User's Manual

Parameter reference
SITRANS LR250 (FOUNDATION FIELDBUS)
146 Operating Instructions, 01/2014, A5E32221411-AB
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.