Rosemount 8712, Reference Manual

Page: 196 / 212

Reference Manual
00809-0100-4664, Rev BA
January 2010
Rosemount 8712
F-2
CONNECTIONS AND
HARDWARE
The HART Field Communicator exchanges information with the transmitter
from the control room, the instrument site, or any wiring termination point in
the loop. Be sure to install the instruments in the loop in accordance with
intrinsically safe or non-incendive field wiring practices. Explosions can result
if connections to the serial port or NiCad recharger jack are made in an
explosive situation. The Handheld Communicator should be connected in
parallel with the transmitter. Use the loop connection ports on the rear panel
of the Handheld Communicator (see Figure F-1). The connections are
non-polarized.
Figure F-1. Rear Connection
Panel
Figure F-2. Connecting the
Handheld Communicator to a
Transmitter Loop
NOTE
The Handheld Communicator needs a minimum of 250 ohms resistance in
the loop to function properly. The Handheld Communicator does not measure
loop current directly.
IRDA Port
Loop Connection Ports
HART Field Communicator Ports
Power
Supply
Current
Meter
RL

250