User's Manual

Parameter reference
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 01/2014, A5E32221386-AB
111
Position Detect (2.5.7.2.)
Note
If a stillpipe is used, the setting for CL
EF range is determined by the horn size: see
CLEF
Range (2.5.7.4.)
for a table of values.
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 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
Timer (2.3.6.)
Use this feature when an incorrect material level is reported.