Beam Angle - Endress+Hauser Micropilot FMR10 Operating Instructions Manual

Micropilot FMR10
Endress+Hauser
 6 Device alignment for installation on a vessel
5.1.5

Beam angle

 7 Relationship between beam angle α, distance D and beamwidth diameter W
The beam angle is defined as the angle α at which the power density of the radar waves
reaches half the value of the maximum power density (3 dB width). Microwaves are also
emitted outside the signal beam and can be reflected off interfering installations.
Beam diameter W as a function of beam angle α and distance D.
40 mm (1.5 in) antenna, α 30 °
W = D × 0.54
40 mm (1.5 in) antenna with flooding protection tube, α 12 °
W = D × 0.21
°
9 0
9 0
°
9 0
°
_ α
W = 2 × D × tan
2
α
W
Installation
A0028927
A0033201
15