Process Connections - Emerson Rosemount 3300 Series Reference Manual

Reference Manual
00809-0600-4811, Rev AA
February 2009

Process Connections

Upper Null Zone (UNZ)
adjustments may be
needed for 2-in. (50 mm)
nozzles
Avoid nozzles with reducer
(unless using coaxial probe)
Table 2-2. Nozzle
considerations.
Rosemount Radar Level Transmitters
There are a few different types of Process Connections used in these
applications. Below are some directions and guidelines on how to install and
what to consider for the various connections.
Flanged connections
Below are recommendations for the nozzle configuration and dimensions for
flanged installations on top of the tank/vessel.
UNZ
Recommended Nozzle Diameter (D)
Minimum Nozzle Diameter (D)
Maximum Nozzle Height (H)
(1) An Upper Null Zone setup may be required to mask the nozzle, which may reduce
the measuring range.
Nozzle height H is measured from the flange to the bottom of the nozzle,
regardless of how the nozzle is attached to the tank roof as illustrated in
Figure 2-6.
Nozzle diameter (D)
Single (Rigid / Flexible)
4-6 in. (100-150 mm)
(1)
2 in. (50 mm)
4 in. (100 mm) + Nozzle Diameter
H
2-7