Product Data Sheet
00813-0100-4530, Rev AA
Catalog 2008 - 2009
Rosemount 5300 Series
Level-14
Solids
Rosemount 5303 is the perfect choice for most solid
applications such as powders, granulates, or pellets
with a grain size of up to 0.8 in. (20 mm). Material
include plastics, fly-ash, cement, sand, sugar,
cereals etc.
Measurements are independent of dust, moisture,
and material fluctuations such as density and
temperature. Even electrostatic discharges which
can occur for plastics, cannot harm the 5303
transmitter.
The measured value is where the probe comes in
contact with the material, which means that the
shape of the material surface in the silo is not critical
for the measurement.
The flexible single lead probe is recommended for
solids. It is available in two versions to handle
different loads and lengths:
• 0.16 in. (4 mm) in diameter.
Tensile strength is min. 2698 lb (12 kN).
Collapse load is max. 3597 lb (16 kN).
• 0.24 in. (6 mm) in diameter.
Tensile strength is min. 6519 lb (29 kN).
Collapse load is max. 7868 lb (35 kN).
It is important to keep the following in mind when
planning for installation:
• In solid applications, media might cause
down-pull forces on silo roofs. The silo roof
must be able to withstand the probe collapse
load or at least the maximum probe tensile
load.
• The tensile load depends on the 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, it is better
to use a 0.24 in. (6 mm) probe.
• Depending on their position, forces on probes
are generally two to ten times greater on
probes with tie-down than on probes with
ballast weights
(1)
.
The table below shows guidelines for the tensile load
from free-flowing solids acting on a suspended
probe, without any tie-down or weight, in a silo with
smooth metallic walls. A safety factor of 2 is included
for the figures. Consult factory for more information.
NOTE:
Abrasive media can wear out the probe.
Consider using a non-contacting radar.
(1) The weight should not be fixed for 100 ft (30 m) or
longer probes.
Material Tensile load for 0.16 in. (4 mm)
flexible single lead probe, lb (kN)
Tensile load for 0.24 in. (6 mm)
flexible single lead probe, lb (kN)
Probe length 49 ft (15 m) Probe length 115 ft (35 m) Probe length 49 ft (15 m) Probe length 115 ft (35 m)
Tank Ø=
10 ft (3 m)
Tank Ø=
39 ft (12 m)
Tank Ø=
10 ft (3 m)
Tank Ø=
39 ft (12 m)
Tank Ø=
10 ft (3 m)
Tank Ø=
39 ft (12 m)
Tank Ø=
10 ft (3 m)
Tank Ø=
39 ft (12 m)
Wheat 670 (3) 1120 (5) 1800 (8) 4500 (20).
Not
applicable
900 (4) 1690 (7.5) 2810 (12.5) 6740 (30).
Exceeds the
tensile
strength
limit.
Polypropylene
Pellets
340 (1.5) 670 (3) 810 (3.6) 2360 (10.5) 450 (2) 920(4.1) 1190 (5.3) 3510 (15.6)
Cement 900 (4) 2020 (9) 2470 (11) 7310 (32.5).
Not
applicable
1350 (6) 2920 (13) 3600 (16) 10790 (48).
Exceeds the
tensile
strength
limit.
(38 paginas)
(3 paginas)
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