Quick Installation Guide
Rosemount 3051S
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
Maximum Loop Resistance =
43.5 * (Power Supply Voltage – 10.5)
(Ohms) | 1387 |
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1000 |
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Load | 500 |
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| 10.5 | 20 | 30 | ||||
Voltage (V dc) | 42.4 |
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HART Diagnostics Transmitter
(option code DA1)
Maximum Loop Resistance =
43.5 * (Power Supply Voltage – 12.0)
(Ohms) | 1322 |
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1000 |
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Load | 500 |
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| 12.0 | 20 | 30 | |||||
Voltage (V dc) | 42.4 |
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The HART communicator requires a minimum loop
resistance of 250Ω for communication.
12
