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UMSITRPDS3-1 Model 275 Universal Hart Communicator

November 2010

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

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

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 221 222

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Siemens SITRANS P Manuale Utente Pagina 25