User's Manual

Page 94 SITRANS LR260 (HART) – OPERATING INSTRUCTIONS A5E32337683
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B: Troubleshooting
Reading does not
change, but the level
does
SITRANS LR260 process-
ing wrong echo, i.e. vessel
wall, or structural member
• re-locate SITRANS LR260
• ensure nozzle protrudes 10 mm min.
• rotate instrument 90°. See
Orientation in a vessel with
obstructions on page 15.
•use
2.2.5.2. Auto False Echo
Suppression and 2.2.5.3. Auto
Suppression Range
Measurement is con-
sistently off by a con-
stant amount
• setting for 2.2.1.6. Low
Calibration Pt. (LOW
CALIB. PT.)
not correct
• setting for
2.2.1.25.
Sensor Offset
not correct
• check distance from sensor
reference point to 2.2.1.6. Low
Calibration Pt. (LOW CALIB. PT.)
• check 2.2.1.25. Sensor Offset
Screen blank
power error • check nameplate 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 2.2.4.5.1. Echo Confidence
•use 2.2.5.2. Auto False Echo
Suppression and 2.2.5.3. Auto
Suppression Range
• use foam deflector or stillpipe
material filling • re-locate SITRANS LR260
Reading response
slow
2.2.7.2. Fill Rate (FILL RATE/
MIN)
setting 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
• clean the antenna
•use
2.2.5.2. Auto False Echo
Suppression and 2.2.5.3. Auto
Suppression Range
Level reading lower
than material level
• material is within Near
Range zone
• multiple echoes
processed
• decrease
2.2.1.12. Near Range
(minimum value depends on
antenna type)
• raise SITRANS LR260
•ensure
2.2.4.1.1. Algorithm is set to F
(First echo)
Symptom Cause Action (Continued)