Endress+Hauser Micropilot FMR52 - Page 16

Installation Micropilot FMR51, FMR52 PROFIBUS PA
16 Endress+Hauser
6.1.6 Beam angle
a
D
W
a
D
_
=
2
2
. .
tan
W
A0016891
 4 Relationship between beam angle α, distance D and beamwidth diameter W
The beam angle is defined as the angle α where the energy density of the radar waves reaches
half the value of the maximum energy density (3-dB-width). Microwaves are also emitted
outside the signal beam and can be reflected off interfering installations.