Siemens Sitrans Probe LR Operating Instructions Manual page 60

P655 Propagation Factor
The value used to compensate for changes in microwave velocity due to propagation
within a metal stillpipe, instead of in free space.
Values
Pipe Size (I.D.)
50 mm (2")
80 mm (3")
100 mm (4")
150 mm (6")
200 mm (8")
a.
Contact your Siemens 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
Example:
actual distance
SITRANS Probe LR distance
Using the readings shown:
10.42m
12.6m
Enter the propagation factor: 0.827
1.
For the reference point, see
Page 54 SITRANS Probe LR – INSTRUCTION MANUAL
Range
Default
1
).
= p.f.
(propagation
factor)
= 0.827
SITRANS Probe LR: Dimensions
0.3000 to 1.5000
1.000
Propagation Factor
0.827
0.915
0.955
0.980
0.990
SITRANS Probe LR
distance
12.6 m
10.42 m
on page 15.
a
vent hole
7ML19985HR02