Emerson Guided Wave Radar Level and Interface Transmitters 3300 - Manual (Page 17)

Reference Manual
00809-0100-4811, Rev CA
February 2006
2-5
Rosemount 3300 Series
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 software. Rosemount 3300 Series
transmitters are also compatible with the AMS Suite software which also can
be used for configuration.
For HART communication a minimum load resistance of 250 Ohm within the
loop is required.
Figure 2-4. System architecture.
4-20 mA/HART
Rosemount 751
Field Signal Indicator
Field
Communicator
HART modem
3300 SERIES
RADAR
TRANSMITTER
DCS
Tri-Loop
3 x 4-20 mA
Radar Configuration Tool
or
AMS Suite
Integral
Display
SY
STEM_CA
Note! For HART communication a
minimum load resistance of
250 Ohm within the loop is required.