
10
Reference Manual
00809-0100-4811, Rev DA
Section 2: Transmitter Overview
January 2015
Transmitter Overview
2.3 System architecture
The Rosemount 3300 Series Radar Transmitter is loop-powered which means it uses the same
two wires for both power supply and output signal. The output is a 4-20 mA analog signal
superimposed with a digital HART
®
signal.
By using the optional HART Tri-Loop
™
, it is possible to convert the HART signal to up to three
additional 4-20 mA analog signals.
With the HART protocol it is possible to use multidrop configuration. In this case
communication is restricted to digital since current is fixed to the 4 mA minimum value.
The transmitter can be connected to display Rosemount 751 Field Signal Indicator or it can be
equipped with an integral display.
The transmitter can easily be configured by using a Field Communicator or a PC with the Radar
Configuration Tool (RCT) software. Rosemount 3300 Series Transmitters are also compatible
with the AMS
®
Suite software which can also be used for configuration.
Figure 2-2. System Architecture
D
C
E
H
B
J
F
G
I
A
Note
For HART communication, a minimum load resistance of 250 within the loop is required.
A Integral display
B Rosemount 3300 Series Radar Transmitter
C Rosemount 751 Field Signal Indicator
D 4-20 mA/HART
E Field Communicator
F Tri-Loop
G 3 x 4-20 mA
H HART modem
I RCT or AMS Suite
J DCS
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