Emerson Edition 4 Manuel D’Utilisation

Rosemount Tank Radar REX
Chapter 3 Description of 3900 REX

308014EN, Edition 4

May 2013

The electronics is mounted in an exchangable unit in the explosion proof 
Transmitter Head. A high measurement accuracy is achieved by using 
digital reference circuitry, and by controlling the internal temperature by 
an internal heater. 

The 3900 transmitter head can be used on all types of TRL/2 antennas. 

A metrological seal is available to prevent unauthorized changes of 

database settings.

Some of the electronic cards shown below are optional and may not be 
installed in your transmitter.

1. X12. Intrinsically safe connec-

tion for auxiliary inputs such as 
Slave DAU/RDU, temperature 
sensors and analog inputs.

2. X11. Non-intrinsically safe con-

nection for power, communica-
tion and relays.

3. Electronic unit.

4. Ground connection.

REX3900_TH_Electronics.eps