Endress+Hauser Micropilot FMR51 - Page 38

Micropilot FMR51, FMR52
38 Endress+Hauser
Optimization options
• Antenna size
The bigger the antenna, the smaller the beam angle α and the fewer interference echoes
→  38.
• Mapping
The measurement can be optimized by means of electronic suppression of interference echoes.
• Antenna alignment
Take into account the marker on the flange or threaded connection →  41 →  44.
• Stilling well
A stilling well can be applied to avoid interferences →  45.
• Metallic screens mounted at a slope
They spread the radar signals and can, therefore, reduce interference echoes.
Beam angle
a
D
W
a
D
_
=
2
2
. .
tan
W
A0016891
 12 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.