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Quick Installation Guide
00825-0100-4101, Rev EA
June 2010
Rosemount 2051
11
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
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
out
load should be 100 kW or greater.
Maximum Loop Resistance = 43.5 * (Power Supply Voltage – 10.5)
The Field Communicator requires a minimum loop resistance of 250
for communication.
Voltage (V dc)
Load (Ohms)
Operating
Region
1387
1000
500
0
10.5 20 30
42.4
4101_QIG_RevEA.fm Page 11 Tuesday, June 29, 2010 9:26 AM