Emerson Process Management 5300 Rigid Single, Probe Type Recommended Diameter Minimum Diameter

Rosemount 5300 Series

Reference Manual

00809-0100-4530, Rev BA July 2009

Figure 3-5. Mounting Single
Probe in Chamber/Still Pipe	Rigid Single	Flexible Single

N

L

Table 3-3. Recommended and minimum chamber/still pipe diameters for different probes.

ØØ

Inlet pipe diameter N<Ø. Effective measuring range L≥12 in. (300 mm).

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)	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 center rod must be placed more than 0.6 in. (15 mm) away from the pipe wall.

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.

(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.

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