HART Tri-Loop HART-to-Analog Signal Converter
B-4
CONNECTIONS AND
HARDWARE
The HART Communicator Model 275 can interface with a transmitter
from the control room, the instrument site, or any wiring termination
point in the loop through the rear connection panel as shown in Figure
B-2. To communicate, connect the HART Communicator in parallel
with the instrument or load resistor. The connections are non-polarized.
FIGURE B-2. Rear Connection Panel
with Optional NiCad Recharger Pack.
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.
Explosions can result in death or serious injury. Do not
make connections to the serial port or NiCad recharger jack
in an explosive atmosphere.
Explosions can result in death or serious injury. Before
connecting the HART Communicator in an explosive
atmosphere, make sure the instruments in the loop are
installed in accordance with intrinsically safe or
nonincendive field wiring practices.
Loop Connection Ports
Serial Port
Optional NiCad
Recharger Jack
275-008AB
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