June - Emerson Rosemount 644R Quick Start Manual

June 2016

4.2 Typical universal head installation
Head mount transmitter with threaded sensor
1. Attach the thermowell to the pipe or process container wall. Install and
tighten thermowells before applying process pressure.
2. Attach necessary extension nipples and adapters to the thermowell. Seal the
nipple and adapter threads with silicone tape.
3. Screw the sensor into the thermowell. Install drain seals if required for severe
environments or to satisfy code requirements.
4. Verify the transmitter failure mode switch.
5. 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.
6. Mount the transmitter-sensor assembly into the thermowell. Seal adapter
threads with silicone tape.
7. Install conduit for field wiring to the conduit entry of the universal head. Seal
conduit threads with silicone tape.
8. 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.
9. 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
B
C
D
E
D. Universal head (transmitter inside)
E. Conduit entry
Quick Start Guide
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