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Table 7-6: Incorrect Level Readings
(continued)
Symptom
Possible causes
Recommended actions
Level is stuck in full tank.
Level
Time
Disturbing objects near the
antenna.
•
Use the suppress false echoes function
to manage strong disturbance echoes,
see
.
•
Analyze the echo curve and check
amplitude thresholds, see
.
•
For process seal antenna installed in a
nozzle taller than 10-in. (25 cm), adjust
the pre-configured amplitude
threshold, see
.
•
Increase the Upper Null Zone, see
Handling disturbances at top of tank
•
Remove the disturbing object.
•
Move the transmitter to another
position. Refer to
for installation
considerations.
Product build-up on the
antenna.
•
Clean the antenna.
•
Use transmitter with air purging
connection.
Cone antenna does not
extend below the nozzle.
Use the extended cone antenna.
Level value drops to a lower value when
product surface is close to antenna.
Level
Time
Product surface is within the
Upper Null Zone and a
disturbance echo is
interpreted as the product
surface.
Check the setting of the Upper Null Zone,
see
Reference Manual
Service and troubleshooting
00809-0100-4408
February 2020
Rosemount 5408 and 5408:SIS Level Transmitters
109
Содержание Rosemount 5408
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