Emerson Rosemount 5300 Series Product Data Sheet page 35

Product Data Sheet
00813-0100-4530, Rev DA
December 2010
Centering Discs
TABLE 11. Minimum Clearance
Rigid Single Lead
Recommended
6 in. (15 cm) or more
nozzle diameter
Min. nozzle
2 in. (5 cm)
(1)
diameter
4 in. (10 cm) if
smooth metallic wall.
Min. clearance to
20 in. (50 cm) if
tank wall (L) or
disturbing objects,
(2)
obstruction
rugged metallic or
concrete/plastic wall.
Min. chamber/still
2 in. (5 cm)
pipe diameter
(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
Major torque-tube manufacture
(249B, 249C, 2449K, 249N, 259B)
Masoneilan (Torque tube
operated), proprietary flange
(2)
Other - torque tube
Magnetrol (spring operated)
(2)
Others - spring operated
(1) If flushing ring is used, add 1 in. (25 mm).
(2) For other manufacturers, there are small variations. This is an
approximate value, actual length should be verified.
(3) Lengths vary depending on model, SG and rating, and should be
verified.
TABLE 13. Centering Disc Dimensions
Disc Size
2 in.
3 in.
4 in.
6 in.
8 in.
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.
Flexible Single Lead
6 in. (15 cm) or more
2 in. (5 cm)
4 in. (10 cm) if
smooth metallic wall.
20 in. (50 cm) if
disturbing objects,
rugged metallic or
concrete/plastic wall.
(3)
Consult the factory
(1)
Probe Length
Displacer+9 in. (229 mm)
Displacer+8 in. (203 mm)
Displacer+8 in. (203 mm)
(3)
Displacer+between
7.8 in. (195 mm) to
15 in. (383 mm)
Displacer+19.7 in.
(500 mm)
Actual Disc Diameter
1.8 in. (45 mm)
2.7 in. (68 mm)
3.6 in. (92 mm)
5.55 in. (141 mm)
7.40 in. (188 mm)
Rosemount 5300 Series
Coaxial Rigid Twin Lead
Enough space to fit
4 in. (10 cm) or more
the probe
Enough space to fit
2 in. (5 cm)
the probe
0 in. (0 cm) 4 in. (10 cm)
1.5 in. (3.8 cm) 2 in. (5 cm)
TABLE 14. Centering disc size
recommendation for different pipe schedules
Pipe Size 5s,5 10s,10 40s,40 80s,80 120
2 in. 2 in. 2 in.
3 in. 3 in. 3 in.
4 in. 4 in. 4 in.
5 in. 4 in. 4 in.
6 in. 6 in. 6 in.
(1)
7 in. NA NA
8 in. 8 in. 8 in.
(1) Schedule is not available for pipe size.
(2) No centering disc is available.
Flexible Twin Lead
4 in. (10 cm) or more
2 in. (5 cm)
4 in. (10 cm)
(4)
Consult the factory
Pipe Schedule
(1)
2 in. 2 in. NA
(1)
3 in. 3 in. NA
4 in. 4 in. 4 in.
4 in. 4 in. 4 in.
6 in. 6 in. 4 in.
(1) (1)
5 in. 6 in. NA
8 in. 8 in. 6 in.
D
160
(2)
NA
2 in.
3 in.
4 in.
4 in.
(1)
NA
6 in.
35