Micropilot FMR66B HART
18
V. 1, Rev. 2, 26-07-2022
Hauser
D
H
max
100 to 150 mm (4 to 6 in)
1
450 mm (58 in)
≥150 mm (6 in)
2
200 mm (88 in)
In the case of longer nozzles, reduced measuring performance must be expected.
Please note the following:
• The end of the nozzle must be smooth and free from burrs.
• The edge of the nozzle should be rounded.
• Mapping must be performed.
• Please contact the manufacturer's support department for applications with nozzles that are
higher than indicated in the table.
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 (3 dB width). Microwaves are also emitted outside the
signal beam and can be reflected off interfering installations.
D
W
D
_
=
2
2
.
.
tan
W
α
α
A0031824
7
Relationship between beam angle α, distance D and beamwidth diameter W
The beamwidth diameter
W
depends on the beam angle
α
and the distance
D
.
Encapsulated antenna, PVDF 40 mm / 1-1/2", α = 8 °
W = D × 0.14
D
W
D
W
α
5 m (16 ft)
0.70 m (2.29 ft)
10 m (33 ft)
1.40 m (4.58 ft)
15 m (49 ft)
2.09 m (6.87 ft)
20 m (66 ft)
2.79 m (9.16 ft)
22 m (72.18 ft)
3.08 m (10.10 ft)
