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15
BE 58-602 Pulsar
®
Model R96 Radar Transmitter
2.4 Mounting
The PULSAR Model R96 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 R96 transmitter and antenna are identical.
• Process temperature, pressure, dielectric, turbulence and
distance are within the antenna specifications for the
installation.
• Rod of a Dielectric Rod antenna is protected from bending
or breaking; there is no metal sub-structure.
• 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 is allowed onto the antenna, noise and
media buildup drastically decrease reliable measurement.
Liquid should not be allowed closer than 50 mm (2") from
the bottom of the antenna.
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 3.3.2,
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 45 cm (18") of tank wall.
2.4.1.2 Beam Angle
The various antenna designs exhibit different beam patterns.
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
drawings at left to determine the optimum installation location.
D
W
W
∝
∝
>45 cm
(>18")
1/2
Radius
Antenna
Beam Angle
(
∝
)
Beam Spread, W @-3dB; m (ft)
Dielectric
Rod
25°
4" Horn
25°
6" Horn
17°
Distance, D
3 (10)
1,4 (4.5)
1,0 (3.0)
6 (20)
2,7 (8.9)
1,8 (6.0)
9 (30)
4,11 (3.3)
2,7 (9.0)
12 (40)
5,4 (17.8)
3,7 (12.0)
15 (50)
6,8 (22.2)
4,6 (15.0)
18 (60)
8,1 (26.6)
5,5 (18.0)
20 (65)
8,8 (28.9)
6,0 (19.5)
30 (98)
*
9,0 (29.3)
40 (130)
*
12,0 (39.0)
*Dielectric rod and 4" horn not recommended beyond 20 m (65 ft).