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OPERATION TROUBLESHOOTING
Operating symptoms, probable causes, and resolutions.
Display/Symptom
S:0 LOE
S: 0 LOE
S: 0 LOE
S: 0 LOE
Reading does not
change, but the level
does
Measurement is
consistently
off by a constant amount
Screen blank
Reading erratic
Reading response
slow
Reads correctly but
occasionally reads high
when vessel is not full
MPR180416 Rev. B
Cause
Level or target is out of range
Material build-up on antenna
Location or aiming:
• poor installation
• flange not level
• Auto False Echo Suppression may be
incorrectly applied
Antenna malfunction:
• temperature too high
• physical damage
Unit processing wrong echo, i.e. vessel
wall, or structural member
• setting for Low Calibration Point
(2.3.5.1) not correct
• setting for Sensor Offset (2.3.5.3.) not
correct
Power error
Echo confidence weak
Material filling
Fill Rate/Min (2.3.6.2.) setting is
incorrect
• detecting close range echo
• build up near top of vessel or nozzle
• nozzle problem
Action
•
check specifications
•
check Low Calibration Point (2.3.5.1.)
•
use the air purge feature to clean the antenna
•
re-locate unit
•
check to ensure nozzle/standpipe is vertical
•
ensure the nozzel is not protruding into
antenna area
•
review Auto False Echo Suppression (2.4.8.1.)
•
ensure Auto Suppression Range is set
correctly
•
check temperature in Maximum Value (3.4.2.)
•
relocate unit
•
re-locate unit
•
check nozzle for internal burrs or welds
•
use Auto False Echo Suppression (2.4.8.1.) if
necessary: see Auto False Echo Suppression
(2.4.8.1.)
•
check distance from sensor reference point to
Low Calibration Point (2.3.5.1.)
•
check Sensor Offset (2.3.5.3.)
•
check nameplate rating against voltage
supply
•
check power wiring or source
•
refer to Confidence (2.4.7.1.)
•
use Auto False Echo Suppression (2.4.8.1.) and
Auto False EchoSuppression Range (2.4.8.2.)
•
use foam deflector or stillpipe
•
relocate unit
•
increase measurement response if possible
•
use the air purge feature to clean the antenna
•
use Auto False Echo Suppression (2.4.8.1.)
and Auto False Echo Suppression Range
(2.4.8.2.)
37
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