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.
for a schematic overview of the signal processing.
Figure 2-2: Flowchart of the Signal Processing
$
%
&
'
(
)
*
,
+
-
A. Microwave module
B. A/D converter
C. Peak search
D. Peak interpolation
E. Echo identifier
F. Distance filtering
G. Variable calculation
H. Aout handler
I. LCD handler
J. HART
®
2.1.1
Reference peak
This peak is caused by the transition between transmitter and the tank vapor space or air.
It is used by the transmitter as a starting reference point for distance to the level surface.
2.1.2
Product surface peak
This peak indicates the product level and is caused by a reflection from the product
surface.
2.1.3
Interface peak
This peak indicates the interface level. The peak is caused by reflection from the interface
between an upper product and a bottom product with a relatively high dielectric constant.
This peak is identified when the measurement mode is set to Product Level and Interface
Level or Interface Level with Submerged Probe.
Transmitter overview
Reference Manual
February 2020
00809-0100-4308
12
Rosemount 3308 Series
Summary of Contents for Rosemount 3308A
Page 8: ...Contents Reference Manual February 2020 00809 0100 4308 viii Rosemount 3308 Series ...
Page 10: ...Introduction Reference Manual February 2020 00809 0100 4308 10 Rosemount 3308 Series ...
Page 22: ...Transmitter overview Reference Manual February 2020 00809 0100 4308 22 Rosemount 3308 Series ...
Page 74: ...Installation Reference Manual February 2020 00809 0100 4308 74 Rosemount 3308 Series ...
Page 96: ...Configuration Reference Manual February 2020 00809 0100 4308 96 Rosemount 3308 Series ...