The PULSAR Model R86 Radar transmitter can be mounted
on a vessel using a variety of process connections.
Generally either a threaded or flanged connection is used.
L O C A T I O N
Ideally, the Radar transmitter should be mounted
1
⁄
2
radius
from center of the tank providing an unobstructed signal
path to the liquid surface where it can illuminate (with
microwave energy) the largest possible surface area. A
conservative recommendation is to not install in center of
tank top or within 18 inches (45 cm) of tank wall. Tank
walls may produce reflections that must be minimized
during field configuration. Refer to Figure 7.
B E A M A N G L E
The various antenna sizes exhibit different beam patterns.
Figure 9 shows the beam spread for all PULSAR Model R86
antennas. Ideally the beam pattern should illuminate the
maximum liquid surface with minimum striking of other
objects in the vessel including the tank wall. Use these
drawings to determine the optimum installation location.
O B S T R U C T I O N S
Almost any object that falls within the beam pattern will
cause reflections that may be misinterpreted as a false liq-
uid level. Although the PULSAR Model R86 has a power-
ful Echo Rejection routine, all possible precautions should
be taken to minimize false target reflections with proper
installation location. Refer to Figures 8 & 9.
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)
Figure 7
M O U N T I N G
Figure 8
Figure 9
4
feet (meters)
