Far Range (2.8.2.); Propagation Factor (2.8.3.); Echo Select (2.8.4.) - Siemens SITRANS LR200 7ML5422 Operating Instructions Manual

7.2.7.2

Far range (2.8.2.)

Description
Values
Factory setting
Note
Far Range can extend beyond the bottom of the vessel.
7.2.7.3

Propagation factor (2.8.3.)

Propagation Factory compensates for the change in microwave velocity due to propagation
within a metal stillpipe instead of in free space.
Note
When operating with a waveguide antenna or stillpipe, values for CLEF range (2.8.4.4.)
(Page 112) and for the propagation factor should be set according to the antenna frequency
and the antenna/pipe size (see the tables below). For reliable results the horn size must be
close to the pipe size
6.3 GHz Model
Values
Factory setting
Antenna/Pipe
Size (I.D.)
Propagation
Factor
Since pipe dimensions may vary slightly, the propagation factor may also vary.
1)
7.2.7.4

Echo select (2.8.4.)

Algorithm (2.8.4.1.)
Description
Options
SITRANS LR200 with mA/HART
Operating Instructions, 05/2019, A5E32337676-AE
Allows the material level to drop below Low Calibration Point without generating
a Loss of Echo (LOE) state. Use this feature if the measured surface can drop
below the Low Cal. Point in normal operation. For an illustration, refer to Sensor
mode (2.2.2.) (Page 99).
0 to 23 m (75.4 ft). Min. value depends on the setting for Low calibration point
(2.3.1.) (Page 100).
Low calibration point (2.3.1.) (Page 100) setting + 1 m (3.2 ft)
Range: 0.3 to 1.5 depending on pipe size.
1.000
50 mm (2") 80 mm (3")
1)
0.8298 0.9372
Selects the algorithm to be applied to the echo profile to extract the true echo.
tF (factory setting)
L
BLF
100 mm (4") 150 mm (6")
0.9603 0.9825
true First echo
Largest echo
Best of First or Largest echo
200 mm (8")
0.9902
111