User's Manual

Page 120 SITRANS LR560 (mA/HART) – INSTRUCTION MANUAL 7ML19985KB01
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B: Troubleshooting
Display shows
S: 0 LOE
location or aiming:
• poor installation
• Auto False Echo Suppres-
sion may be incorrectly
applied
• ensure antenna has clear view of mate-
rial to be measured
• review “Shaper Mode (2.8.4.)” on
page 126
• ensure Auto False Echo Suppression
Range is set correctly
Display shows
S: 0 LOE
antenna malfunction:
• temperature too high
•physical damage
• Check for physical damage and replace
sensor if required.
Reading does not
change, but the level
does
SITRANS LR560 processing
wrong echo, for example, ves-
sel wall, or structural member
• re-locate SITRANS LR560
• check nozzle for internal burrs or welds
•use Shaper Mode (2.8.4.) if necessary:
see “Shaper Mode (2.8.4.)” on page 126
Measurement is consis-
tently off by a constant
amount
•setting for Low Calibration
Pt. (2.3.1.) not correct
•setting for Sensor Offset
(2.3.3.) not correct
• check distance from sensor reference
point to Low Calibration Pt. (2.3.1.)
•check Sensor Offset (2.3.3.)
Screen blank
power error
• check device label rating against voltage
supply
• check power wiring or source
too much load resistance
• remove something from the loop, or
• increase supply voltage
Reading erratic
echo confidence weak
•refer to Confidence (2.7.6.1.)
•use Shaper Mode (2.8.4.) and Shaper
Mode (2.8.4.)
material filling • re-locate SITRANS LR560
Reading response slow
Fill Rate/Min (2.4.2.) setting
incorrect
• increase measurement response if possi-
ble
Reads correctly but occa-
sionally 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 Shaper Mode (2.8.4.) and Shaper
Mode (2.8.4.)
Level reading lower than
actual material level
• material is within Near
Range zone
• multiple echoes
processed
• decrease Near Range (2.7.1.) (minimum
value depends on antenna type)
• raise SITRANS LR560
• ensure Algorithm (2.7.3.1.) is set to F (First
echo)
• vessel near empty and
low dK material
•set CLEF Range (2.7.3.4.) to 0.5 m
Operation Troubleshooting (Continued)
Symptom Cause Action