Emerson Process Management 00809-0700-4530 Radar Detector User Manual


 
27
Reference Manual
00809-0700-4530, Rev AA
Section 2: Installation Considerations
September 2013
Installation considerations
Figure 2-19. Rosemount 5401 with cone antenna
If the signal is dampened by heavy condensation at the antenna, it often helps to insulate the
nozzle. This is to minimize the temperature disparity between the internal and the ambient
temperature.
2.4.3 Probe and antenna selection
In addition to the mounting position, nozzle considerations, and process insulation, there are
other factors that need to be taken into consideration when selecting the probe or antenna.
Probe selection
Single probes are recommended in most applications. The coaxial probes have longer
measuring ranges than the single probes, but are more sensitive to build-up and
coating.
Always ensure that the wetted materials are compatible with the process and that the
probe will withstand the application’s temperature and pressure range.
In case of corrosive tank media, consider using a probe in exotic materials (Alloy C-275
or 400) with protective plate design
(1)
or, alternatively, PTFE-coated probes
(2)
.
PTFE-coated probes can also be used for applications with build-up or condensation.
Build-up on probes can be monitored by the Signal Quality Metrics (Rosemount 5300
Series ). Refer to the Rosemount 5300 Series Product Data Sheet (Document No.
00813-0100-4530) for details.
Antenna selection
Cone antennas are recommended in most applications. Always use the largest possible
antenna.
Always ensure that the wetted materials are compatible with the process and that the
antenna will withstand the application's temperature and pressure range.
In case of corrosive tank media, consider using an antenna in exotic materials (Alloy
C-275 or 400) with protective plate design
(3)
or, alternatively, a process seal antenna.
Process seal antennas can also be used for applications with build-up or condensation.
In case of turbulent surface conditions or foam, consider using a stilling well. For stilling
well installation, refer to the Guidelines for Choosing and Installing Radar in Stilling
Wells and Bypass Pipes Technical Note (Document No. 00840-0300-4024).
Build-up on antennas can often be avoided or reduced by using heat-tracing or cleaning
arrangements, such as purging adapter.
For more information, refer to the Rosemount Level Instrumentation Brochure (Document No.
00803-0100-4161).
(1) Valid for coaxial and single rigid probes.
(2) Valid for rigid and flexible single probes.
(3) Valid for cone antennas.
(L) 0.4 in. (10 mm) or more