Still Pipe/Chamber Installations - Emerson Rosemount 5408 Reference Manual

Reference Manual
00809-0100-4408, Rev BA
3.3.8

Still pipe/chamber installations

Installation in still pipe/chamber is recommended for tanks where there are excessive foaming or
turbulence. Still pipe/chamber may also be used to avoid disturbing objects in the tank.
All cone/process seal antenna sizes can be used for still pipe/chamber installations.
Still pipe
Consider the following still pipe requirements:
Pipe
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.

Holes
Maximum hole diameter is 1 in. (25 mm).

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.

Antenna
The gap between the cone antenna and the still pipe should be maximum 0.2 in. (5 mm). If required,

order a larger antenna and cut on location. See
Figure 3-9. Still Pipe Requirements
Level = 100%
Level = 0%
Mechanical Installation
Max. 1°
Max. 1 in. (25 mm)
Min. 6 in. (150 mm)
Figure A-10 on page 163
Max. 0.2 in.
(5 mm)
Mechanical Installation
November 2017
for antenna dimensions.
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