Table 3-14: Centering Disc Size Recommendation for Different Pipe Schedules
Pipe size Pipe schedule
5s, 5 and 10s,10 40s, 40 and 80s, 80 120 160
2-in. 2-in. 2-in. N/A
(1)
N/A
(2)
3-in. 3-in. 3-in. N/A
(1)
2-in.
4-in. 4-in. 4-in. 4-in. 3-in.
5-in. 4-in. 4-in. 4-in. 4-in.
6-in. 6-in. 6-in. 4-in. 4-in.
7-in. N/A
(1)
6-in. N/A
(1)
N/A
(1)
8-in. 8-in. 8-in. 6-in. 6-in.
(1) Schedule is not available for pipe size.
(2) No centering disc is available.
Table 3-15: Centering Disc Size Recommendations for Rosemount 9901 Chambers
Chamber size Chamber rating Centering disc
3-in. Up to Class 600/PN 100 3-in.
Class 900, 1500/PN160, 250 2-in.
3-in. T-piece Up to Class 600/PN 100 2-in.
4-in. Up to Class 600/PN 100 4-in.
Class 900, 1500/PN160, 250 3-in.
To avoid bending the probe (rigid probes), or twisting and coming into contact with the
chamber wall (flexible probes), a small clearance distance between centering disc and
chamber bottom is recommended. The clearance distance of 1 in. (25 mm) is selected
with a dome shaped chamber bottom in mind, which may prevent the centering disc from
reaching the bottom.
Mechanical installation Reference Manual
April 2019 00809-0100-4530
62 Rosemount 5300 Level Transmitter
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