Process Characteristics; Dielectric Constant; Foam And Turbulence - Emerson Rosemount 5408 Reference Manual

Transmitter Overview
Figure 2-2:
2.2

Process characteristics

2.2.1

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.
2.2.2

Foam and turbulence

Foaming liquids or turbulence may cause weak and varying surface echo amplitudes. The
effects of turbulence are usually minor, but in the most challenging conditions, the
transmitter may be mounted in a still pipe. In addition, measurement performance can be
optimized by configuring the appropriate process conditions settings, see
Process
4
Flowchart of the Signal Processing
Microwave module
Fast Fourier transform
Peak interpolation
Variable calculation
Aout handler
conditions.
A/D coverter
(FFT)
Peak search
Echo tracker
Echo identifier
Distance filtering
LCD handler HART
Reference Manual