Siemens SITRANS LR250 Operating Instructions Manual page 112

Nominal Pipe Size
Propagation Factor
CLEF (Constrained
Leading Edge Fit)
Range (2.5.7.4.)
settings
a)
Since pipe dimensions may vary slightly, the propagation factor may also vary.
2.5.4. Minimum Sensor Value
The minimum usable value for the measuring range, in units defined in Unit
(2.3.1.). (Default = 0.0 m)
To view this parameter via AMS Device Manager see Range under Signal
Processing (LTB)
2.5.5. Maximum Sensor Value
The maximum usable value for the measuring range, in units defined in Unit
(2.3.1.). (Default = 33.0 m)
To view this parameter via AMS Device Manager see Range under Signal
Processing (LTB)
2.5.6. Shots
The number of echo profile samples averaged to produce a measurement.
Values
a)
To meet accuracy specification, the number of shots must be set to 25
(see Performance on page 7).
2.5.7. Echo Select
2.5.7.1.
Selects the algorithm to be applied to the echo profile to extract the true
echo.
Options
Page 106 SITRANS LR250 (FF) – OPERATING INSTRUCTIONS
a) 40 mm (1.5")
0.9828
Low Cal Pt.
minus 700
mm (2.29 ft)
on page 55
.
on page 55
.
Range: 1 to 25
Default: 25
Algorithm
TF *
F
L
BLF
50 mm (2")
0.990
Low Cal Pt. Low Cal Pt.
minus 700 minus 1000
mm (2.29 ft) mm (3.28 ft)
a)
True First echo
First echo
Largest echo
Best of Largest and First echo
80 mm (3") 100 mm (4")
0.991 0.9965
Low Cal Pt.
minus 1000
mm (3.28 ft)
7ML19985KL01