User's Manual

7ML19985LY01 SITRANS LR560 (FF) – INSTRUCTION MANUAL Page 135
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B: Troubleshooting
Reading does not
change, but the level
does
SITRANS LR560 process-
ing wrong echo, i.e. vessel
wall, or structural member
• re-locate SITRANS LR560
• 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.) on page
100
Measurement is con-
sistently off by a con-
stant amount
• setting for Low
Calibration Point (2.3.5.1.)
not correct
• setting for Sensor Offset
(2.3.5.3.) not correct
• check distance from sensor
reference point to Low Calibration
Point (2.3.5.1.)
•check Sensor Offset (2.3.5.3.)
Screen blank
Power error • check nameplate rating against
voltage supply
• check power wiring or source
Reading erratic Echo confidence weak • refer to Confidence (2.4.7.1.)
•use Auto False Echo Suppression
(2.4.8.1.) and Auto False Echo
Suppression Range (2.4.8.2.)
• use foam deflector or stillpipe
Material filling • re-locate SITRANS LR560
Reading response
slow
Fill Rate/Min (2.3.6.2.) set-
ting is incorrect
• increase measurement response if
possible
Reads correctly but
occasionally reads
high when vessel is
not full
• detecting close range
echo
• build up near top of
vessel or nozzle
• nozzle problem
• 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.)
Level reading lower
than material level
• material is within Near
Range zone
• multiple echoes
processed
• decrease Near Range (2.4.1.):
minimum value depends on antenna
type
• raise SITRANS LR560
• ensure Algorithm (2.4.5.1.) is set to tF
(trueFirst echo)
• vessel near empty and
low dK material
•set Position Detect (2.4.5.2.) to Hybrid
• check the setting for CLEF Range
(2.4.5.4.)
Operation Troubleshooting (cont’d)
Symptom Cause Action