Wire And Apply Power - Emerson Rosemount 644H Quick Start Manual

Quick Start Guide
4. Pull the sensor wiring leads through the universal head and transmitter.
Mount the transmitter in the universal head by threading the transmitter
mounting screws into the universal head mounting holes.
5. Mount the transmitter-sensor assembly into the thermowell. Seal adapter
threads with silicone tape.
6. Install conduit for field wiring to the conduit entry of the universal head. Seal
conduit threads with PTFE tape.
7. Pull the field wiring leads through the conduit into the universal head. Attach
the sensor and power leads to the transmitter. Avoid contact with other
terminals.
8. Install and tighten the universal head cover. Enclosure covers must be fully
engaged to meet explosion-proof requirements.
A
A. Threaded thermowell
B. Standard extension
C. Threaded style sensor

2.0 Wire and apply power

Wiring diagrams are located inside the terminal block cover.
An external power supply is required to power a Fieldbus segment.
The power required across the transmitter power terminals is 9 to 32 VDC (the
power terminals are rated to 32 VDC). To prevent damaging the transmitter, do
not allow terminal voltage to drop below 9 VDC when changing the configuration
parameters.
2.1 Power filter
A Fieldbus segment requires a power conditioner to isolate the power supply filter
and decouple the segment from other segments attached to the same power
supply.
2.2 Power the transmitter
1. Remove the terminal block cover (if applicable).
2. Connect the power lead to the power terminals (The Rosemount 644 with
F
OUNDATION
3. Tighten the terminal screws. When tightening the sensor and power wires, the
max torque is 6 in-lb. (0.7 N-m).
4. Reattach and tighten the cover (if applicable).
4
B
Fieldbus is polarity insensitive.)
D
C
E
D. Universal head (transmitter inside)
E. Conduit entry
September 2016