47
Reference Manual
00809-0200-4728, Rev SA
Installation
July 2018
Installation
3.4.3 Install the device
Head mount transmitter with DIN plate style sensor installation
1. Attach the thermowell to the pipe or process container wall. Install and tighten the thermowell
before applying process pressure.
2. Verify the transmitter failure mode switch position.
3. Assemble the transmitter to the sensor
(1)
. Push the transmitter mounting screws through the sensor
mounting plate.
4. Wire the sensor to the transmitter (see “Wiring and powering the transmitter” on page 55).
5. Insert the transmitter-sensor assembly into the connection head. Thread the transmitter mounting
screw into the connection head mounting holes. Assemble the extension to the connection head by
tightening the threaded connections of the extension to the housing. Insert the assembly into the
thermowell and tighten the threaded connections.
6. If using a cable gland for power wiring, properly attach the cable gland to a housing conduit entry.
7. Insert the shielded cable leads into the connection head through the conduit entry.
8. Connect the shielded power cable leads to the transmitter power terminals. Avoid contact with
sensor leads and sensor connections. Connect and tighten the cable gland.
9. Install and tighten the connection head cover. Enclosure covers must be fully engaged to meet
explosion-proof requirements.
Head 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. Seal the nipple and adapter
threads with silicone tape.
3. Screw the sensor into the thermowell. Install drain seals if required for severe environments or to
satisfy code requirements.
4. Verify the transmitter failure mode switch is in the desired position.
1, If using a threaded type sensor with a connection head, Reference steps 1-6 below in “Head mount transmitter with threaded sensor installation” on
page 47.
A. Connection head cover
B. Connection head
C. Thermowell
D. Rosemount 644 Transmitter
E. Integral mount sensor with flying leads
F. Extension
A
D
E
F
B
C
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