Quick Installation Guide
00825-0300-4728, Rev AA
July 2010
Rosemount 644
3
S
TEP
1: M
OUNT
THE
T
RANSMITTER
Mount the transmitter at a high point in the conduit run to prevent moisture from draining into
the transmitter housing.
Typical Connection Head Installation
Head Mount Transmitter with DIN Plate Style Sensor
1. Attach the thermowell to the pipe or process container wall. Install and tighten the
thermowell before applying process pressure.
2. Assemble the transmitter to the sensor. Push the transmitter mounting screws through
the sensor mounting plate and insert the snap rings (optional) into the transmitter
mounting screw groove.
3. Wire the sensor to the transmitter (see Step 4:Connect the Wiring).
4. 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. Insert the assembly into the thermowell.
5. Slip the shielded cable though the cable gland.
6. Attach a cable gland into the shielded cable.
7. Insert the shielded cable leads into the connection head through the cable entry.
Connect and tighten the cable gland.
8. Connect the shielded power cable leads to the transmitter power terminals. Avoid
contact with sensor leads and sensor connections.
9. Install and tighten the connection head cover. Enclosure covers must be fully engaged to
meet explosion-proof requirements.
A = 644H Transmitter
D = Transmitter Mounting Screws
B = Connection Head
E = Integral Mount Sensor with Flying Leads
C = Thermowell
F = Extension
A
D
B
C
E
F
4728_Rev AA.fm Page 3 Thursday, July 29, 2010 11:41 AM
