Range Calibration Parameter (P655) - Siemens SITRANS LR 300 Instruction Manual

Range Calibration Parameter (P655)

P655 Propagation Factor (F = 1)
Compensates for the change in the microwave velocity as compared with propagation in
free space, when propagation is within a stillpipe (metal).
Values
Pipe Size (I.D.)
50 mm (2")
80 mm (3")
100 mm (4")
150 mm (6")
200 mm (8")
Consult Technical Assistance at the factory for other sizes and propagation factor
numbers.
Note:
For waveguide antennas used as stillpipes, the propagation factor value is
shown on the process device tag.
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 face of the
SITRANS LR 300 flange).
Example:
actual distance
SITRANS LR 300 distance
Using the readings shown:
10.42m = 0.827
12.6m
Enter the propagation factor : 0.827
Page 68
0.0000 to 1.0000
Range:
Pre-set: 1
Propagation Factor
0.827
0.915
0.955
0.980
0.990
= p.f. (propagation
factor)
SITRANS LR 300 – INSTRUCTION MANUAL
SITRANS LR 300 distance
10.42 m
7ML19985CL02