8
Reference Manual
00809-0100-4026, Rev KC
Introduction
October 2018
Introduction
2.4 Process characteristics
Dielectric constant
A key parameter for measurement performance is reflectivity. A high dielectric constant of the media
provides better reflection and enables a longer measuring range.
Foam
Rosemount 5400 Series Radar Transmitter measurement in foamy applications depends on the foam
properties; light and airy or dense and heavy, high or low dielectrics, etc. If the foam is conductive and
creamy, the transmitter may measure the surface of the foam. If the foam is less conductive, the
microwaves may penetrate the foam and measure the liquid surface.
Turbulence
A calm surface gives better reflection than a turbulent surface. For turbulent applications, the maximum
range of the radar transmitters is reduced. The range depends on the frequency, the antenna size, the
dielectric of the material, and the degree of turbulence. See Table 2-2 on page 11 and Table 2-3 on
page 12 for the expected maximum range with the variables listed.
Temperature/pressure/density and vapor
Temperature, pressure, product density, and vapor generally have no impact on measurements.
Condensation
For applications where heavy condensation and vapors may occur, the low frequency version Rosemount
5401 is recommended.
Tank characteristics
The conditions inside the tank have a significant impact on measurement performance. For more
information see “Vessel characteristics” on page 34.
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