Rosemount 5402 - Page 22

Reference Manual
00809-0100-4026, Rev FA
July 2009
Rosemount 5400 Series
2-8
Model and Antenna Guide 5402 5401
This table gives guidelines on which
model and antenna to select,
depending on application.
G = Good
AD = Application Dependent (consult
your local Emerson Process
Management representative)
NR = Not Recommended
Cone (preferred) Process Seal Cone (preferred) Rod
Best choice for a broad
range of applications,
free propagation and
pipe installations.
Ideal for small tanks
and corrosive
applications. Also good
for heavy antenna
condensation/build-up.
Suitable for some
extreme process
conditions.
Suitable for small
process connections,
and corrosive
environment.
Accuracy ± 0.1 in. (3 mm) ± 0.1 in. (3 mm) ± 0.4 in. (10 mm) ± 0.4 in. (10 mm)
Tank Considerations
Installation close to smooth tank wall G G G G
Internal obstructions, directly in path NR NR AD AD
Internal obstructions, avoidance
(1)
GGNRNR
Antenna extends below nozzle G G G G
Antenna recessed in smooth nozzle up
to 6 ft (2 m)
GGAD
(2)
NR
(3)
Antenna recessed in nozzle with
irregularities, such as bad welds
AD
(2)
AD AD
(2)
NR
(3)
Still-pipe mounting G G G NR
Valves G G NR NR
Pressure/Temperature considerations See page A-4 See page A-4 See page A-4 See page A-4
Measuring range considerations See page A-1 See page A-1 See page A-1 See page A-1
Process Medium Characteristics
Vapor (light, medium) G G G G
Vapor (heavy) NR AD G G
Condensing vapor/product build-up
(4)
AD G G AD
Boiling/Turbulent surface (low/medium) G G G G
Boiling/Turbulent surface (heavy) AD AD G
(5)
NR
Boiling/Turbulent surface (still-pipe) G G G NR
Foam
(6)
NR NR AD AD
Foam (still-pipe)
(6)
G G G NR
Corrosive products (options available) G
(7)
G
(7)
G
(7)
G
(7)
Materials with very low dielectric G G G AD
Changing density/dielectric/pH/
pressure/temperature
GGGG
Coating/viscous/crystallizing liquids G G G G
Cleanability of antenna AD G AD G
(1) The obstruction should not be within the radar beam. Preferred choices due to more narrow radar beam: Model 5402, and cone antenna.
(2) An extended cone antenna can be used.
(3) The active part must protrude beneath the nozzle.
(4) Build-up can often be avoided or reduced by using heat-tracing or cleaning arrangements.
(5) Use a 6 or 8 in. (150-200 mm) cone antenna.
(6) Foam can either reflect, be invisible, or absorb the radar signal. Pipe mounting is advantageous since it reduces the foaming tendency.
(7) See wetted material on page A-6.