Emerson Rosemount 3051 Manual page 70
Pressure transmitter with 4-20 ma hart protocol
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Electrical installation
March 2023
Figure 4-3: Conduit installation diagrams
A. Possible conduit line positions
B. Sealing compound
4.6.2
Power supply for a 4-20 mA HART
The transmitter operates on 10.5–42.4 Vdc at the terminal of the transmitter. The DC
power supply should provide power with less than two percent ripple. Loops with a 250 Ω
resistance require a minimum of 16.6 V.
Note
The transmitter must have a minimum of 250 Ω to communicate with a Field
Communicator. If you are using a single power supply to power more than one Rosemount
3051 Transmitter, make sure the power supply used and the circuitry common to the
transmitters do not have more than 20 Ω of impedance at 1200 Hz.
Figure 4-4: Load limitation
Maximum loop resistance = 43.5 x (power supply voltage - 10.5)
A. Load (Ω)
B. Voltage (VDC)
C. Operating region
The total resistance load is the sum of the resistance of the signal leads and the load
resistance of the controller, indicator, I.S. barriers, and related pieces. If you use intrinsic
safety barriers, include the resistance and voltage drop.
70
00809-0100-4007
®
Rosemount 3051
Manual
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