Wire The Device - Emerson Rosemount 3051S Series Reference Manual

Reference Manual
00809-0100-4801, Rev HA
Important
Install the enclosed pipe plug (found in the box) in the unused conduit opening. For straight threads, a
minimum of six threads must be engaged. For tapered threads, install the plug wrench-tight.
For material compatibility considerations, refer to Material Selection
3.6.2

Wire the device

Use twisted pairs to yield best results. To ensure proper communication, use 24 to 14 AWG wire, and do
not exceed 5000 ft. (1500 m).
Note
Determine local wiring and conduit requirements. Understand local wiring and conduit requirements
prior to installation and be sure to follow all regulations during the transmitter's installation.
Figure 3-13. HART Terminal Blocks
To make connections, perform the following procedure:
1. Remove the housing cover on terminal compartment side. Do not remove the cover in explosive
environments when the circuit is live. Signal wiring supplies all power to the transmitter.
2. Connect the positive lead to the terminal marked (+) and the negative lead to the terminal marked
(PWR/COMM–). Avoid contact with leads and terminals. Do not connect powered signal wiring to the
test terminals. Power could damage the test diode.
3. Ensure full contact with Terminal Block screw and washer. When using a direct wiring method, wrap
wire clockwise to ensure it is in place when tightening the terminal block screw.
Note
The use of a pin or ferrule wire terminal is not recommended as the connection may be more susceptible
to loosening over time or under vibration.
4. Plug and seal the unused conduit connection on the transmitter housing to avoid moisture
accumulation in the terminal side. Install wiring with a drip loop. Arrange the drip loop so the bottom
is lower than the conduit connections and the transmitter housing.
Installation
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