Emerson Rosemount 5408, Reference Manual

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Table 3-7: Nozzle Requirements for Parabolic Antenna, in Inches (Millimeters)
Nozzle size (D) Inclination angle ( α ) Maximum nozzle height
(H)
(1)
Pipe schedule std, Ø 8 in. (200
mm) 0° 6.1 (155)
3° 3.4 (85)
6° 1.6 (40)
9° 1.2 (30)
12° 1.0 (25)
15° 0.6 (15)
Pipe schedule std, Ø10 in. (250
mm) 0° 17.2 (440)
3° 10.2 (260)
6° 7.1 (180)
9° 5.1 (130)
12° 3.9 (100)
15° 3.0 (75)
(1) Note that the inside of the nozzle must be smooth (i.e. avoid bad welding, rust, or deposit).
3.3.8 Still pipe/chamber installations
Installation in still pipe/chamber is recommended for tanks where there are excessive
foaming or turbulence. Still pipe/chamber may also be used to avoid disturbing objects in
the tank.
For more information and installation requirements, refer to the Best Practices for Using
Radar in Still Pipes and Chambers
Technical Note .
Still pipe
Consider the following still pipe requirements:
Pipe • Pipes should be an all-metal material.
• Pipe should have a constant inside diameter.
• The inner surface must be smooth and clear of any rough edges. (Smooth
pipe joints are acceptable, but may reduce accuracy.)
• The end of the pipe must extend beyond the zero level.
Holes • Maximum hole diameter is 1 in. (25 mm).
• Minimum distance between holes is 6 in. (150 mm).
• Holes should be drilled on one side only and deburred.
• Drill one hole above maximum product surface.
Reference Manual Mechanical installation
00809-0100-4408 February 2020
Rosemount 5408 and 5408:SIS Level Transmitters 29