Emerson Rosemount 644h, Reference Manual

Page: 16 / 78

Reference Manual
00809-0100-4728, Rev HA
December 2002
Models 644H and 644R
2-6
Rail Mount Transmitter and Sensor
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 thermowell, according to plant standards, before
applying pressure.
3. Attach the sensor to the connection head and mount the entire
assembly to the thermowell.
4. Attach and connect sufficient lengths of sensor lead wire from the
connection head to the sensor terminal block.
5. Tighten the connection head cover. Enclosure covers must be fully
engaged to meet explosion-proof requirements.
6. Run sensor lead wires from the sensor assembly to the transmitter.
7. Verify the transmitter failure mode switch.
8. Attach the sensor wires to the transmitter (see Figure 2-8 on
page 2-10).
A = Rail Mount Transmitter
B = Sensor Leads with Cable Glands
C = Integral Mount Sensor with Terminal Block
D = Connection Head
E = Standard Extension
F = Threaded Thermowell
B
C
D
E
F
A
B