Emerson Rosemount 644 Quick Start Manual page 7

April 2021
A. Connection head cover
B. Connection head
C. Thermowell
D. Transmitter mounting screws
E. Integral mount sensor with flying leads
F. Extension
3.1.2 Head mount transmitter with threaded sensor installation (two or
three conduit entries)
WARNING
Enclosure
Enclosure covers must be fully engaged to meet explosion-proof
requirements.
Procedure
1. Attach the thermowell to the pipe or process container wall.
2. Install and tighten thermowells before applying process pressure.
3. Attach necessary extension nipples and adapters to the thermowell.
4. Seal the nipple and adapter threads with silicone tape.
5. Screw the sensor into the thermowell. Install drain seals if required
for severe environments or to satisfy code requirements.
6. Verify the transmitter failure mode switch is in the desired position.
7. Verify the correct installation of Integral Transient Protection (option
code T1).
Quick Start Guide
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.
Quick Start Guide
7