Siemens SITRANS LR200 Instruction Manual page 103

2.6.3.6. Propagation Factor
Compensates for the change in microwave velocity from propagation in
free space.The value is used to compensate for changes in microwave
velocity due to propagation within a metal stillpipe, instead of in free
space.
Contact your Siemens Milltronics representative for other sizes and
propagation factor numbers.
1
The propagation factor is
constant for a given pipe
diameter, or can be determined
by comparing the radar
distance reading to the actual
process material distance
(measured from the reference
point
1.
For the reference point for the standard model, see
other configurations, see
7ML19985HP01 SITRANS LR 200 (PROFIBUS PA) – INSTRUCTION MANUAL
Range: 0.3000 to 1.5000
Values
Default: 1.000
Pipe Size (I.D.)
50 mm (2")
80 mm (3")
100 mm (4")
150 mm (6")
200 mm (8")
Note:
For waveguide antennas used as stillpipes, the propagation
factor value is shown on the process device tag.
SITRANS LR 200 distance
1
).
Example:
actual distance
LR 200 distance
Using the readings shown:
10.42m
12.6m
Enter the propagation factor: 0.827
Appendix D: Flange Adapter Versions
Propagation Factor
0.827
0.915
0.955
0.980
0.990
12.6 m
10.42 m
= p.f.
(propagation factor)
= 0.827
SITRANS LR 200 Dimensions
, page 44 onwards.
vent hole
on page 13. For
Page 97