Emerson Rosemount 5408 Reference Manual page 22

Mechanical installation
June 2019
Table 3-1: Distance to Tank Wall (L)
Application
Liquids
Solids
Table 3-2: Free Space Requirements
Description
Service space width (A)
Service space height (B)
3.3.3 Antenna size
Choose as large antenna diameter as possible. A larger antenna diameter concentrates the
radar beam and ensures maximum antenna gain. Increased antenna gain permits greater
margin for weak surface echoes.
In addition, a larger antenna diameter results in a smaller beam angle and thereby, less
interference from any internal structures in the tank.
3.3.4 Antenna inclination
Ensure the antenna is aligned perpendicular to the product surface (see
parabolic antenna comes with a swivel connection that adjusts for angled tank roofs.
Note that if the surface echo is weak in solids applications, then a small inclination of the
parabolic antenna toward the surface slope may improve the performance.
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Minimum
8 in. (200 mm)
8 in. (200 mm)
Distance
20 in. (500 mm)
24 in. (600 mm)
Reference Manual
00809-0300-4408
Recommended
½ of tank radius
⅔ of tank radius
Figure 3-4). The
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