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Rosemount Tank Radar REX
Chapter 11 Electrical Installation of the
11-4
Installation Manual
308014EN, Edition 4
May 2013
11.5 Connecting the Radar Tank Gauge 3900
The RTG 3900 is equipped with two cable outputs for intrinsically safe
and non-intrinsically safe connections. Wires are clearly marked with
numbers and designation of wires is shown on a printed plate at the
cable outputs. The transmitter can also be equipped with an integrated
junction box (JBi).
Figure 11-2. Electrical connections on the RTG 3900 REX.
W11 is for the non-intrinsically safe power supply, the TRL/2 Bus and
relays. The power supply and the TRL/2 Bus can be connected via an
external junction box, or directly to the transmitter if it is equipped with
the Integrated Junction Box. See Chapter 8: Junction Boxes for further
information on how to use the different Junction Boxes. An external
junction box can either be customer supplied or supplied by Emerson
Process Management/Rosemount Tank Gauging as an option.
Wires in the cable output that are not used must be properly insulated
and terminated in the junction box.
W12 is for the intrinsically safe connection of Data Acquisition Unit
(DAU), Display Panel RDU40, analog inputs and temperature sensors.
There are two versions of the W12 cabling: 8 or 15 wires. The 15 wire
version is used when temperature sensors are connected to the
transmitter.
TH3900_Twoversions.eps
Integrated Junction Box (JBi)
W12 Intrinsically safe
connections (EEx i)
W11 Non-Intrinsically
safe connections (EEx e)