Parameter reference
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
133
Shots (2.5.6.)
The number of echo profile samples averaged to produce a measurement.
Values
Range:
1
to
25
Default: 25
a)
a)
To meet accuracy specification, the number of shots must be set to 25 [see Performance
(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
*
tF
T
rue
F
irst echo
F
F
irst echo
L
L
argest echo
BLF
B
est of
L
argest and
F
irst echo
Position Detect (2.5.7.2.)
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 (2.5.7.4.)
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 (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
Range:
0
to
99
Default: 5
Related Parameters
Loss of Echo (LOE) Timer (2.3.6.)
Confidence (2.5.9.1.)
Use this feature when an incorrect material level is reported.