Mount A Centering Disc For Pipe Installations - Emerson Rosemount 3308A Reference Manual

Installation
August 2017
3.4.3

Mount a centering disc for pipe installations

To prevent the probe from contacting the chamber or pipe wall, centering discs are available for flexible
single, rigid 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, Duplex 2205, or PTFE.
When mounting a centering disc, it is important that it fits correctly in the chamber/pipe. See
for Dimension D.
Figure 3-11. Dimension D for Centering Discs
D
Table 3-4. Centering Discs Dimensions
Disc size
2-in.
3-in.
4-in.
6-in.
8-in.
Table 3-5. Centering Disc Size Recommendation for Different Pipe Schedules
Pipe size
2-in.
3-in.
4-in.
5-in.
6-in.
7-in.
8-in.
1. Schedule is not available for pipe size.
2. No centering disc is available.
28
PRELIMINARY
Table 3-5 shows which centering disc diameter to choose for a particular pipe.
Actual disc diameter (D)
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)
5s, 5 and 10s,10 40s, 40 and 80s, 80
2-in.
3-in.
4-in.
4-in.
6-in.
(1)
N/A
8-in.
Pipe schedule
120
2-in. N/A (1)
(1)
3-in. N/A
4-in. 4-in.
4-in. 4-in.
6-in. 4-in.
(1)
6-in. N/A
8-in. 6-in.
Reference Manual
00809-0100-4308, Rev CA
Table 3-4
160
N/A (2)
2-in.
3-in.
4-in.
4-in.
(1)
N/A
6-in.
Installation