Appendix A: Technical reference
A.2 Echo processing
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
237
A.2.3
CLEF Range
CLEF Range (2.5.7.4.)
is referenced from Low Calibration Point (process empty level). When
the
Hybrid
algorithm is selected in
Position Detect (2.5.7.2.)
, the CLEF algorithm will be
applied up to the limit of CLEF Range. Above this limit the Center algorithm will be applied.
①
CLEF Range
②
(Center algorithm applied)
③
High Calibration Point (process full level)
④
Sensor reference point
⑤
Low Calibration Point (process empty level)
A.2.4
Measurement Response
Note
Units are defined in
Units (2.3.1.)
and are in meters by default.
Response Rate (2.3.8.1.)
limits the maximum rate at which the display and output respond
to changes in the measurement. There are three preset options: slow, medium, and fast.
Once the real process fill/empty rate (m/s by default) is established, a response rate can be
selected that is slightly higher than the application rate. Response Rate automatically adjusts
the filters that affect the output response rate.
Note
Changing Response Rate resets
Fill Rate per Minute (2.3.8.2.)
,
Empty Rate per Minute
(2.3.8.3.)
, and
Shots (2.5.6.)
.
Response Rate
(2.3.8.1)
Fill Rate (2.3.8.2)/Empty Rate (2.3.8.3)
*
Slow
0.1 m/min (0.32 ft/min)
25
Medium
1.0 m/min (3.28 ft.min)
10
Fast
10.0 m/min (32.8 ft/min)
5