Emerson Rosemount 2051 Quick Installation Manual page 11

Quick Installation Guide
00825-0100-4101, Rev CA
August 2009
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)
The HART communicator requires a minimum loop resistance of 250
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 V
1387
1000
500
Operating
Region
0
10.5 20
Voltage (V dc)
load should be 100 kW or greater.
out
Rosemount 2051
30
42.4

for communication.
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