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Quick Installation Guide
00825-0100-4801, Rev HA
February 2008
Rosemount 3051S
12
STEP 4 CONTINUED...
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 7. Load Limitation
Standard Transmitter
HART Diagnostics Transmitter
(option code DA1)
Maximum Loop Resistance =
43.5 * (Power Supply Voltage – 10.5)
Maximum Loop Resistance =
43.5 * (Power Supply Voltage – 12.0)
The HART communicator requires a minimum loop
resistance of 250Ω for communication.
Voltage (V dc)
Load (Ohms)
Operating
Region
1387
1000
500
0
10.5 20 30
42.4
Voltage (V dc)
Load (Ohms)
Operating
Region
1322
1000
500
0
12.0 20 30
42.4
4801_QIG_RevHA.fm Page 12 Tuesday, February 26, 2008 12:17 PM