Endress+Hauser Micropilot FMR53 - Measuring Conditions

Micropilot FMR53, FMR54 HART Installation
Endress+Hauser 19
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.
Beam diameter W as a function of beam angle α and measuring distance D:
FMR53
Beam angle α 23°
Measuring distance (D) Beamwidth diameter W
3 m (9.8 ft) 1.22 m (4 ft)
6 m (20 ft) 2.44 m (8 ft)
9 m (30 ft) 3.66 m (12 ft)
12 m (39 ft) 4.88 m (16 ft)
15 m (49 ft) 6.1 m (20 ft)
20 m (66 ft) 8.14 m (27 ft)