Emerson Rosemount 644 Reference Manual page 62

Section 3: Hardware installation
April 2015
Field mount transmitter with threaded sensor installation
1.
2.
3.
4.
5.
6.
7.
8.
9.
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Attach the thermowell to the pipe or process container wall. Install and tighten
thermowells before applying process pressure.
Attach necessary extension nipples and adapters to the thermowell.
Seal the nipple and adapter threads with silicone tape.
Screw the sensor into the thermowell. Install drain seals if required for severe
environments or to satisfy code requirements.
Verify the transmitter failure mode switch is in the desired position.
Mount the transmitter-sensor assembly into the thermowell, or remote mount if
desired.
Seal adapter threads with silicone tape.
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.
Install and tighten the covers of two compartments. Enclosure covers must be fully
engaged to meet explosion-proof requirements.
A. 644 Field Mount
B. Field mount housing
C. Threaded style sensor
D. Extension
E. Threaded thermowell
Reference Manual
00809-0200-4728, Rev RA
Hardware Installation