Siemens SITRANS L Operating Instructions Manual page 105

Echo threshold (2.5.7.3.)
Description
Values
Factory default
Related
parameter
CLEF range (2.5.7.4.)
Note
• CLEF Range is referenced from Far Range.
• The value for CLEF Range must include the difference between Far Range and Low
Calibration Point, plus any level above the Low Calibration Point to be managed by the
CLEF algorithm.
The CLEF algorithm is used mainly to allow correct level reporting for low dK materials which
may otherwise cause an incorrect reading in an empty or almost empty vessel.
It is used from Far Range up to the level defined by CLEF range (see illustration below). Above
that point the Center algorithm is used. For more detail see CLEF range (Page 181).
Values
Related parameters
If the value for Far Range is changed after a CLEF Range value is entered, CLEF Range is
1)
reset to its default (0.00 m).
①
②
③
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
Sets the minimum echo confidence that the echo must meet in order to prevent
a Loss of Echo condition and the expiration of the LOE timer. When Confidence
(2.5.9.1.) (Page 107) exceed Echo Threshold, the echo is accepted as a valid echo
and is evaluated. Use this feature when an incorrect material level is reported.
Range: 0 to 99
5
LOE timer (2.3.6.) (Page 94)
Range: 0 to Far range (2.5.2.)
Default: 0.0 m
Position detect (2.5.7.2.)
Far range (2.5.2.)
CLEF range
Sensor reference point
Low calibration point (process empty level)
1)
Parameter assignment
7.3 Setup (2.)
105