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Reference Manual
00809-0700-4530, Rev AA
Section 2: Installation Considerations
September 2013
Installation considerations
Rosemount 5400 Series non-contacting radar transmitter
Rosemount 5402 with cone antenna
The antenna can be used in nozzles equal to or larger than 2.2 in (55 mm). It can be recessed in
smooth nozzles up to 6 ft (2 m). However, if the inside of the nozzle contains disturbing objects,
use the extended cone, see Figure 2-17. Make sure the antenna is never the same height as the
nozzle. Because Rosemount 5402 has a high frequency (26 GHz), this generates a narrower
beam width, which can allow for the antenna to recess up in the nozzle. Although, for best
performance, it is recommended that the antenna extend 0.4 in. (10 mm) or more below the
nozzle. Refer to the Rosemount 5400 Series Reference Manual (Document No.
00809-0100-4026) for details.
Figure 2-17. Rosemount 5402 with cone antenna
Rosemount 5402 with process seal antenna
The antenna can be used in 2, 3, and 4 in. (50, 75, and 100 mm) nozzles up to 6 ft (2 m) tall (J),
but disturbing objects inside the nozzle (K) may impact the measurement, and should be
avoided. For best performance, the recommended maximum nozzle height is 19.7 in. (500
mm). The flange on the tank should have a flat or raised face, but other tank flanges may be
possible. Consult your local Emerson Process Management representative for assistance.
Figure 2-18. Rosemount 5402 with process seal antenna
Rosemount 5401 with cone antenna
This antenna can be used in tanks with nozzles equal to or larger than 4 in. (100 mm) and should
extend 0.4 in. (10 mm) or more below the nozzle (L). If required, use the extended cone
solution. The Rosemount 5401 is low frequency (6 GHz), the Rosemount 5402 is high frequency
(26 GHZ), which generates a wider beam width, and thus it should not be recessed up in the
nozzle as this will disrupt the radar beam.
Bad welding
Bad welding
(J)
(K) Bad welding