2
Transmitter overview
2.1
Theory of operation
The Rosemount
™
3308 Series is the first true wireless level transmitter that is based on the
Time Domain Reflectometry (TDR) principle. Low power nano-second-pulses are guided
along a probe submerged 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
Figure 2-1: Guided Wave Radar Operating Principle
K
$
%
&
*
+
)
,
(
'
-
A. Reference peak
B. Product surface peak
C. Product level
D. Interface peak
E. Interface level
F. Upper reference point
G. Probe length
H. Tank height
I. Zero reference point
J. Signal amplitude
K. Time
Reference Manual
Transmitter overview
00809-0100-4308
February 2020
Reference Manual
11
Содержание Rosemount 3308A
Страница 8: ...Contents Reference Manual February 2020 00809 0100 4308 viii Rosemount 3308 Series ...
Страница 10: ...Introduction Reference Manual February 2020 00809 0100 4308 10 Rosemount 3308 Series ...
Страница 22: ...Transmitter overview Reference Manual February 2020 00809 0100 4308 22 Rosemount 3308 Series ...
Страница 74: ...Installation Reference Manual February 2020 00809 0100 4308 74 Rosemount 3308 Series ...
Страница 96: ...Configuration Reference Manual February 2020 00809 0100 4308 96 Rosemount 3308 Series ...
Страница 194: ...Product Certifications Reference Manual February 2020 00809 0100 4308 194 Rosemount 3308 Series ...
Страница 222: ...Configuration parameters Reference Manual February 2020 00809 0100 4308 222 Rosemount 3308 Series ...