User's Manual

7ML19985JE03 SITRANS LR250 (HART) – INSTRUCTION MANUAL Page 123
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B: Troubleshooting
Display shows
S: 0 LOE
location or aiming:
• poor installation
• flange not level
• Auto False Echo Suppres-
sion may be incorrectly
applied
• check to ensure nozzle is vertical
• ensure end of antenna protrudes from
end of nozzle
•review
Auto False Echo Suppression
(2.8.7.1.)
on page 130
• ensure Auto False Echo Suppression
Range is set correctly
Display shows
S: 0 LOE
antenna malfunction:
• temperature too high
• physical damage
• excessive foam
• multiple echoes
• check Current Internal Temperature (3.2.1.)
• use foam deflector or stillpipe
• relocate
•use a defoamer
•set Algorithm (2.8.4.1.) to F (First echo)
Reading does not
change, but the level
does
SITRANS LR250 processing
wrong echo, for example, ves-
sel wall, or structural member
• re-locate SITRANS LR250
• check nozzle for internal burrs or welds
• rotate instrument 90°
•use Auto False Echo Suppression (2.8.7.1.)
if necessary: see
Auto False Echo Sup-
pression (2.8.7.1.)
on page 130
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 nameplate rating against voltage
supply
• check power wiring or source
too much load resistance
• change barrier type, or
• remove something from the loop, or
• increase supply voltage
Reading erratic
echo confidence weak
• refer to Confidence (2.8.6.1.)
•use Auto False Echo Suppression (2.8.7.1.)
and Auto False Echo Suppression Range
(2.8.7.2.)
• use foam deflector or stillpipe
liquid surface vortexed
• decrease Fill Rate (2.4.2.)
• relocate instrument to side pipe
• increase confidence threshold in Echo
Threshold (2.8.4.3.)
material filling • re-locate SITRANS LR250
Operation Troubleshooting (cont’d)
Symptom Cause Action