UMSITRPDS3-1 Model 275 Universal Hart Communicator
November 2005
2-3
+
_
- +
4-20 mA
Current Sense
Resistor 250 to
1100; See Note 3
Controller,
Recorder, or
Other 1-5 Vdc
Device; See
Note 2
Hazardous
Location
Non-Hazardous
Location
See Note 4
See
Note 1
+
_
Range Resistor
250, typical
I
O
I
O
I
O
I
O
I
O
Transmitter
Terminals
See
Note 1
Circuit
Junction
MG00359a
Notes:
1 HART Communicator Connections:
Non-hazardous location – Connect as shown above.
Hazardous location – Refer to Communicator nameplate and the manual supplied with the
Communicator for certifications and approvals before connecting.
The HART Communicator is a non-polar device.
2 The System Power Supply may be part of the host input device or a separate device.
3 Network resistance equals the sum of the barrier resistances and the current sense resistor.
Minimum value is 250; maximum value is 1100.
4 Supply and return barriers are shown. Interconnect all cable shields and ground only at the barriers.
FIGURE 2-2 HART Communicator Connections to a Transmitter Loop
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