptom
Level value drops to a lower value when product surface is close to antenna.
Figure 7-4: Symptom
A. Level
B. Time
C. Actual level
D. Reported level
Possible cause
Product surface is within the Upper Null Zone and a disturbance echo is interpreted as the
product surface.
Recommended actions
•
Related information
Upper null zone
Rosemount 3408 Level Transmitter
A
C
D
Check the setting of the Upper Null Zone.
Service and troubleshooting
B
September 2022
73