Emerson Rosemount 644 with HART Protocol Reference Manual page 57

Reference Manual
00809-0200-4728, Rev SA
Field mount transmitter with threaded sensor installation
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.
3. Seal the nipple and adapter threads with silicone tape.
4. Screw the sensor into the thermowell. Install drain seals if required for severe environments or to
satisfy code requirements.
5. Verify the transmitter failure mode switch is in the desired position.
6. Mount the transmitter-sensor assembly into the thermowell, or remote mount if desired.
7. Seal adapter threads with silicone tape.
8. Pull the field wiring leads through the conduit into the field mount housing. Wire the sensor and
power leads to the transmitter. Avoid contact with other terminals.
9. Install and tighten the covers of two compartments. Enclosure covers must be fully engaged to meet
explosion-proof requirements.
A. Rosemount 644 Field Mount
B. Field mount housing
C. Threaded style sensor
Installation
D. Extension
E. Threaded thermowell
Installation
July 2018
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