Siemens SITRANS LR560 Operating Instructions Manual page 141
Foundation fieldbus radar level transmitter
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Also See for SITRANS LR560:
- Quick start manual (270 pages) ,
- Operating instructions manual (222 pages) ,
- Compact operating instructions (66 pages)
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Symptom
Reading does not
change, but the level
does
Measurement is con-
sistently off by a con-
stant amount
Screen blank
Reading erratic
Reading response
slow
Reads correctly but
occasionally reads
high when vessel is
not full
Level reading lower
than material level
7ML19985LY01
Operation Troubleshooting (cont' d )
Cause
SITRANS LR560 process-
ing 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.) set-
ting is incorrect
• detecting close range
echo
• build up near top of
vessel or nozzle
• nozzle problem
• material is within Near
Range zone
• multiple echoes
processed
• vessel near empty and
low dK material
SITRANS LR560 (FF) – INSTRUCTION MANUAL
Action
• 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
• 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 Echo
Suppression Range (2.4.8.2.)
• use foam deflector or stillpipe
• re-locate SITRANS LR560
• 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.)
• 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)
• set Position Detect (2.4.5.2.) to Hybrid
• check the setting for CLEF Range
(2.4.5.4.)
Page 135
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