Emerson Process Management ROSEMOUNT 5300 - Manual (Page 15)

Reference Manual
00809-0100-4530, Rev BA
July 2009
Rosemount 5300 Series
www.rosemount.com
Section 2 Transmitter Overview
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-2
Components of the Transmitter . . . . . . . . . . . . . . . . . . . . page 2-5
System Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-7
Probe Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-9
Process Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-11
Vessel Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-14
Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-15
THEORY OF OPERATION The Rosemount 5300 Series Radar Transmitter is a smart, two-wire
continuous level transmitter based on Time Domain Reflectometry (TDR)
principles. Low power nano-second-pulses are guided along an immersed
probe. When a pulse reaches the surface, part of the energy is reflected back
to the transmitter, and the time difference between the generated and
reflected pulse is converted into a distance, which calculates the total level or
interface level (see below).
The reflectivity of the product is a key parameter for measurement
performance. Media with a high dielectric constant gives better reflection and
a longer measuring range.
Figure 2-1. Measurement
Principle.
Time
Reference Pulse
Level
Interface Level
Signal Amplitude