Nozzle Requirements - Emerson Rosemount 5408 Reference Manual

Reference Manual
00809-0100-4408, Rev AA
3.2.6

Nozzle requirements

In order to allow the microwaves to propagate undisturbed, the nozzle dimensions should
be kept within the specified limits as given in
Cone antenna
For best performance, the cone antenna should extend at least 0.4 in. (10 mm) below the
nozzle. If required, use the extended cone antenna versions (option code S1 or S2).
However, the antenna can be recessed in smooth nozzles up to 4 ft (1.2 m). Note that if the
inside of the nozzle has irregularities (e.g. due to bad welding, rust or deposit), then use the
extend cone antenna.
Figure 3-4. Mounting of the Cone Antenna
H
Table 3-3. Nozzle Requirements for Cone Antenna, in Inches (Millimeters)
Antenna size
2-in. (DN50)
3-in. (DN80)
4-in. (DN100)
1. The antennas are sized to fit within schedule 80 or lower pipes.
2. The values are valid for cone antennas without antenna extension.
3. The cone antenna can be recessed in smooth nozzles up to 4 ft (1.2 m), but note that the accuracy may be reduced in the
region close to the nozzle. If this is not acceptable, use the extended cone antenna versions (option code S1 or S2).
Mechanical Installation
PRELIMINARY
> 0.4 in. (10 mm)
D
Minimum nozzle
(1)
diameter (D)
1.94 (49.3)
2.80 (71.0)
3.78 (96.0)
Mechanical Installation
Table 3-3 and Table 3-4.
Maximum nozzle height (H)
SST cone SST cone with air purge
ring (code PC1)
November 2016
(2)(3)
13