Siemens SITRANS LR250 Instruction Manual page 107

Symptom
Reads correctly
but occasionally
reads high
when vessel is
not full
Level reading
lower than
material level
7ML19985JE01
Cause
• detecting close range echo
• build up near top of vessel or
nozzle
• nozzle problem
• material is within near
blanking zone
• vessel near empty and low
ε material
r
• multiple echoes processed
• nozzle too narrow for length
SITRANS LR250 (HART) – INSTRUCTION MANUAL
Action (cont' d )
• clean the antenna
2.2.5.6. Auto False Echo
• use
Suppression 2.2.5.7.
and
Range (Auto Suppression
Range)
2.2. 1 .12. Near Range
• decrease
(minimum value depends on
antenna type)
• raise SITRANS LR250
2.2.4. 1 . 1 . Algorithm
• ensure
to F (First echo)
Rod Extension
• see
Requirements
on page 114.
is set
Page 103