Emerson Rosemount 3300 Series User Manual

00809-0100-4811, Rev CA
February 2006

3-9

Rosemount 3300 Series

In order to prevent the probe from contacting the bridle wall when replacing 
displacers or installing in pipes, centering discs are available for the Rigid 
Single, Flexible Single and Flexible Twin Lead probes. The disc is attached to 
the end of the probe and thus keeps the probe centered in the bridle. The 
discs are available in stainless steel and teflon (PTFE). See also “Mounting a 
Centering Disc for Pipe Installations“ on page 3-20.

Figure 3-5. Mounting in 
Still Pipes.

Note! It is not recommended that flexible 
probes are installed in by-pass pipes.

Rigid Single Lead.
Pipe diameter Ø

≥2 inch (50 mm).

Inlet pipe diameter N<Ø.
L

≥12 inch (300 mm).

Flexible Single Lead.
Pipe diameter Ø

≥4 inch (100 mm).

Note! For smaller pipes please consult 
factory.

Make sure that the probe is at the center of 
the Still pipe by, for example, using a 
centering disc.

Note! It is not recommended that flexible 
probes are installed in by-pass pipes.

Rigid Twin Lead.
Pipe diameter Ø

≥2 inch (50 mm).

Inlet pipe diameter N<Ø.
L

≥12 inch (300 mm).

The center rod must be placed more than 
0.6 inch/15 mm away from the pipe wall. 

Flexible Twin Lead.
Pipe diameter Ø

≥4 inch (100 mm).

Note! For smaller pipes please consult 
factory.

The center rod must be placed more than 
0.6 inch/15 mm away from the pipe wall. The 
probe may under no circumstances get into 
contact with the pipe wall. It is recommended 
that a centering disc is used.

Coaxial Lead.
Pipe diameter Ø

≥1.5 inch (38 mm).

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