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 and on the

transmitter top label.
An external power supply is required to power a PROFIBUS 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 PROFIBUS 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 644 power terminals are
polarity insensitive for the PROFIBUS protocol.).
3. Tighten the terminal screws. When tightening the sensor and power wires, the
max torque is 6 in.-lbs. (0.7 N-m).
4. Reattach and tighten the cover (if applicable).
4
B
C
D
E
D. Universal head (transmitter inside)
E. Conduit entry
January 2016