12
58-610 Model R82 Radar Transmitter
• Foam can either absorb or reflect the microwave energy
depending upon the depth, dielectric, density and wall
thickness of the bubbles. Due to typical variations in the
amount (depth) of foam, it is impossible to quantify per-
formance. It may be possible to receive most, some or
none of the transmitted energy.
• Extremely high liquid levels (Overflow) conditions when
liquid very near the antenna (above the Blocking Distance)
can cause erroneous readings and measurement failure.
2.4
Mounting
The R82 Radar transmitter can be mounted to a vessel
using a variety of process connections. Generally, either a
threaded or flanged connection is used.
2.4.1 Installing the Transmitter
Before installing, make sure:
• Process temperature, pressure, dielectric, turbulence and
distance are within the antenna specifications for the
installation.
• End of antenna is protected from bending or breaking.
• Insulating material is not placed around any part of the
Radar transmitter including the antenna flange.
• Transmitter is being mounted in the optimal location. See
following sections: Location, Beam Angle, Obstructions,
Nozzles, Stillwells, and Open Channel Flow for specific
information.
2.4.1.1 Location
Ideally, the Radar transmitter should be mounted provid-
ing an unobstructed signal path to the liquid surface where
it should illuminate (with microwave energy) the largest,
possible surface area. See Section 2.4.1.2, Beam Angle.
Unavoidable obstacles will produce reflections that must
be minimized during field configuration. Mount in a
location equal to
1
⁄
2
the radius of tank top. Do not mount
in center of vessel nor closer than 10" (25 cm) from the
tank wall.
2.4.1.2 Beam Angle
Ideally, the beam pattern should illuminate the maximum
liquid surface with a minimum striking other objects in
the vessel including the tank wall.
1/2
Radius
> 10"
(25 cm)
W
Distance
Beam Spread
Feet
Meters
Feet
Meters
10
3
2.5
0.74
20
6
4.9
1.47
30
9
7.4
2.21
40
12
9.8
2.95
Figure 10
Figure 11
