Siemens SITRANS LR250 Instruction Manual page 106

Symptom
Reading does
not change, but
the level does
Measurement is
consistently off
by a constant
amount
Screen blank
Reading erratic
Reading
response slow
Page 102 SITRANS LR250 (HART) – INSTRUCTION MANUAL
Cause
SITRANS LR250 processing
wrong echo, i.e. vessel wall, or
structural member
2.2.1.6. Low
• setting for
Calibration Pt.
not correct
2.2.1.15. Level
• setting for
Offset
not correct
power error
too much load resistance
echo confidence weak
liquid surface vortexed
material filling
2.2.7.1. Response Rate
incorrect
Action (cont' d )
• re-locate SITRANS LR250
• check nozzle for internal burrs
or welds
• rotate instrument 90°
2.2.5.6. Auto False Echo
• use
Suppression
Range (Auto Suppression
Range)
• check distance from flange
face to
Pt.
2.2. 1 . 1 5. Level Offset
• check
device tag
• check nameplate rating
against voltage supply
• check power wiring or source
• change barrier type, or
• remove something from the
loop, or
• increase supply voltage
• refer to
2.2.5.6. Auto False Echo
• use
Suppression
Range (Auto Suppression
Range)
• use foam deflector or stilling
well
• decrease
Rate
• relocate instrument to side
pipe
• increase confidence threshold
2.2.4. 1 .3. Echo Threshold
in
• re-locate SITRANS LR250
• increase measurement
setting
response if possible
2.2.5.7.
and
2.2.1.6. Low Calibration
or
2.2.4.5. 1 . Confidence
2.2.5.7.
and
2.2.7.1. Response
7ML19985JE01