Connections - Emerson Rosemount 3300 Series Reference Manual

Reference Manual
00809-0100-4811, Rev AB
July 2003

CONNECTIONS

Figure C-2. Rear connection
panel with Optional NiCad
Recharger Jack
The HART Communicator exchanges information with the 3300 Series
transmitters from the control room, the instrument site, or any wiring
termination point in the loop. The HART Communicator should be connected
in parallel with the transmitter. Use the loop connection ports on the rear panel
of the HART Communicator (see Figure C-2). The connections are
non-polarized.
Do not make connections to the serial port or NiCad recharger pack in an
explosive atmosphere.
Optional NiCad
Recharger Jack
Before connecting the HART Communicator in an explosive atmosphere,
make sure the instruments in the loop are installed in accordance with
intrinsically safe or non-incendive field wiring practices.
NOTE
The HART Communicator needs a minimum of 250 ohms resistance in the
loop to function properly. The HART Communicator does not measure loop
current directly.
NOTE
Loop must be broken to insert the 250 ohm load resistor.
Rosemount 3300 Series
Loop Connection Ports
Serial Port
C-5