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Reference Manual
00809-0100-4530, Rev BA
July 2009
Rosemount 5300 Series
3-6
Installation in Concrete
Silos
Considerations for Solid
Applications
The flexible single lead probe is recommended for solids and is available in
two versions to handle different loads and lengths:
• 0.16 in. (4 mm) diameter
Tensile strength is minimum 2698 lb (12 kN)
Collapse load is maximum 3597 lb (16 kN)
• 0.24 in. (6 mm) diameter
Tensile strength is minimum 6519 lb (29 kN)
Collapse load is maximum 7868 lb (35 kN)
Keep the following in mind when planning installation of the Rosemount 5300
in solid applications:
• There might be considerable down-pull forces on silo roofs caused by
the media, so the silo roof must withstand the maximum probe tensile
load
• The tensile load depends on silo size, material density, and the friction
coefficient. Forces increase with the buried length, the silo, and probe
diameter
• In critical cases, such as for products with a risk for build-up, use a 0.24
in. (6 mm) probe
• Depending on position, forces on probes are two to ten times greater
on probes with tie-down, than on probes with ballast weights
(1)
Guidelines for the tensile load from free-flowing solids acting on a suspended
probe without any tie-down or weight in a smooth metallic wall silo as shown
in Table 3-2. A safety factor of 2 is included for the figures. Consult your local
Emerson Process Management representative for more information.
Metal
(1) The weight should not be fixed for probe 100 ft (30 m) or longer.