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Reference Manual
00809-0100-4530, Rev BA
July 2009
Rosemount 5300 Series
3-8
Figure 3-5. Mounting Single
Probe in Chamber/Still Pipe
Inlet pipe diameter N<Ø. Effective measuring range L12 in. (300 mm).
Table 3-3. Recommended and
minimum chamber/still pipe
diameters for different probes.
The recommended chamber diameter is 3 in. (75 mm) or 4 in. (100 mm).
Chambers with a diameter less than 3 in. (75 mm) may cause problems with
build-up and it may also be difficult to avoid contact between chamber wall
and probe. Chambers larger than 6 in. (150 mm) can be used but provide no
advantages for radar measurement.
It is recommended that single probes are used with the Rosemount 5300
Series. Other probe types are more susceptible to build-up and are not
recommended.
(1)
An exception is with liquefied gas > 40 bar when the coaxial
probe should be used.
The probe must not touch the chamber wall, should extend the full height of
the chamber, but not touch the bottom of the chamber. Probe type selection
depends on probe length:
Less than 14.7 ft (4.5 m): Rigid Single Probe is recommended. Use a
centering disc for a probe > 3.3 ft. (1 m). If installation requires less
head-space, use a Flexible Single Probe with a weight and centering disc.
(2)
More than 14.7 ft (4.5 m): Use Flexible Single Probe with a weight and
centering disc.
Rigid Single
Flexible Single
N
L
Ø
Ø
Probe Type Recommended Diameter Minimum Diameter
Rigid Single 3 or 4 in. (75 or 100 mm) 2 in. (50 mm)
Flexible Single
4 in. (100 mm) Consult your local Emerson
Process Management
representative
Rigid Twin
(1)
(1) The center rod must be placed more than 0.6 in. (15 mm) away from the pipe wall.
3 or 4 in. (75 or 100 mm) 2 in. (50 mm)
Flexible Twin
(1)
4 in. (100 mm) Consult your local Emerson
Process Management
representative
Coaxial 3 or 4 in. (75 or 100 mm) 1.5 in. (37.5 mm)
(1) The single probe creates a virtual coaxial probe with the chamber as the outer tube. The
extra gain provided by the twin and coaxial probes is not necessary; the electronics in the
Rosemount 5300 Series is very sensitive and is not a limiting factor.
(2) The transition zones and the height of the weight limit the use of single flexible probes
shorter than 3 ft. (1 m). If using the flexible probe, the short weight is recommended.