Endress+Hauser Micropilot M FMR231, Руководство по эксплуатации

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Mounting Micropilot M FMR231 with FOUNDATION Fieldbus
16 Hauser
Beam angle
The beam angle is defined as the angle a 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. Beam diameter
W as function of
antenna type (beam angle
α
) and measuring distance D :
Antenna
FMR 231
Rod
L00-FMR2xxxx-14-00-06-de-027
Beam angle
α
30°
Measuring dis-
tance (D)
Beam diameter (W)
Rod
3 m (10 ft) 1.61 m (5.36 ft)
6 m (20 ft) 3.22 m (10.72 ft)
9 m (30 ft) 4.82 m (16.08 ft)
12 m (40 ft) 6.43 m (21.44 ft)
15 m (49 ft) 8.04 m (26.26 ft)
20 m (65 ft) 10.72 m (34.83 ft)
a
D
W
a
D
_
=
2
2 .
. tan
W