Siemens SITRANS L Operating Instructions Manual page 133

Shots (2.5.6.)
The number of echo profile samples averaged to produce a measurement.
Values
To meet accuracy specification, the number of shots must be set to 25 [see Performance
a)
(Page 178)].
Echo Select (2.5.7.)
Algorithm (2.5.7.1.)
Selects the algorithm to be applied to the echo profile to extract the true echo.
Options
Position Detect (2.5.7.2.)
Defines where on the echo the distance measurement is determined.
Options
Related parameters
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 (Constrained Leading Edge Fit)
Range (2.5.7.4.) to 0.5 m (1.64 ft).
Echo Threshold (2.5.7.3.)
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 (2.5.9.1.)
exceeds Echo Threshold (2.5.7.3.), the echo is accepted as a valid echo and is evaluated.
Values
Related Parameters
Use this feature when an incorrect material level is reported.
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
Range: 1 to 25
Default: 25
a)
tF True First echo
*
F First echo
L Largest echo
BLF Best of Largest and First echo
Center
* Hybrid (Center and CLEF)
CLEF (Constrained Leading Edge Fit)
CLEF Range (2.5.7.4.)
Range: 0 to 99
Default: 5
Loss of Echo (LOE) Timer (2.3.6.)
Confidence (2.5.9.1.)
Parameter reference
133