Installation In Still Pipe/Chamber - Emerson Rosemount 5408 Reference Manual

Mechanical Installation
November 2016
3.2.8

Installation in still pipe/chamber

Installation in still pipe/chamber is recommended for tanks where surface conditions may
be extremely turbulent. By using a pipe, foam or turbulence is reduced. All cone antenna
sizes can be used for still pipe/chamber installations. Consider the following still pipe
requirements:
Pipe
(1)
Holes
Antenna
Figure 3-7. Still Pipe Requirements
Level = 100%
Level = 0%
1. For guidelines on slotted pipes, consult your local Emerson Automation Solutions representative.
16
PRELIMINARY
Pipes should be an all-metal material.
Pipe should have a constant inside diameter.
The inner surface must be smooth and clear of any rough edges.
(Smooth pipe joints are acceptable, but may reduce accuracy.)
The end of the pipe must extend beyond the zero level.
Minimum hole diameter is 0.25 in. (6 mm).
Maximum hole diameter should not exceed 10% of the pipe diameter (D).
Minimum distance between holes is 6 in. (150 mm).
Holes should be drilled on one side only and deburred.
Drill one hole above maximum product surface.
The gap between cone antenna and still pipe is limited to 0.2 in. (5 mm). If
required, order an oversized antenna and cut on location.
Max. 1°
Pipe diameter (D)
Min. 0.25 in. (6 mm)
Max. D/10
Min. 6 in. (150 mm)
00809-0100-4408, Rev AA
Max. 0.2 in.
(5 mm)
Reference Manual
Mechanical Installation