15
58-603 Pulsar
®
Model R86 Radar Transmitter
2.4 Mounting
The PULSAR Model R86 Radar transmitter can be mount-
ed to a vessel using a variety of process connections.
Generally, either a threaded or flanged connection is used.
For information about the sizes and types of connections
available, see Antenna Model Numbers, Section 3.8.2.
2.4.1 Installing the Antenna
Before installing, ensure that:
• Model and Serial numbers on the nameplates of the
PULSAR Model R86 transmitter and antenna are identical.
• Process temperature, pressure, dielectric, turbulence and
distance are within the antenna specifications for the
installation.
• Insulating material is not placed around any part of the
Radar transmitter including the antenna flange.
• Protective cap is kept on the antenna if the transmitter is to
be installed at a later time.
• Antenna is being mounted in the optimal location. See fol-
lowing sections: Location, Beam Angle, Obstructions and
Nozzles for specific information.
• If the liquid level comes in contact with the antenna, noise
and media buildup drastically decrease reliable measure-
ment. Liquid should not be allowed closer than two inches
(50 mm) from the bottom of the antenna or 12 inches (300
mm) from the sensor reference point, whichever is greater.
2.4.1.1 Location
Ideally, the Radar transmitter should be mounted providing
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. See Section 3.3.3,
Echo Rejection. Mount in a location equal to
1
⁄
2
the radius
of tank top. Do not mount in center of vessel nor closer
than 18" (45 cm) of tank wall. Contact Magnetrol
Technical Support when mounting closer than 18" (45 cm)
is required.
2.4.1.2
Beam Angle
The various horn antennas exhibit slightly different beam pat-
terns. Ideally, the beam pattern should illuminate with
microwave beam the maximum liquid surface with minimum
contact with other objects in the vessel including the tank wall.
Use the chart at left to determine the optimum installation
location.
1/2
Radius
> 18"
(45 cm)
D
W
∝
Beam Spread, W @-3dB; ft (m)
Antenna
Beam Angle
(
∝
)
1
1
⁄
2
" Horn
20°
2" Horn
18°
3" Horn
11°
4" Horn
9°
Distance, D
10 (3)
3.5 (1.1)
3.2 (1.0)
1.9 (0.6)
1.6 (0.5)
20 (6)
7.1 (2.1)
6.3 (1.9)
3.9 (1.2)
3.1 (0.9)
30 (9)
10.6 (3.2)
9.5 (2.9)
5.8 (1.7)
4.7 (1.4)
40 (12)
14.1 (4.2)
12.7 (3.8)
7.7 (2.3)
6.3 (1.9)
50 (15)
17.6 (5.3)
15.8 (4.8)
9.6 (2.9)
7.9 (2.4)
60 (18)
21.2 (6.3)
19.0 (5.7)
11.6 (3.5)
9.4 (2.8)
65 (20)
20.6 (6.3)
12.5 (3.9)
10.2 (3.1)
98 (30)
18.9 (5.8)
15.4 (4.7)
130 (40)
20.5 (6.3)
