Quick Installation Guide
00825-0100-4001, Rev BA
November 2002
Model 3051
Power Supply
The dc power supply should provide power with less than two percent
ripple. 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.
Figure 3. Load Limitation
Maximum Loop Resistance = 43.5 (Power Supply Voltage – 10.5)
The HART communicator requires a
minimum loop resistance of 250Ω.
Voltage (V dc)
Load (Ohms)
Operating
Region
10.5
20
30 40 50
42.4
1935
1500
1000
500
0
4001_RevBA.fm Page 7 Monday, November 25, 2002 2:27 PM
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