Operating Instructions

Propagation Factor 0.9844 0.988 0.9935 0.9965
CLEF Range (2.8.4.4.) settings Low calibra‐
tion point -
700 mm
(2.29 ft)
b)
Low calibra‐
tion point -
700 mm
(2.29 ft)
b)
Low calibration
point -1000 mm
(3.28 ft)
b)
Low calibration
point -1000 mm
(3.28 ft)
b)
a)
Since pipe dimensions may vary slightly, the propagation factor may also vary.
b)
CLEF range covers the whole measurement range except first 700 or 1000 mm from unit reference
point (see A in graphic below)
1
2
3
4
$
① sensor reference point ③ low calibration point
② air gap ④ CLEF range 2.8.4.4.
A 700 or 1000 mm
Note
Flanged encapsulated antenna
For Flanged encapsulated antenna (7ML5432) match the process connection size to the pipe
diameter whenever possible (for example, mount a DN80/3" flange on DN80/3" pipe).
Echo Select (2.8.4.)
Algorithm (2.8.4.1.)
Selects the algorithm to be applied to the echo profile to extract the true echo.
Options * tF True First echo
L Largest echo
BLF Best of Largest and First echo
Parameter reference
SITRANS LR250 with mA/HART
122 Operating Instructions, 10/2019, A5E32220602-AG