Model 8712C/U/H Magnetic Flowmeter Transmitters
A-4
CONNECTIONS AND
HARDWARE
The HART 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 nonincendive field wiring
practices. Explosions can result if connections to the serial port or
NiCad recharger jack are made in an explosive situation. 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 A-2). The connections are non-polarized.
FIGURE A-2. Rear Connection Panel with Optional NiCad Recharger Jack
FIGURE A-3. Connecting the HART Communicator to a Transmitter Loop
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.
See Safety Messages on page A-1 for complete warning information.
Serial Port
275-008AB
Loop Connection Ports
Optional NiCad
Recharger Jack
Power
Supply
Current
Meter
RL≥250V
8712-8712Q11A
Fuse
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