Page 114 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL 7ML19985JF02
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D: Technical Reference
Echo Threshold (2.2.3.1.2.)
Echo Confidence (2.2.3.6.1.) describes the quality of an echo. Higher values represent
higher quality. Echo Threshold defines the minimum confidence value required for an
echo to be accepted as valid and evaluated.
Echo Lock (2.2.3.2.1.)
If the echo selected by Algorithm is within the Echo Lock window, the window is centered
about the echo, which is used to derive the measurement. In radar applications, two
measurement verification options are used:
Lock Off
SITRANS LR 250 responds immediately to a new selected echo (within the restrictions
set by the Maximum Fill / Empty Rate), but measurement reliability is affected.
Material Agitator
A new measurement outside the Echo Lock Window must meet the sampling criteria
before the window will move to include it.
The other available options, Maximum Verification and Total Lock are not recommended
for radar.
Auto False Echo Suppression (2.2.4.2.)
Auto False Echo Suppression is designed to learn a specific environment (for example, a
particular vessel with known obstructions), and in conjunction with Auto Suppression
Range to remove false echoes appearing in front of the material echo.
Notes:
• For detailed instructions on using this feature via PDM see
Auto False Echo
Suppression
on page 44.
• For detailed instructions on using this feature via the handheld programmer see
Auto False Echo Suppression (2.2.4.2.) on page 64.
default TVT
vessel
bottom
echo
material
echo
echo
marker
CLEF enabled
Vessel height: 1.5 m; CLEF range set to 1 m
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