Wiring Diagrams - Emerson Rosemount 3051S Quick Start Manual

Quick Start Guide
5. If applicable, install wiring with a drip loop. Arrange the drip loop so that the
bottom is lower than the conduit connections on the transmitter housings.
6. Reinstall and tighten the housing covers on both sensors so that metal
contacts metal to meet explosion-proof requirements.
5.2 Rosemount 3051S ERS system with remote display and
interface (Figure 9 and Figure 10)
1. Remove the housing cover labeled "Field Terminals" on both Rosemount
3051S ERS sensors and the remote housing.
2. Using the Rosemount 3051S ERS communication cable (if ordered) or an
equivalent 4-wire shielded assembly per the specifications detailed below,
connect the 1, 2, A, and B terminals between the two sensors and remote
housing in a "tree"
3. Connect the Rosemount 3051S ERS System to the control loop by connecting
the + and - PWR/COMM terminals on the remote housing to the positive and
negative leads, respectively.
4. Plug and seal all unused conduit connections.
5. If applicable, install wiring with a drip loop. Arrange the drip loop so that the
bottom is lower than the conduit connections on the transmitter housings.
6. Reinstall and tighten all housing covers so that metal contacts metal to meet
explosion-proof requirements.

5.3 Wiring diagrams

Figure 8 to Figure 10
Rosemount 3051S ERS System and enable communications with a hand-held
Field Communicator.
Note
The wiring connection between the sensors (and remote housing if applicable) must be
made directly. An intrinsically safe barrier or other high-impedance device will cause the
Rosemount 3051S ERS System to malfunction if placed in between any of the Rosemount
3051S ERS sensors.
5.4 Rosemount 3051S ERS cable specifications
Cable type: Recommend Madison AWM Style 2549 cable. Other comparable
cable may be used as long as it has independent dual twisted shielded pair wires
with an outer shield. The power wires (pin terminals 1 and 2) must be 22 AWG
minimum and the communication wires (pin terminals A and B) must be 24 AWG
minimum.
Cable length: Up to 150 ft (45,7 m) depending upon cable capacitance.
Cable capacitance: The capacitance between the communication terminals (pin
terminals A and B) as wired must be less than 5000 picofarads total. This allows
up to 50 picofarads per ft (0,3 m) for a 100 ft (31 m) cable.
Cable outside diameter (O.D.): 0.270-in. (6,86 mm)
8
(Figure 9) or "daisy-chain"
show the wiring connections necessary to power a
(Figure 10) configuration.
August 2016