Emerson Rosemount 644 Reference Manual page 68

Hardware Installation
March 2021
Rail mount transmitter with threaded sensor
A. Rail mount transmitter
B. Threaded sensor connection head
C. Standard extension
D. Threaded style sensor
E. Threaded thermowell
Procedure
1. Attach the transmitter to a suitable rail or panel.
2. Attach the thermowell to the pipe or process container wall. Install and tighten the
3. Attach necessary extension nipples and adapters. Seal the nipple and adapter
4. Screw the sensor into the thermowell. Install drain seals if required for severe
5. Screw the connection head to the sensor.
6. Attach the sensor lead wires to the connection head terminals.
7. Attach additional sensor lead wires from the connection head to the transmitter.
8. Attach and tighten the connection head cover. Enclosure covers must be fully
9. Set the transmitter failure mode switch.
10. Attach the sensor wires to the transmitter.
68
B
A
thermowell before applying pressure.
threads with thread sealant.
environments or to satisfy code requirements.
engaged to meet explosion-proof requirements.
C
D
Reference Manual
00809-0200-4728
E
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