User's Manual

Parameter reference
SITRANS LR250 (HART)
Operating Instructions, 01/2014, A5E32220602-AB
133
Echo Select (2.8.4.)
Algorithm (2.8.4.1.)
Selects the algorithm to be applied to the echo profile to extract the true echo.
Options
*
tF
True First echo
L
Largest echo
BLF
Best of Largest and First echo
Position Detect (2.8.4.2.)
Defines where on the echo the distance measurement is determined.
Options
Center
*
Hybrid (Center and CLEF)
CLEF (Constrained Leading Edge Fit)
Related parameters
CLEF Range (2.8.4.4.)
If the vessel bottom is being reported as the level instead of the actual material level (at low level
conditions), or if the dielectric constant of the liquid to be monitored is less than 3, we
recommend setting Position Detect to Hybrid and
CLEF Range (2.8.4.4.)
to 0.5 m (1.64 ft).
Echo Threshold (2.8.4.3.)
Sets the minimum echo confidence that the echo must meet in order to prevent a Loss of Echo
condition and the expiration of the Fail-safe (LOE) timer. When
Confidence (2.8.6.1.)
exceeds
Echo Threshold (2.8.4.3.)
, the echo is accepted as a valid echo and is evaluated.
Values
Range: 0 to 99
Default: 5
Related Parameters
LOE Timer (2.5.2.)