Emerson Rosemount 5402 Reference Manual page 39

Reference Manual
00809-0100-4026, Rev KC
Rosemount 5401 with rod antenna
The active part of the rod antenna should protrude below the nozzle (O).
Figure 3-13. Nozzle Considerations for Rosemount 5401 with Rod Antenna
Active part
starts here
Still-pipes in metallic materials
If used correctly, pipe measurement can be advantageous in many applications.
The Rosemount 5402 is the preferred choice for smaller pipe diameters.

Use the Rosemount 5401 for larger pipe diameters (6-8 in./150-200 mm),

pipes with larger holes or slots, or for dirty/sticky media.
Use cone or process seal antennas - not the rod antenna or the parabolic antenna.

The gap between the cone antenna and the still-pipe is limited to 0.2 in. (5 mm). If required, order an

oversized antenna and cut on location (P). Only applicable to Rosemount 5401 cone antennas and
cone antennas with wetted flange plate (i.e. straight antennas).
The inside of the chamber must be of a constant diameter.

Note
Match antenna size to the stilling well diameter.
Figure 3-14. Nozzle Considerations for Still-Pipes in Metallic Materials
Mechanical Installation
Max. 4 or 10 in.
(O)
(100 or 250 mm)
for short and
long version
respectively
(P)
Max. 0.2 in.
(5 mm)
Mechanical Installation
October 2018
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