Emerson Process Management 2051 Rosemount, Quick Installation Guide, Power Supply for 4-20mA HART

Quick Installation Guide

00825-0100-4101, Rev EA June 2010

Rosemount 2051

Power Supply for 4-20 mA HART

Transmitter operates on 10.5 - 42.4 Vdc. The dc power supply should provide power with less than two percent ripple.

Figure 8. Load Limitation

Maximum Loop Resistance = 43.5 * (Power Supply Voltage – 10.5)

Load (Ohms)

1387

1000

500Operating

Region

0
10.5	20	30

Voltage (V dc) 42.4

The Field Communicator requires a minimum loop resistance of 250Ω for communication.

The total resistance load is the sum of the resistance of the signal leads and the load resistance of the controller, indicator, and related pieces. Note that the resistance of intrinsic safety barriers, if used, must be included.

Power Supply for 1-5 Vdc HART Low Power

Low power transmitters operate on 9–28 Vdc. The dc power supply should provide power with less than two percent ripple. The Vout load should be 100 kW or greater.

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