Emerson Rosemount 644 Reference Manual page 65

Reference Manual
00809-0200-4728
9. Install and tighten the connection head cover. Enclosure covers must be fully
Head mount transmitter with threaded sensor installation
A. Rosemount 644 Transmitter
B. Universal junction box
C. Threaded style sensor
D. Extension
E. Threaded thermowell
Procedure
1. Attach the thermowell to the pipe or process container wall. Install and tighten
2. Attach necessary extension nipples and adapters to the thermowell. Seal the nipple
3. Screw the sensor into the thermowell. Install drain seals if required for severe
4. Verify the transmitter failure mode switch is in the desired position.
5. To verify the correct installation of Integral Transient Protection (option code T1) on
6. Pull the sensor wiring leads through the universal head and transmitter. Mount the
Emerson.com/Rosemount
engaged to meet explosion-proof requirements.
E
thermowells before applying process pressure.
and adapter threads with silicone tape.
environments or to satisfy code requirements.
the device, confirm the following steps have been completed:
a) Ensure the transient protector unit is firmly connected to the transmitter
puck assembly.
b) Ensure the transient protector power leads are adequately secured under the
transmitter power terminal screws.
c) Verify the transient protector's ground wire is secured to the internal ground
screw found within the universal head.
Note
The transient protector requires the use of an enclosure of at least 3.5-in. (89 mm)
in diameter.
transmitter in the universal head by threading the transmitter mounting screws into
the universal head mounting holes.
D
C
Hardware Installation
March 2021
A
B
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