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Reference Manual
00809-XXXX-4811, Rev AA
February 2012
2-3
Rosemount 3308
PRELIMINARY
THEORY OF OPERATION
The Rosemount 3308 Wireless Guided Wave Radar Level Transmitter is a
continuous level transmitter that is based on Time Domain Reflectometry
(TDR) principles. Low power nano-second-pulses are guided along a probe
immersed in the process media. When a pulse reaches the surface of the
material it is measuring, 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 from which the total level or interface level is
calculated (see below).
The reflectivity of the product is a key parameter for measurement
performance. A high dielectric constant of the media gives better reflection
and a longer measuring range. A calm surface gives better reflection than a
turbulent surface.
Figure 2-1. Measurement
Principle.
APPLICATION
EXAMPLES
The Rosemount 3308 transmitter is suited for aggregate (total) level
measurements on most liquids, semi-liquids, and liquid/liquid interfaces.
Guided microwave technology offers highest reliability and precision which
ensure measurements are virtually unaffected by temperature, pressure,
vapor gas mixtures, density, turbulence, bubbling/boiling, low level, varying
dielectric media, pH, and viscosity.
Guided wave radar technology in combination with advanced signal
processing make the Rosemount 3308 transmitter suitable for a wide range of
applications.
Time
Reference Pulse
Level
Interface Level
Signal Amplitude
Содержание Rosemount 3308
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