Product Data Sheet
00813-0100-4530, Rev DA
December 2010
35
Rosemount 5300 Series
Centering Discs To prevent the probe from contacting the chamber or pipe wall, centering discs
are available for rigid single, flexible single, and flexible twin lead probes. The
disc is attached to the end of the probe. Discs are made of stainless steel, Alloy
C-276, Alloy 400, or PTFE. The centering disc in PTFE is not available for
HTHP probes. See Table 13 for Dimension D. Table 14 shows which centering
disc diameter to choose for a particular pipe.
TABLE 11. Minimum Clearance
Rigid Single Lead Flexible Single Lead Coaxial Rigid Twin Lead Flexible Twin Lead
Recommended
nozzle diameter
6 in. (15 cm) or more 6 in. (15 cm) or more
Enough space to fit
the probe
4 in. (10 cm) or more 4 in. (10 cm) or more
Min. nozzle
diameter
(1)
2 in. (5 cm) 2 in. (5 cm)
Enough space to fit
the probe
2 in. (5 cm) 2 in. (5 cm)
Min. clearance to
tank wall (L) or
obstruction
(2)
4 in. (10 cm) if
smooth metallic wall.
20 in. (50 cm) if
disturbing objects,
rugged metallic or
concrete/plastic wall.
4 in. (10 cm) if
smooth metallic wall.
20 in. (50 cm) if
disturbing objects,
rugged metallic or
concrete/plastic wall.
0 in. (0 cm) 4 in. (10 cm) 4 in. (10 cm)
Min. chamber/still
pipe diameter
2 in. (5 cm)
(3)
Consult the factory 1.5 in. (3.8 cm) 2 in. (5 cm)
(4)
Consult the factory
(1) Requires special configuration and setting of Upper Null Zone and may affect the maximum measuring range.
(2) Minimum clearance from tank bottom for the coaxial and rigid single probes is 0.2 in. (5 mm).
(3) The probe must be centered in the pipe/bypass. A centering disc (see “Centering Discs” on page 35 and “Ordering Information” on page 4) can be used to
prevent the probe from contacting the chamber wall.
(4) The centermost lead must be at least 0.6 in. (15 mm) away from the pipe/bypass wall.
TABLE 12. Required probe length in chambers
Chamber Manufacturer Probe Length
(1)
(1) If flushing ring is used, add 1 in. (25 mm).
Major torque-tube manufacture
(249B, 249C, 2449K, 249N, 259B)
Displacer+9 in. (229 mm)
Masoneilan (Torque tube
operated), proprietary flange
Displacer+8 in. (203 mm)
Other - torque tube
(2)
(2) For other manufacturers, there are small variations. This is an
approximate value, actual length should be verified.
Displacer+8 in. (203 mm)
Magnetrol (spring operated)
(3)
(3) Lengths vary depending on model, SG and rating, and should be
verified.
Displacer+between
7.8 in. (195 mm) to
15 in. (383 mm)
Others - spring operated
(2)
Displacer+19.7 in.
(500 mm)
TABLE 13. Centering Disc Dimensions
Disc Size Actual Disc Diameter
2 in. 1.8 in. (45 mm)
3 in. 2.7 in. (68 mm)
4 in. 3.6 in. (92 mm)
6 in. 5.55 in. (141 mm)
8 in. 7.40 in. (188 mm)
TABLE 14. Centering disc size
recommendation for different pipe schedules
Pipe Schedule
Pipe Size 5s,5 10s,10 40s,40 80s,80 120 160
2 in. 2 in. 2 in. 2 in. 2 in. NA
(1)
(1) Schedule is not available for pipe size.
NA
(2)
(2) No centering disc is available.
3 in. 3 in. 3 in. 3 in. 3 in. NA
(1)
2 in.
4 in. 4 in. 4 in. 4 in. 4 in. 4 in. 3 in.
5 in. 4 in. 4 in. 4 in. 4 in. 4 in. 4 in.
6 in. 6 in. 6 in. 6 in. 6 in. 4 in. 4 in.
7 in. NA
(1)
NA
(1)
5 in. 6 in. NA
(1)
NA
(1)
8 in. 8 in. 8 in. 8 in. 8 in. 6 in. 6 in.
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