Emerson Rosemount 1208C Reference Manual page 52

Service and troubleshooting
March 2023
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
Change the upper null zone
52
A
C
D
Check the setting of the Upper Null Zone.
B
Rosemount 1208C Level and Flow Transmitter
Reference Manual
00809-0200-7062