Siemens SITRANS LR260 Operating Instructions Manual page 124

Diagnosing and troubleshooting
10.4 Operation troubleshooting
Symptom
Display shows
Display shows
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 Fill Rate (2.2.7.2) (Page 90) set‐
Reads correctly but oc‐
casionally reads high
when vessel is not full
Level reading lower
than actual material
level
124
Cause
location or aiming:
● poor installation
● flange not level
antenna malfunction:
● temperature too high
● physical damage
SITRANS LR260 processing
wrong echo. For example, vessel
wall or structural member
● setting for Low Calibration Pt.
(2.2.1.6.) (Page 80) not
correct
● setting for Sensor Offset
(2.2.1.25.) (Page 82) not
correct
power error
too much load resistance
echo confidence weak
material filling
ting incorrect
● detecting close range echo
● build up near top of vessel or
nozzle
● nozzle problem
● material is within Near Range
zone
● multiple echoes processed
Action
● check to ensure nozzle is vertical
● use Auto False Echo Suppression (2.2.5.2 (Page 87)) and
check Auto Suppression Range (2.2.5.3) (Page 87) to
ensure nozzle protrudes from end of vessel nozzle.
● check Current Internal Temperature (3.14.1) (Page 96)
● relocate
● re-locate SITRANS LR260
● ensure nozzle protrudes 10 mm min.
● rotate device 90°. See Orientation in a vessel with
obstructions (Page 27).
● use Auto False Echo Suppression (2.2.5.2.) (Page 87)
and Auto Suppression Range (2.2.5.3.) (Page 87)
● check distance from sensor reference point to Low
Calibration Pt. (2.2.1.6.) (Page 80)
● check Sensor Offset (2.2.1.25.) (Page 82)
● check nameplate rating against voltage supply
● check power wiring or source
● remove something from the loop, or
● increase supply voltage
● refer to Echo Confidence (2.2.4.5.1.) (Page 86)
● use Auto False Echo Suppression (2.2.5.2.) (Page 87)and
Auto False Echo Suppression Range (2.2.5.3.) (Page 87)
● use foam deflector or stillpipe
● Re-locate SITRANS LR260
● increase measurement response if possible
● clean the antenna
● use Auto False Echo Suppression (2.2.5.2.) (Page 87)and
Auto Suppression Range (2.2.5.3.) (Page 87)
● decrease Near Range (2.2.1.12.) (Page 81) (minimum
value depends on antenna type)
● raise SITRANS LR260
● ensure Algorithm (2.2.4.1.1.) (Page 82)is set to F (First
echo)
Operating Instructions, 11/2019, A5E32337683-AD
SITRANS LR260 with mA/HART