Endress+Hauser HART Micropilot S FMR533 - Page 12

Mounting Micropilot S FMR533 4 to 20 mA HART
12 Endress+Hauser
Beam angle
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 (3dB-width). Microwaves are also emitted outside the
signal beam and can be reflected off interfering installations.
Beamwidth diameter W as function of antenna type (beam angle α) and measuring distance D:
"
Caution!
Make sure that only one tank wall (not two tank walls) is directly hit by the radar beam!
parabolic
L00-FMR53xxx-14-00-00-xx-003
Beam angle α 7°
Gauge Reference Height
(GRH)
recommended distance from
the tank wall (W/2)
3 m (10 ft) 0.2 m
6 m (20 ft) 0.4 m
9 m (30 ft) 0.6 m
12 m (40 ft) 0.7 m
15 m (49 ft) 0.9 m
20 m (65 ft) 1.2 m
25 m (82 ft) 1.5 m
38 m (114 ft) 2.3 m
40 m (120 ft) 2.4 m
D
W/2